Jute Hairy caterpillar,Jute Semilooper, Jute Stem Weevil/Jute Apion (Pest characters, Nature of Damage and Control Measure)
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| Jute Hairy caterpillar. https://cststudy.blogspot.com |
Jute Hairy caterpillar
Scientific name: Spilarctia oblique.
Family: Arctiidae.
Order: Lepidoptera.
Pest characters
•
It is a polyphagous pest with wide range of host plant
including jute, groundnut, vegetables and ornamental plants.
•
Adults are stout moths having black spotted and
pinkish coloured wings dotted with small blacks spots.
Nature of Damage
1.
It is a serious pest of jute. When jute plant become 23 feet height, they are
attacked by it upto harvesting.
2.
Females lay eggs to the lower surface of the mature leaves. After hatching of
eggs, the young caterpillarss feed on chlorophyllous tissues from lower
surface of leaves.
3.
Affected leaves become membranous. First to third instar caterpillars spread
out to the entire field and feed on whole leaf tissues leaving only the
ribs.
4.
Once caterpillars swarm, there is nothing without stem. They are
polyphagous.
5.
Besides jute they attack soybeans, groundnut, maize, linseed, mashkalai, radish
etc.
Control Measure
A) Nonchemical
1.
Collection and destruction of egg masses and
caterpillars at early stage.
2.
Use of light trap for controlling adults moths.
3.
Ploughing of land after harvesting.
4.
Digging trench surrounding ingested field and killing
them.
5.
Application of biological control.
6.
Spraying of microbial insecticides. e.g. Bacillus
thuringiensis.
B) Chemical
1.
Application of Sevin/ Diazinon/ Diginol 60 EC @ 3 mL/
L of water.
2.
Application of Ripcord/ Cymbush/ Fenon 10 EC @ 1 mL/L
of water.
3.
Application of Azodrin/ Nuvacron 40 WSC @ 3 mL/L of
water.
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| Jute Semilooper. https://cststudy.blogspot.com |
Jute Semilooper
Scientific name: Anomis sabulifera.
Family: Noctuidae.
Order: Lepidoptera.
Pest characters
•
Larvae are called semiloop when cause damage.
•
Body colour green, no hair present.
Nature of damage
1.
Jute Semilooper is a serious pest of jute. Female insects lay eggs singly on
the lower surface of the young leaves.
2.
After hatching of eggs, caterpillar feeds on apical leaves and buds (1st to 9th
leaves).
3.
As a result, plant growth adversely affected and yield greatly reduced.
Control Measure
A) Nonchemical
1.
Brushing the top of the plants with a long rope soaked
in kerosinized water.
2.
Ploughing the infested field after harvesting.
3.
Following suitable crop rotation.
4.
Encouragement of insectivorous birds.
B) Chemical
1.
Application of Sevin/ Diazinon/ Diginol 60 EC @ 3 mL/L
of water.
2.
Application of Ripcord/ Cymbush/ Fenon 10 EC @ 1 mL/L
of water.
3.
Application of Azodrin/ Nuvacron 40 WSC @ 3 mL/L of
water.
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| Jute Stem Weevil/Jute Apion. https://cststudy.blogspot.com/ |
Jute Stem Weevil/Jute Apion
Scientific name: Apion corchori.
Family: Curculionidae.
Order: Coleoptera.
Pest characters
•
Body Covered with hard Elytra.
•
Snout present.
Nature of Damage
It
is a serious pest of jute. It attacks the jute plants from seedling to
harvesting.
1.
Adult female bore into a hole with snout in young seedlings in the apical
portion of the stem. Near the base of petiole female lay eggs in the axial
singly.
2.
After hatching eggs, grubs feed on vascular bundle inside the stem and ultimate
result withering of shoots. This causes a relation of the length of the
Fiber.
3.
Different destruction symptoms may occur depending on the age of plant. If
plants attacked at seedlings stage, they become die.
4.
If the plants are older, as a result of injury a mucilaginous substance
exudates then a hard structure develop. They are known as knot or gira or
chok which prevent rotting of jute.
5.
Adult weevil only bore into the leaves and cannot cause serious damage.
Control Measure
A) Nonchemical
1.
Roughing of infested plants during early crop
season.
2.
Destruction of stubble after harvesting.
3.
Encouragement of olitorious jute cultivation.
B) Chemical
1.
Application of Sevin/ Diazinon/ Diginol 60 EC @ 3 mL/
L of water.
2.
Application of Ripcord/ Cymbush/ Fenon 10 EC @ 1 mL/L
of water.
3.
Application of Azodrin/ Nuvacron 40 WSC @ 3 mL/L of
water.
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