Guru GyaanAgroStar Agronomy Centre of Excellence
Leaf eating caterpillars in groundnut crop
Most of the farmers have completed the sowing of groundnut seeds.
In addition to the leaf eating caterpillars, Helicoverpa and leaf miner is also observed in this season.
The incidence of these caterpillars is generally more during early stages of crop.
The infestation of leaf eating caterpillars is much more under high humid conditions.
Young caterpillar scrap the chlorophyll content of the leaves and feed on them, while in later stage defoliate the leaves leaving behind the veins of leaves.
At noon, caterpillars hide in the crack & crevices of the soil near the stem of the plants.
If population is observed during the reproductive stage of the crop, they can also damage to developing pods in soil.
Install pheromone traps.
On initiation of pest, spray neem based formulation @ 20 ml (1% EC) to 40 ml (0.15% EC) or Beauveria bassiana a fungus base powder @ 40 g or Bacillus thuringiensis, a bacterial base powder @ 10 g or SNPV 250 LE @ 10 ml by dissolving in 10 lit of water.
Two sprays of pongamia (karanj oil) oil or ponneem @ 30 ml per 10 lit of water at 15 days interval should be given starting from pest infestation. To prepare ponneem, mix 450 ml of neem oil + 450 ml of pongamia oil (karanj oil) + 100 ml of soap solution (wetting agent) (recommendation of Junagadh Agril. Uni.).
On higher incidence, spray thiamethoxam 12.6% + lambda cyhelothrin 9.5% ZC @ 4 ml or methomyl 40 SP @ 12 g per 10 lit of water.
On infestation of leaf miner, spray deltamethrin 2.8 EC @ 10 ml or lambda cyhelothrin 5 EC @ 5 ml per 10 lit of water.
Control measures taken for leaf eating caterpillars can also control the population of Helicoverpa, if persist.
Source:Agrostar Agronomy Centre of Excellence
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