Onion insects A Lecture By Allah Dad Khan Provincial Coordinator IPM MINFAL Islamabad
Soybean insects Soybean crop disorders A Lecture By Mr Allah Dad Khan
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Transcript of Soybean insects Soybean crop disorders A Lecture By Mr Allah Dad Khan
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Soybean Crop Insects A Presentation To IPM Course/FFS Participants
ByMr. Allah Dad Khan
Provincial Coordinator IPM KPK For MINFAL Pakistan
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Soybean insectsCrop: SoybeanScientific
Name: Glycine maxFamily: Fabaceae
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Hairy caterpillar: Spilosoma obliquaSymptoms of Damage Larval Scrabbing of damageYoung larvae feed
gregariously on chlorophyll mostly on the under surface of the leaves, due to which the leaves look like brownish-yellow in colour.
In later stages the larvae eat the leaves from the margin.
The leaves of the plant give an appearance of net or web
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Velvetbean caterpillarAnticarsia gemmatalis Hubner
Symptoms of Damage Damaging infestations
occur from late July through September. This pest can develop large populations rapidly and can inflict substantial damage in a short time.
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Green clover wormHypena scabra (Fabricius)
Symptoms of Damage Damaging infestations
occur from late June through September. Populations of green clover worms rarely reach treatable levels by themselves but do contribute to a complex of caterpillars that can cause heavy defoliation.
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Threecornered alfalfa hopperSpissistilus festinus (Say)
Symptoms of damage Damaging infestations occur throughout
the growing season. Threecornered alfalfa hoppers damage soybean plants with their feeding punctures, which girdle the main stem near ground level. Girdling of the main stem can cause lodging, stem breakage and stand reduction. On larger plants, these pests move upward and girdle leaf petioles and feed on the stems that attach the blooms and pods to the plants. Stand reduction of up to 45 percent before R1 does not decrease yield. Lodging can occur later in the season, however, and lodging of 30 percent or more can result in significant yield loss.
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BeetlesSymptoms of DamageDamaging infestations occur
throughout the growing season. Beetles lay eggs in the soil near seedling soybeans. Larvae hatch and feed on soybean roots and nitrogen-fixing nodules. Beetle adults damage soybean leaves by eating rounded holes in the leaves. Infestation during early season occasionally may cause excessive defoliation on seedling beans.
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Redbanded stink bugPiezodorus guildinii (Westwood)
Symptoms of damage Damaging infestations
occur from early July through October. Stink bugs invade fields when pods start to form. Early infestations will be highest on field margins.
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Dusky stink bugEuschistus tristigmus (Say)
Symptoms of Damage Damaging infestations
occur from early July through October. Stink bugs invade fields when pods start to form. Early infestations will be highest on field margins.
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Brown stink bugEuschistus servus (Say)
Symptoms of Damage Damaging infestations
occur from early July through October. Stink bugs invade fields when pods start to form. Early infestations will be highest on field marg
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Green stink bugChinavia hilaris (Say)
Symptoms of DamageDamaging infestations
occur from early July through October. Stink bugs invade fields when pods start to form. Early infestations will be highest on field margins.
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Hairy caterpillar: Spilosoma obliquaIdentification of the pestEggs: Laid in cluster on
the under side of leaves.Larva: Covered with
long yellowish to black hairs
Adult: Medium sized brown moth with a red abdomen
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Gram pod borer: Helicoverpa armigera Symptoms of damage
The young larvae feeds on the chlorophyll of young leaves and skeletonize it.
They feed voraciously on the foliage in early stage, may defoliate the plant and later they feed on flowers and pods.
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Gram pod borer: Helicoverpa armigeraIdentification of the pest LarvaEggs: Spherical in shape
and creamy white in colour, laid singly
Larva: Shows colour variation from greenish to brown. It has dark brown grey lines on the body with lateral white lines and also has dark and pale bands.
Pupa: Brown in colour, occurs in soil, leaf, pod and crop debris
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Gram pod borer: Helicoverpa armigeraPupa Adult
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Tobacco caterpillar:Spodoptera litura
Symptoms of Damage Larva Larvae feed on the
chlorophyll of the leaves.The eaten leaves give
the appearance of whitish yellow web.
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Tobacco caterpillar:Spodoptera litura
Identification of the pest Adult Egg: Egg masses appear
golden brown.Larva: Pale greenish
with dark markings. Gregarious in the early stages
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Thrips: Thrips tabaci Symptoms of damage The infected leaf turns
whitish-brown in colour.In case of heavy
infestation the leaves get dry and drop down and slowly the plant becomes leafless
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White fly: Bemisia tabaciSymptoms of damageDue to attack of the
insect the leaves turn yellow and become curled.
This insect spread the mosaic disease in soybean.
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White fly: Bemisia tabaciIdentification of the pest Nymphs and pupae:
Black and round or oval. Pupae have marginal bristles.
Adults: Small, yellow bodied insects with white wings which are densely covered with a waxy powder
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Soybean Aphid: Aphis spp. Symptoms of damage
They suck the plant sap from the stem, leaves and pods which cause reduction in yield.
The infested leaves are wilted or curled.
Plant stunting, reduced pod and seed counts, puckering and yellowing of leaves.
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Soybean Aphid: Aphis spp. Identification of the pest Aphids under surface of
leavesWinged adults: Have a
black head and thorax.Aphids: Excrete
honeydew on surface of lower leaves.
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Jassids: Apheliona maculosa
Symptoms of damage
Infested leaves start yellowing from the margins.
In case of severe attack, all the leaves become yellow and eventually fall off from the plants
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Identification of the pest
Adults and nymphs:are light green in colour
and suck the sap from leaves and stem.
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Girdle beetle: Oberea (Obereopsis) brevis
Symptoms of damage
Girdling of stems and petioles
The inside of the stem is eaten by the larvae and a tunnel is formed inside the stem.
The leaves of plant of infected portion are unable to get the nutrient and are dried up.
In later stages the plant is cut at about 15 to 25 cm above the ground.
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Girdle beetle: Oberea (Obereopsis) brevisIdentification of the pestLarva: White, soft-
bodied worm with a dark head.
Adult:The freshly emerged adult is yellow, red, brown on the head, thorax and bases of elytra
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Stem Fly: Melanagromyza sojae
Symptoms of damage Infested stem with bore holes
The eggs are laid on leaves. After hatching from the egg
yellowish maggots bore the nearest vein of the leaf.
The maggot then reach the stem through petiole and bore down the stem.
If the infected stem is opened by splitting, distinct zig zag reddish tunnel can be seen with maggot or pupae inside it.
The maggots feed on cortical layers of the stem, may extend to tap root, killing of the plan
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Soybean looperChrysodeixis includens (Walker)
Symptoms of DamagDamaging infestations
occur from early August through September. Soybean loopers usually reach higher populations in areas where cotton and soybeans are grown together.
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