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Presentation Made By Ehtisham Ali Hussain
University college of agriculture , university of sargodha
4th Semester
Email Address
shamu.hassan.eh@gmail.com
Presentation Made By Ehtisham Ali Hussain
University college of agriculture , university of sargodha
4th Semester
Email Address
shamu.hassan.eh@gmail.com
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Pests of wheat
1. AEN 301 PESTS OF FIELD CROPS AND STORED
PRODUCES AND THEIR MANAGEMENT
PESTS OF WHEAT
2. INTRODUCTION
Wheat is one of the major cereal crops with annual global production
over 600MT from about 200M hectares.
Biotic stresses especially insect pests and disease causes devasting
damage in terms of yield and quality.
On average pest causes 20-37% yield losses in world wide.
5. 1. Wheat Aphid: Macrosiphum miscanthi (Aphididae:
Hemiptera)
Distribution and status: Widely distributed in wheat growing areas.
Host range: Wheat, barley, oats, Cynodon dactylon
Damage symptoms:
Nymphs and adults suck the sap from plants, particularly from their ears.
They appear on young leaves or ears in large numbers during the cold and cloudy
weather.
BINOMICS:
The insects are green, inert, louse like. The nymphs and the females look alike, except
that the latter are larger.
The females give birth to young ones and are capable of reproducing without
mating.
6.
7. ETL: 5 aphids/ear head
Management:
Spray 375 ml of dimethoate 30 EC or oxydemeton methyl 25 EC or
monocrotophos 36SL in 500 L of water per ha.
Since the aphids appear first on the borders of the crop, spray only the infected
strip to check further spread.
8. 2. Armyworm: Mythimna separata (Noctuidae:
Lepidoptera)
Host range: Wheat, sugarcane maize, jowar, bajra.
Damage symptoms:
The freshly emerged larvae spin threads from which they suspend themselves in
the air and then with the help of air currents reach from one plant to another.
In the case of a severe attack, whole leaves, including the mid-rib, are consumed
and the field looks as if grazed by cattle.
The pest may also eat away ears, including the awns and immature grains.
9.
10. Bionomics:
The adult is stout bodied medium sized moth greyish brown in colour.
On the forewings we find 2 white spots prominent veins to the wings.
Freshly emerged larvae are very active, dull white and later turn green.
Pupation : Soil depth of 0.5-5cm or stubble or fresh tillers.
Management:
The pest can be suppressed by collecting and destroying the caterpillars.
Spray 500 ml of dichlorvos 85 SL or 3 kg of carbaryl 50 WP or 1.0 L of
25 EC in 500 L of water per ha.
11. 3. Ghujhia Weevil: Tanymecus indicus (Curculionidae:
Coleoptera)
Distribution and status: Sporadic pest of considerable importance in wheat growing
areas.
Host range: Germinating Rabi crops viz.,Wheat, barley, gram and mustard
Damage symptoms:
Only adults feed on leaves and tender shoots of the host plants.
They cut the germinating seedlings at the ground level.
The damage is particularly serious during October-November when
the rabi crops are germinating
12. Bionomics:
Weevils are earthen grey. Their fore wings are oblong and hind wings are more
less triangular, but they cannot fly.
The pest is active from June to December
Undergoes larval or pupal diapause during rest of the year in the soil. Weevils
emerging in June mature sexually in October.
Young grubs enter the soil.
Management:
Dust carbaryl or malathion 5 D @ 25 kg per ha.
13. 4. Gram Pod Borer: Helicoverpa armigera (Noctuidae:
Lepidoptera)
The gram pod borer attacks wheat at maturity.
It feeds on the grains in the ear heads.
The damage is more where wheat follows cotton.
Binomics:
Adult are medium sized,brownish yellow moth.
A prominent black spots on the fore wings and broad black patch on the outer
margin of hind wings
Management: Spray 3 kg of carbaryl 50 WP or 2.0 L of quinalphos 25 EC in 500 L
of water/ha.
14. 5. Termites: Odontotermes obesus and Microtermes
obesi (Termitidae: Isoptera)
Termites damage the wheat crop soon after sowing and near maturity.
The damaged plants dry up completely and are easily pulled out.
The plants damaged at later stages give rise to white ears.
Binomics:
Egg: Dull kidney shaped and hatches in 30-90 days.
Nymph: Moult 8-9 times and are full grown in 6-12 month.
Adult: Creamy coloured tiny insects resembling ants with dark coloured head
15.
16. Management:
Treat the seed @ 4 ml of chlorpyriphos 20 EC or 7ml of endosulfan 35 EC/kg of
seed.
If the attack is noticed in the standing crop, dilute 2.5 L of endosulfan 35 EC in 5
of water and mix it with 50 kg of soil and broadcast evenly in one hectare,
followed by light irrigation.
17. 6. Molya Nematode / Cyst nematode: Heterodera
avenae (Heteroderidae: Tylenchida)
Distribution and status: Widely distributed in Europe and Australia and has recently
been recorded in Rajasthan, Haryana and the Punjab.
Host range: Wheat, barley, oats and rye
Damage symptoms:
Attacked plants remain stunted and give a shriveled unhealthy appearance.
Presence of nematodes stimulates the formation of branched rootlets.
The main root remains short or bunchy, bearing small galls
18.
19. Bionomics:
This nematode passes unfavourable season in the form of cysts, mostly in the
A cyst consists of the dead body of a female containing a large number of eggs.
The larvae may invade any underground part of a susceptible plant but most of
them enter it at or near the root tips.
It then undergoes the fourth or final moulting and emerges as a full grown
After mating, the eggs mature inside the body of the female and it dies, the
being converted into a cyst.
20. Management
Follow crop rotation with non host crops mustard, pulses, fenugreek or carrot for one
or two years
Grow cyst nematode resistant wheat Raj MR-1 or barley RD 2035 or RD 2052
Plough two to three times during summer
Apply carbofuran @ 45 kg/ha
21. 7. Wheat-gall Nematode: Anguina tritici (Tylenchidae:
Tylenchida)
Distribution and status: Cosmoplitan. It causes ear-cockle or mamni disease. The
nematode is also the carrier of the bacterial yellow slime ear-rot (tundu disease) caused
by Corynebacterium tritici
Host range: Rye, spelt and emer. Oats and barley are immune.
Damage symptoms:
If the black rounded mamni galls are soaked in water overnight, the coat softens and
a large number of larvae are set free.
Affected plants are more or less stunted and their leaves are wrinkled, rolled or
twisted.
The diseased ears are shorter and thicker than the healthy ones and the glumes are
spread farther apart
22.
23. Binomics:
Seed galls are dispersed along with seed during planting and harvest.In moist soil seed galls
release thousands of larvae.
The nematode invades the crown and basal stem area finally penetrating floral primorida they
mature and produce large number of eggs.
Management:
wheat gall nematode can be controlled by separating the galls from the wheat seed by floating
them on water in a tub. The galls, being lighter, float on the surface and may be skimmed off.
seed should then be dried before sowing.
(ii)The pest can also be suppressed by sowing clean seed in uninfested soil. Only one year's
fallowing is sufficient to eradicate this nematode from the fields.
24. Wheat Hessian fly : Mayetiola
destructor(Cecidomylidae:Diptera)
Host plant: wheat, barely and rye.
Damage symptoms:
Stunting a younger plant or tillers due to feeding and to an excreted salivary toxin.
Binomics:
Adult: Dark red body and black wings legs as long or longer than body.
Maggot: Orange red later becoming white with a green stripe along its body