Showing posts with label Aphids. Show all posts
Showing posts with label Aphids. Show all posts
Army worm, aphid attack: experts warn cotton growers
08:34
Friday, July 19, 2013
Punjab Agriculture Department has warned the growers on Thursday that chances of attack of army worm and aphid on cotton crop have increased due to recent rains. Agricultural experts said that growers can save their crops from damages from these insects by developing their skills to recognise these and knowing the preventive and eradication steps.
Experts also suggest that growers should spray recommended pesticides when attack of these pests reach economic threshold. A spokesman of the provincial agriculture department said that the experts have also recommended to make spray with intervals to eradicate weeds from the water courses.
Source: Business RecorderAphids Biology and Control
02:15Quick Facts...
- Aphids are found on almost all types of plants and a few species can cause plant injury.
- Some aphid species can curl the new leaves of some types of plant.
- Feeding aphids excrete honeydew, a sticky fluid that can cause nuisance problems.
- Natural enemies of aphids include lady beetles, flower fly larvae, lacewing larvae, and parasitic wasps.
- Exposed aphids can be controlled by insecticides, insecticidal soaps and sometimes with a strong jet of water.
By: W.S. Cranshaw
Aphids are the most common insects found on trees,
shrubs, and garden ornamental plants. Over 350 different aphid species
occur in the state but most can feed on only a few species of plants. However,
with so many kinds of aphids, few plants grown in Colorado do not support at
least one aphid. Most species rarely injure plants or even attract attention,
but a few aphid species do cause problems (Table 1).
Figure 1: Adult aphids — winged and wingless.
|
Aphids feed by sucking sap from plants. When the number of
aphids on
a plant are very high for an extended period, their feeding
can cause
wilting and sometimes even dieback of shoots and buds. Some
aphids can cause leaf curling when the insect infests emerging leaves.
Sometimes problems with aphids do not primarily involve plant injury but instead
their production of sticky honeydew. Honeydew is the waste material
excreted by aphids and certain other phloem-sucking insects (e.g., soft
scales, whiteflies, some leafhoppers). It may cover leaves, branches,
sidewalks and anything that lies beneath a infested plant material.
Figure 2: Black cherry aphid colony.
|
Gray sooty mold grows on the honeydew,
further detracting from plant appearance. Ants, yellowjacket wasps, flies, and
bees are usually attracted to plants that are covered with honeydew.
Table 1: Some common aphids associated with trees, shrubs and ornamentals in Colorado. Those marked with an * commonly cause leaf curling distortions in new growth.
Scientific name (Common name) |
Host plant |
Acyrthosiphum pisum (Pea aphid) | Sweet pea, other legumes |
Aphis helianthi (Sunflower aphid) | Red twig dogwood, many flowering plants in summer |
Aphis nerii (Yellow milkweed aphid) | Milkweeds (Asclepias) |
Aphis spiraecola (Spirea aphid) | Spirea |
Aphis viburnicola (Snowball aphid) | Snowball viburnum |
Brachycaudus helichrysi (Leafcurl plum aphid) | Plum |
Caveriella aegopodii (Willow-carrot aphid) | European willows |
Chaitophorus populicola | Populus |
Chaitophorus populifolii | Populus |
Chaitophorus viminalis | Willow |
Cindara spp. (Giant conifer aphids) | Pines, juniper, spruce |
Cryptomyzus ribis (Currant aphid) | Currant |
Dysaphis plantaginea (Rosy apple aphid) | Apple |
Dysaphis tulipae (Tulip bulb aphid) | Dutch iris, tulip |
Eriosoma lanigerum (Woolly apple aphid) | Elm, apple, crabapple |
Eriosoma amiercanum (Woolly elm aphid) | Elm, amelanchier |
Essigella spp. | Pines |
Eulachnus spp. | Pines |
Hyadaphis tataricae (honeysuckle witches’ broom aphid) | Tatarian honeysuckle |
Hyalopterus pruni (Mealy plum aphid) | Prunus |
Macrosiphum rosae (Rose aphid) | Rose |
Macrosiphum euphorbiae (Potato aphid) | Rose, many flowers |
Macrosiphum albifrons (Lupine aphid) | Lupine |
Monellia caryae (American walnut aphid) | Walnut |
Myzocallis tiliae (Linden aphid) | Linden |
Myzocallis alhambra (Western dusky-winged oak aphid) | Bur oak |
Myzocallis ulmifolii (Elm leaf aphid) | Elm |
Myzus ceraki (Black cherry aphid) | Tart Cherry |
Myzus persicae (Green peach aphid) | Peach, apricot, other Prunus |
Nasonovia aquilegiae (Columbine aphid) | Columbine |
Nearctaphis bakeri (Shortbeaked clover aphid) | Hawthorn |
Periphyllus lyropictus (Norway maple aphid) | Norway maple |
Prociphilus franxinifolii (Leafcurl ash aphid) | Green ash |
Pterocomma bicolor | Populus |
Pterocomma smithiae (Black willow aphid) | Willow |
Rhopalosiphum cerasifoliae (Chokecherry aphid) | Chokecherry, pin cherry |
Rhopalosiphum nymphaeae (Water lily aphid) | Prunus, various aquatic plants |
Tuberolachnus salignus (Giant willow aphid) | Willow |
Uroleucon sp. | Many flowers |
Life History and Habits
Aphids are small insects and few exceed 1/8-inch when full grown.
They tend to have an oval body form and a pair of pipe-like cornicles
usually can be seen protruding from the back of the body. Colors are
widely variable among the different aphid species - ranging from very
pale yellow to dark, nearly black. Most have shades of green or orange
and a few species are even bright red. Upon close inspection, many aphids
can be seen to have intricate body patterning.
Some aphids obscure their body by covering themselves with waxy threads.
These are known as “woolly aphids.” Woolly aphids are most commonly
seen associated with pines or other conifers, lining the needles. However,
the woolly apple aphid is a common woolly aphid that clusters
on the limbs of apples and crabapples. Aphids that cluster within leaves
that curl, such as the leafcurl ash aphid, are wax covered as are most
aphids that live on plant roots.
Figure 3: Giant conifer aphids on juniper.
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Figure 4: Leafcurl plum aphid injury.
|
Figure 5: Leafcurling produced by green peach aphid.
|
Colonies of aphids often consist of a mixture of winged and wingless forms.
The great majority of aphids usually develop into the wingless form to remain
and reproduce on the plant. More winged forms tend to be produced when
colonies get overcrowded, plants decline in quality, or environmental cues
favor dispersal to new plants.
Essentially all aphids, regardless of their form, are females. Males,
if they do occur, are present in late summer during only one of the
many generations that are produced during a growing season. The normal
habit of aphids is for a female to give live birth to a genetically
identical daughter aphid through asexual reproduction (parthenogenesis).
The newly born aphid can develop rapidly, typically becoming full-grown
in about 10 to14 days. Adults usually can produce three to five young
per day over the course of their lifetime, which may extend to about
a month but is usually shortened by natural enemy activities.
There is a shift in the life cycle of aphids to handle the challenge
of winter, when plants are not active and cold temperatures would be
lethal. At theFigure 6: Spirea aphid colony. |
Figure 7: Overwintering eggs of rose aphid. |
Figure 8: Pea aphid colony with a syrphid fly larvae (lower left). |
end of the summer, different forms of aphids are produced,
including special sexual form males and females. After mating, a special
egg-producing aphid is produced that lays egg in protected crevices,
often around buds. This egg is the stage that the aphid normally survives winter during
outdoor conditions in Colorado. Eggs hatch the following spring, shortly
after bud break, and the normal life cycle resumes.
Some aphids have even more complicated life cycles that involve
alternating among host plants. With these species, eggs are laid
on a tree or shrub.
Table 2: Some common Colorado aphids that alternate between woody and herbaceous hosts.
Aphid | Overwintering Host | Summer host |
Black cherry aphid | Woolly elm aphid | Wild mustards |
Currant aphid | Currant | Wild mustards |
Green peach aphid | Peach, plum, apricot | Peppers, cabbage, potato, many garden plants |
Leafcurl plum aphid | Plum | Various aster-family plants, clover, vinca, thistle |
Mealy plum aphid | Plum | Cattail, reeds |
Potato aphid | Rose | Potatoes, tomatoes and many other garden plants |
Rosy apple aphid | Apple, pear, mountain-ash | Plantain |
Shortbeaked clover aphid | Hawthorn | Legumes |
Sunflower aphid | Dogwood | Sunflower, yucca, parsley, cilanto, pigweed, many other herbacceous plants |
Water lily aphid | Plum, other Prunus | Water lily and many other aquatic plants |
Willow-carrot aphid | Willow | Carrot, parsley, dill |
Woolly elm aphid | American elm | Amelanchier (roots) |
The best known natural enemies are lady
beetles, with lady beetle larvae being particularly voracious predators
of aphids. Other common aphid predators include the larvae of green
lacewings and flower (syrphid) flies.
Management
Natural Enemies
Figure 9: Winged aphids giving birth on aspen stem. |
Aphids are quite defenseless and there are numerous insects that feed
on them (Fact sheet 5.550, Beneficial
Insects and Other Arthropods). The best known of these natural
enemies are lady beetles, with lady beetle larvae being particularly
voracious predators of aphids. Other common aphid predators include
the larvae of green lacewings and flower (syrphid) flies.
Several species of minute stingless wasps parasitize aphids.
These wasps insert their eggs into the body of the aphid and the
larvae consume it internally. Aphids that have been killed by parasitic
wasps have a conspicuous appearance, turning light brown or black and
becoming bloated. Aphids killed by parasitic wasps are known as “aphid mummies.”Table 3: Insecticides for control of aphids on shade trees and ornamentals.
_______________________________________________________________
Contact Insecticides without Residual Activity
insectical soaps-- pyrethrins
Contact Insecticides with Residual Activity
acephate-- bifenthrin-- beta-cyfluthrin
estenvalerate-- permethrin--lambda-cyhalothrin
estenvalerate-- permethrin--lambda-cyhalothrin
Systemic Insecticides
acephate-- imidacloprid-- dinotefuran
________________________________________________________________
Physical and Cultural Controls
On shrubs and garden plants, aphids can sometimes be managed by simply washing them off of plants with a forceful jet of water. Hosing plants can lethally injure aphids and very few surviving aphids that are knocked to the ground can successfully find their way back onto their host plant.
Some flowers that are perennial, but dieback to the ground
in fall, have problems with aphids in the spring. Columbine,
lupines and perennial asters are examples. With these plants
the eggs of the aphids are laid on the stems in fall, near the
point where new shoots will emerge the following
spring. Spring problems with these aphids can be prevented by removing
the old top growth that contains the eggs before plants emerge in spring.
Figure 10: Tulip bulb aphids. (Parasitic mummy is lower left.)
|
Chemical Controls
Insecticides are a useful means for controlling aphids when natural
enemies are not sufficient (Table 3). Some insecticides act by contact
action and these must contact the body of the aphid to work. This includes
insecticidal soaps (Fact sheet 5.547, Insect
Control: Soaps and Detergents), a popular option for aphid
control but one that requires sprays to cover the aphid during application.
Other insecticides have some persistence on the foliage and may be able
to kill aphids for a day or two if they contact the aphid. Contact insecticides
can be effective against exposed aphids but are ineffective against
species that develop within the protection of leaf curls.
A few insecticides have the ability to move within a plant, spreading in
the sap. These are known as systemic insecticides and they can control aphids
that occur within leaf curls. Some formulations of systemic insecticides are
designed
to be applied as sprays and these are absorbed by leaves and then move in the plant.
Others can be applied to the soil where they are taken up by the roots and translocate
to leaves, particularly young leaves.
Figure 11. Wooly apple aphid colony on crabapple twig.
|
Horticultural oils (Fact sheet 5.569, Insect
Control: Horticultural Oils) have a special place in aphid
control. These act largely by smothering insects and are particularly
effective for control of aphids that spend the winter as eggs on the
tree or shrub, then curl leaves the following spring. They are most
widely used for aphid control on stone fruits (Prunus spp.),
such as peach, apricot, and plum. Horticultural oils are applied before
bud break, during the dormant season.
Source:http://www.ext.colostate.edu
Labels:
Aphids,
Biology,
Control,
Entomology
How to Get Rid of Aphids
23:51
By Colleen Vanderlinden
Insect Name:
Aphids, also known as plant lice.
Description:
Aphids
are roughly 1/10th of an inch long. The most common colors are green
and black, though brown, reddish-brown, and gray aphids inhabit some
parts of the country. They have two long, tubular appendages on the tail
end of their body.
Life Cycle:
Aphid eggs
overwinter attached to plants, then hatch as nymphs in the spring. These
nymphs produce eggs asexually, and produce more nymphs, who grow to
maturity in one week. In the fall, nymphs will lay eggs that contain
some male aphids, who will mate with the nymphs to produce the eggs that
will overwinter and start the next generation of aphids. Mature aphids
lay three to six eggs per day.
Signs of Aphid Infestation:
Aphids
suck the sap out of tender plant shoots and leaves. They suck the sap
in through their beak-like mouths, while injecting leaves with their
saliva. Drinking the sap can weaken the plant, and injecting their
saliva can spread diseases from plant to plant. In addition, aphids
excrete a sticky, clear substance called "honey dew" which commonly
develops sooty mold. Sooty mold is unsightly and interferes with the
plant's ability to photosynthesize.
Effect on Garden Plants:
Aphids can weaken a plant, stunt its growth, cause leaves to curl or wilt, and delay fruit or flower production.
Organic Controls for Aphids:
Sometimes,
a strong blast of water from the hose will knock the aphids off of a
plant and solve the problem. If you attract or purchase certain
beneficials, such as lady bugs, lacewings, parasitic wasps, or damsel
bugs, they will attack the aphids. Plants can also be sprayed with
insecticidal soap, or a homemade tomato leaf or garlic spray to kill and repel aphids.
Labels:
Aphids,
Entomology,
Life Cycle of Aphids,
Organic Control,
Plant Lice
Homemade Organic Aphid Spray
07:14By: Mary Lusk
Aphids
are pesky little critters who usually top a gardener's list of "most
hated" insect pests. The tiny pearly green or milky white insects are
almost impossible to avoid. They love just about all vegetables and
ornamentals. Apple trees, roses and beans are especially susceptible to aphid
attack, and symptoms of aphid infestation include curled leaves, deformed fruit
and honeydew secretions on the plant. Fortunately, aphids can be controlled
well with several cultural practices, and chemical controls are seldom
necessary.
![]() |
Aphids Copyright http://www.agrinfobank.com |
Identifying
Aphids
Once aphids are noticed, act quickly. They don't waste any time multiplying. If left unchecked, they can suck nutrients from plants and spread deadly plant viruses such as mosaic virus.
Natural
Solutions
First, spray the plant with a stream of water to wash the aphids off. Then allow the plant to dry and begin a treatment. A very effective control for aphids is a simple soap spray. Mix 4 ounces (about 3 tablespoons) dishwashing liquid to one gallon of water. Spray the plant, being sure to get under the leaves as well as on the leaf surfaces. The soap spray fades away quickly, so you will need to repeat spraying often.
Soap
sprays usually result in aphid death in about an hour. After an hour, you can
wash the plant with pure water if desired. Washing with water is most desirable
with melons, cucumbers and African violets, which can suffer leaf burn if the
soap spray stays on too long.
Got
too many hot peppers coming in? Hot pepper sprays are also an effective aphid
control. Garlic also works. An easy anti-aphid cocktail combines 3 to 4 hot
peppers, a few cloves of garlic and 1 quart of water. Mix it all in the
blender, then spray on plants.
Another
good cultural practice for aphid control is interplanting your ornamentals with
basil. Aphids are repelled by the smell of the basil. Also, plant angelica and
morning glory to attract ladybugs, a natural predator of aphids. Ladybugs can
be purchased in some garden supply stores or through organic gardening
retailers. Start with about 100 ladybugs per 1,000 square feet of garden space.
Release them in the evening so they can have dew to drink.
The
first defense against aphids is to maintain your own presence in the garden.
Check daily for signs of their moving in. Aphids are tiny with pear-shaped
bodies and two antennae from their forehead. Often, they are accompanied by
ants, which like to feed on the honeydew that aphids secrete. You may notice
the ants before you notice the aphids. Look under the leaves especially.
Source of Article: http://wzus1.life123.com/
Labels:
Aphids,
Entomology,
Organic Control
Aphids--Organic Control
00:33Aphids are soft, pear-shaped, and very tiny (1/16 to 3/8 inch long). Two short tubes project backward from the tip of their abdomen. Aphids have long antennae. Some types of aphids have wings, which are transparent, longer than their body, and held like a roof over their back. Aphids may be green, pink, yellowish, black, or powdery gray. Nymphs resemble adults but are smaller and wingless.
![]() |
Aphid |
Host/Range
Aphids
feed on most fruit and vegetable plants, flowers, ornamentals, and shade trees.
You'll find aphids throughout North America.
Their
life cycle
Aphids
reproduce like there's no tomorrow. Female aphids can reproduce without mating,
giving birth continuously to live nymphs. Nymphs mature in 1 to 2 weeks and
start producing offspring themselves.
When
days become shorter in the fall, both males and females are born. They mate,
and then females lay eggs on stems or in bark crevices. The eggs overwinter and
hatch the following spring. In very mild climates and in greenhouses, aphids
may reproduce year-round.
Damage
Both
adults and nymphs suck plant sap, which usually causes distorted leaves, buds,
branch tips, and flowers. Severely infested leaves and flowers may drop. As
they feed, aphids excrete a sweet, sticky honeydew onto the leaves below. This
allows a sooty mold to grow, which, in addition to being ugly to look at,
blocks light from leaves. Also, some aphids spread viruses as they feed.
Organic
damage control
- Drench plants with strong sprays of water from a garden hose to kill aphids. (A hard, driving rainstorm will have the same effect.)
- Keep your plants as healthy as possible, and spray dormant oil to control overwintering eggs on fruit trees.
- Control ants that guard aphid colonies in trees from predators by placing sticky bands around the trunks.
- Spray aphids with insecticidal soap, summer oil (on tolerant plants), and homemade garlic sprays.
Labels:
Aphids,
Entomology,
Organic Control
Aphid Parasitoids From Punjab Province Of Pakistan
08:50Aphid parasitoids are important bio-control agents, being used in aphid pest management in the field as well as in greenhouses worldwide. Over 400 species of parasitoids are described worldwide and most of them are being used as a basis of integrated pest management (IPM).
In
Pakistan, only 30 species of aphid parasitoids were reported; out of
those 11 species were recorded from Potohar region of Punjab
Province of Pakistan.Keeping in view this low level of basic
research on these important insects, mummified aphids, adult
parasitoids and hyperparasitoids were collected from various
localities of Punjab during 2005-08.A total of 10827 parasitoid
individuals were collected consisting of 30 species in 8 genera
belonging to subfamily Aphidiinae along with 58 new trophic
associations and 184 new locality records. Nine species namely:
Aphidius gifuensis, Aphidius hortensis, Aphidius hieraciorum,
Aphidius phalangomyzi, Aphidius salicis, Aphidius sonchi, Binodoxys
basicurvus, Binodoxys rubicula and Binodoxys angelicae are recorded
for the first time from Pakistan.A species, Trioxys aridunivercena
sp. nov. is described as a new to science record. In addition, a
total of 1257 hyperparasitoid individuals were collected consisting
of 6 species in 6 genera from 3 subfamilies along with 19 new
trophic associations and 51 new locality records. One species,
namely Alloxysta carinata is a new record for Pakistan. Host plants
and primary parasites of A. carinata are new scientific records. Two
species, Phaenoglyphis punjabensis sp. nov. and Dendrocerus rawalena
sp. nov. are new scientific records.
Identification keys for all recorded species have been prepared.Species are illustrated by their valid names, synonyms, measurement of various body parts, tritrophic association, comparison of characters from published descriptions for new records to country and comprehensive characters description for new science specimens has also been provided. The known distribution of all the species is also updated.A map is provided for the distribution of each of them. Biology of most common and voracious parasitoids is given. As Diaeretiella rapae is the most common parasitoid so its general biology including study of various life stages along with some biological parameters like copulation time, pre-mating time, oviposition time and adult longevity have been given.Biological parameters like mummy colouration, position and shape of emergence hole of parasitoids and hyperparasitoids have been given for two aphid species namely,Aphis gossypii and Aphis fabae.Sex ratio of field collected populations of the parasitoid species like Diaeretiella rapae, Aphidius transcaspicus, Aphidius uzbikistanicus, Aphidius avenae, Aphidius smithi and Binodoxys anglicae emerged from the mummies f various species of aphids have been determined and was found female biased.Sex ratio of all recorded parasitoids and hyperparasitoids species are calculated and found to be female biased. A list of trophic associations of host plants, aphids, parasitoids and hyperparasitiods has been provided. Presence and absence of various aphid parasitoids and hyperparasitoids in various localities of Punjab is also tabulated for future reference.
Identification keys for all recorded species have been prepared.Species are illustrated by their valid names, synonyms, measurement of various body parts, tritrophic association, comparison of characters from published descriptions for new records to country and comprehensive characters description for new science specimens has also been provided. The known distribution of all the species is also updated.A map is provided for the distribution of each of them. Biology of most common and voracious parasitoids is given. As Diaeretiella rapae is the most common parasitoid so its general biology including study of various life stages along with some biological parameters like copulation time, pre-mating time, oviposition time and adult longevity have been given.Biological parameters like mummy colouration, position and shape of emergence hole of parasitoids and hyperparasitoids have been given for two aphid species namely,Aphis gossypii and Aphis fabae.Sex ratio of field collected populations of the parasitoid species like Diaeretiella rapae, Aphidius transcaspicus, Aphidius uzbikistanicus, Aphidius avenae, Aphidius smithi and Binodoxys anglicae emerged from the mummies f various species of aphids have been determined and was found female biased.Sex ratio of all recorded parasitoids and hyperparasitoids species are calculated and found to be female biased. A list of trophic associations of host plants, aphids, parasitoids and hyperparasitiods has been provided. Presence and absence of various aphid parasitoids and hyperparasitoids in various localities of Punjab is also tabulated for future reference.
Reference: Bodlah, Imran (2011) "Biosystematics of Aphid Parasitoids from Punjab Province in Pakistan". PhD thesis, University of Arid Agriculture, Rawalpind
Labels:
Aphids,
Entomology,
IMP,
Integrated Pest Management,
Pakistan,
Research
BAP to control Wheat Aphid…. A strategy made through PARB’s project
00:18
By: Maryam Naseer
Wheat is important crop of Pakistan in terms of earning major
foreign exchange and food for people. Wheat is grown at about 8.41 million
hectare in Pakistan, out of which 6.27 million hectare (74%) falls in Punjab
province (MINFAL). Its yield as well as production experienced substantial
fluctuations during some years due to climatic changes. Among others, natural
population of predators and parasitoids fail to manage aphid population to
acceptable limits. Since independence, pest management techniques other than
pesticide spray, such as development of resistant varieties and dependence on
natural enemies of pests were successfully utilized against various pests of
wheat on sustainable basis. Up to 90’s there was a good natural equilibrium
between aphid population and its natural enemies. However, during recent past,
this natural balance seems to be disturbed by extensive and indiscriminate use
of non -selective pesticides on various crops. The wheat aphid attack as compiled
by DG Pest Warning reveals that initially it was seen only in 10 districts till
2002, which increased up to 35 districts from 2004 to onwards.Wheat aphid is
also becoming a potential threat as it started feeding on milky grain stage of
crop when it’s not advisable to spray non selective pesticides on a large scale
as a sole agent for its management. Therefore, we need scientific research to
resolve the issue on permanent basis.
Maryam Naseer (Author)
Agriculture, industry and commerce are pillars of the economy of every country and provide a strong base for development. If we talk about Pakistan, here, agriculture is the only pillar that can boost the dwindling economy and can play a vital role for its development. Many people are associated with agriculture as the main earning source of income and live hood.

If we look at history, the Cotton Leaf Curl Virus (CLCV) was
recorded for the first time during 1967 in Multan. But we did not take it
seriously till it started economic damage in 1988 and until now, we are not succeeded
to control this virus, resultantly losing billions rupees bales annually. Similarly cotton mealy bug was recorded in
Umar kot (Sindh) during 1980 but we did not try to study its lifecycle, weak
links, parasites and predators till 2005 when it caused economic damage to our
cotton crop. So far, we have not been able to find its proper control. So we
need to adopt proactive approach and must be ready with control strategy before
any organism poses serious threat to our agriculture. In fact, we need to remain ahead of pests
rather than following them. We need to learn lesson from our past experience where
we ignored proactive research approach against hidden potential threat.
Wheat aphid is such other emerging problem and few progressive
farmers already started pesticides spray for its control and spray area is
continuously increasing every year (agri. Extension workers). The situation
will further deteriorate if some timely, effective and safe management strategy
other than sole dependence on pesticide spray will not be developed for aphid
control. Furthermore, as mentioned above, wheat is sown on a very large area
and as such it is neither feasible nor economical to manage pests on it through
spray. Therefore we need to develop a
package of Best Agricultural Practices (BAP) including agronomic and bio
control agents to tackle the problem on sustainable basis before it becomes
epidemic.We also need to develop the loss of pesticides comparatively safe for
bio agent and environment but effective against wheat aphid as a second defense
to handle the situation if primary defense fails.
Luckily aphid species attacking Saron( Brassicanapus) are different from that attacking wheat crop,
whereas natural enemies of both groups are the same. Furthermore, aphid appears
on Brassica much earlier than on
wheat crop. This phenomenon may be exploited fully by intercropping Brassica in wheat crop which will help
to develop reservoir of natural enemies of wheat aphid before the appearance of
aphid attack on wheat crop. Consequently, this reservoir may play an important
role in aphid management on wheat crop. The preliminary data on intercropping
of Brassica napus in wheat crop by
Directorate Entomological Research Institute Ayub Agricultural Research
Institute (AARI) Faisalabad, confirmed the aforementioned hypothesis to some
extent.
Wheat aphid can damage crop by making the leave yellow, weak
and affect the quality and production of crop. Aphid also spread various viral diseases,
although not witnessed in Punjab but Peshawar has observed some viral diseases.
Among all aphid types, four are prominent in Punjab province, including, Green
Bug, Corn Leaf Aphid, Bird Cheery Oat aphid and English grain aphid whereas
predators and parasitoids are environment friendly.
Wheat is an important crop and farmers should avoid spray of
pesticides. In order to resolve this issue Centre for Applied Biosciences
International (CABI) with the financial funding of Punjab Agricultural Research
Board (PARB) started to work on a project “Integrated
Pest Management of Aphid in wheat crop” since July 2009. The other
collaborative institutes in the project were Adaptive Research Farm (Bhun,
Sargodha, Gujranwala, Shekhpura and Vehari) and Wheat Research Institute
Faisalabad. The project manager is Dr. Rana Muhammad
Shafiq .
Development of Best Agricultural Practices (BAP) for
management of Aphid attack on wheat has been completed. After analyzing results
of studies the following BAP has been finalized for demonstration phase
·
Timely
sowing of wheat crop up to 20th November
·
Apply
balanced fertilizers i.e N:P:k @ 69:46:25
·
Improved
Brassica/canola intercropping in wheat by the following two methods
1. Three lines of Brassica intercropped
after every 100ft (4 kanals) distance
2. A compact block of one kanal Brassica
intercropped after every 400 ft (2 acres ) distance
If the aphid populations explode due to favorable
environmental conditions, the insecticides, found to be safe for natural
enemies, such as imidacloprid and pymetrozine can be used to control
aphids effectively.
Selection of 10 sites for sowing of wheat to demonstrate BAP has
been identified and completed in six districts of Punjab including, Attock,
Faisalabad, Chiniot, Gujranwala, Khanewal and Bahawalpur. A total of 13 farmer’sday
was arranged against a target of 10 in all districts of Punjab to create
awareness among farmers and agriculture extension workers about BAP. Almost
50-60 farmers participate in the event. Besides this, 5000 brochures containing
BAP information has been prepared and distributed among participants.
The project is just going to be finished with encouraging
results for the safety of wheat crop. Research is only a single way to combat
challenges and problems related to agriculture and other sectors. This project
was a mutual work of a team of scientists, PARB’s monitoring and the support of
Chief Executive PARB Dr. Mubarik Ali. PARB has funded 53 output oriented
research projects in crops, livestock, forestry and fisheries sector under the
Chairmanship of Minister for Agriculture Punjab Malik Ahmed Ali Aulkah. These
all projects will be helpful in boosting our agriculture sector and it is hoped
that Punjab government will fund more project from PARB’s platform in future so
that the emerging problems can get resolve on urgent basis.
Agriculture is our main sector to make us a developed nation
and bring huge foreign exchange for Pakistan. But we have to pay attention to secure
this sector by solving the problemsotherwise many cash crops will suffer from
low productivity, viral diseases and other potential threats.
Maryam Naseer (Author)
About Author:
Maryam Nasser Currently Work as Research Publication Officer at Punjab Agriculture Research Board (PARB), Contact: 042-37232744 ext. 616, Email: rpo@parb.gop.pk
Maryam Nasser Currently Work as Research Publication Officer at Punjab Agriculture Research Board (PARB), Contact: 042-37232744 ext. 616, Email: rpo@parb.gop.pk