Study of oilseed crop pests




Дата канвертавання26.04.2016
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STUDY OF OILSEED CROP PESTS


Common name

Scientific name

Order

Family

Nature of damage

Mustard aphid

Lipaphis erysimi

Hemiptera

Aphididae

Adult and nymph suck the cell sap from leaf, shoot and pod.

Mustard sawfly

Alhalia proxima


Hymenoptera

Tenthridinidae

Larvae feed on leaf voraciously

Soybean leaf roller

Lamprosima indica

Lepidoptera

Pyralidae

Caterpillars role into the leaves and feed inside.

Soybean mealy bug

Pseudococcus corymbatus

Hemiptera

Pseudococcidae

Suck cell sap from the leaf.

Soybean caterpillar

Spilosoma obliqua

Lepidoptera

Arctiidae

Caterpillars feed on leaves.

Groundnut moth

Stomopterix nertaria

Lepidoptera

Gelechiidae

Caterpillars feed on leaves.

Til hock moth

Acherontia styx

Lepidoptera

Sphingidae

Caterpillars feed on leaves.

Castor hairy caterpillar

Euproctis lunata

Lepidoptera

Noctuidae

Caterpillars feed on leaves.

Til hawk moth

Acherontia styx

Lepidoptera


Sphingidae

Caterpillars feed on the leaves and defoliate the plant




Mustard aphid

Lipaphis erysimi

F. Aphididae; O. Hemiptera


Nature of damage

It is a serious pest of mustard. Both nymphs and adults suck the cell sap from leaves, stems, inflorescence and developing pods. Incase of severe infestation the leaf becomes curl down and reduced plant growth. Sometimes the infested flower fails to develop pod. If the pods are formed, they do not form healthy and strong seeds.


Control measures

1. Destruction of infested leaves and inflorescence.

2. Raising predatory insects like lady bird beetle.

3. It can be controlled by spraying with

Malathion /Maladan/Malataf 57 EC @ 1l/ha of land.

Sumithion/Edfan/Fenitox 50 EC @ 1l/ha of land.



Mustard sawfly

Alhalia proxima

F. Tenthridinidae; O. Hymenoptera



Nature of damage

It is the most important seeding pest of rapeseed and mustard. The larvae feed voraciously on leaves. Apart from mustard it also attacks radish and allied plants. It feeds during mornings and evenings from the margin of the leaf towards the centre. During day time it prefers to stay in the soil. The grubs cause numerous shot holes and even riddled the entire leaves by voracious feeding. They devour the epidermis of the shoot, resulting in drying up of seedlings and failure to bear seeds in older plants.


Control measure

  • Perching for the bird

  • Early sowing should be done.

  • Maintain clean cultivation.

  • Spraying of Diazinon 60EC or Melathion 57EC @2-3ml/L of water at 15 days interval



Groundnut hairy caterpillar

Spilarctia obliqua

F. Arctiidae; O. Lepidoptera


Nature of damage

It is a serious pest of groundnut. It attacks groundnut plant when the seedling attains 10-15 days age up to the harvesting. Female moths lay eggs in masses on the lower surface of the leaves. After hatching of eggs the young caterpillars remain in the gregarious form 5 to 6 days and feed on leaf chlorophillous tissues on the lower surface. As a result the leaves turn into net like structure. Later on the caterpillars spread out all over the field and start to feed on leaves. Incase of severe infestation they also feed on twig of the plants- As a result reduced plant growth and also reduced yield.



Control measures

1. Collection and destruction of egg masses.

2. Collection and destruction of early stages of larvae.

3. Use of light trap.

4. Ploughing the infested field after harvesting.

5. Spraying with Nogos/DDVP/Aerovap 100EC @500 ml/ha.


Soybean leaf roller

Lamprosima indica

F. Pyralidae; O. Lepidoptera



Nature of damage

The caterpillars are harmful. It is a small yellowish caterpillar that feeds upon the upper leaves of the soybean plants, webbing them together into a small compact within where it lives. The webbed leaves are very conspicuous so that the pest is at once recognizable.



Control measures

1. Destruction of crop residues after harvesting by firing.

2. Spraying with Sumithion/Edfan/Fenitox 50 EC @ 1l/ha of land.

Diazinon/Sevion/Diginol 60EC@ 1.5 l/ha of land.


Til hawk moth

Acherontia styx

F. Sphingidae; O. Lepidoptera



Adult is a giant dark yellowish moth, forewings are dark brown and hind wings are yellowish with 2 black lines. Females lay translucent, greenish, flattened, smooth eggs, usually singly on the host plants. Full brown larvae are stout, sturdy, greenish and 5 cm in length, with a prominent dorsal horn on the 8th abdominal segment. Caterpillars feed on the leaves and defoliate the plant. It remains active through out the crop season.

Control measures

  • Deep ploughing exposes the pupae for predation to insectivorous birds

  • Hand picking collection and destruction of caterpillars.

  • Spraying of Diazinon 60EC or Melathion 57EC @2-3ml/L of water at 15 days interval

Or, application of Chlorpyriphos 20EC @ 2.5 ml/ L of water

Md. Mahbubur Rahman, Assistant Professor, Dept. of Entomology, BAU



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