Crop Protection :: Pests of Black and Green Gram
Pod bugs: Riptortus pedestris
Clavigralla gibbosa Spin, C. horrens Distant, Riptortus pedestris (F) (Hemiptera: Coreidae) |
Symptoms of damage
- Nymphs and adults suck the sap and cause substantial damage to pods and also to stem, leaves and flower buds.
- Infested pods show pale-yellow patches and dark brown feeding scars on pods.
- Shriveled pods, small seeds are results of severe damage.
Identification of the pest
Riptortus pedestris
Eggs
- Brownish small eggs are glued to the surface of pods or leaves in rows.
- A female will lay about 13 – 186 eggs in batches. Egg period lasts 3 -20 days.
Nymph:
- The newly emerged nymph is delicate, creamy yellowish and later turns greenish-brown.
- It has five instars.
- Nymphal period lasts 11 – 20 days.
Adult:
- Adult is brown.
- C. horrens have spines on either side of the middle of the prothorax The female is bigger than male. Female has a round and swollen abdomen in comparison with a narrow and pointed abdomen of the male.
- In C. gibbosa, abdomen is bulged.
- R. pedestris is brown, slender, quick flying, with lateral yellow lining on sides of body. Hind femur is flat and slightly enlarged in both sexes.
Management:
- Physical collection of bugs in a vessel with water and oil to reduce the population
- Spray any one of the following insecticides
Imidacloprid 17.8 SL @ 40 ml/ac
Thiamethoxam 25% WG @ 40 g/ac
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Riptortuspedestris |
Clavigrallagibbosa |
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