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Semilooper : Autographa nigrisigna

Semilooper : Autographa nigrisigna Symptoms of damage Skeletinization of leaves and the plant becomes whitish The larvae feed on leaf buds, flowers, tender pods and developing seeds. Ragged and irregular pod. (This is in contrast with the neat, and round hole, characteristic of pod borer damage.) Identification of the pest Moths have typically patterned forewings. The larva 25 mm long is green semiloopers.
Management ETL 10% affected parts Deep summer ploughing in 2-3 years to eliminate quiescent pupa. Early sowing, short duration varieties. Avoid closer plant spacing. Grow tall sorghum as comparison crop to serve as biological bird perches Collect and destroy larvae and adults to the extent possible Install pheromone traps at a distance of 50 m @ 5 traps/ha for each insect pest. Install Bird perches @ 50/ha. Setting of light traps (1 light trap/5 acre) to kill moth population. Control is achieved by releasing of Trichogramma chlionis at weekly intervals @1.5 lakh/ha/ week for four times. Conserve green lacewing, predatory stink bugs, spider, ants Application of NPV 250 LE /ha with teepol 0.1% and Jaggery 0.5% thrice at 10 – 15 days interval commencing from flowering stage. (Note: Insecticide / Ha NPV spray should be applied when the larvae are in early stage). Bt @ 600 g, neem oil/ pungum oil 80 EC @ 2ml/lit Spray NSKE 5% twice . Apply any one of insecticides at 25 kg/ha. Chlorpyriphos 1.5 % DP, quinalphos 4D, Spray insecticides like Carbaryl 10%DP.(OR) Quinalphos 25 EC @ 1000 ml/ha

Symptoms of damage

  • Skeletinization of leaves and the plant becomes whitish
  • The larvae feed on leaf buds, flowers, tender pods and developing seeds.
  • Ragged and irregular pod. (This is in contrast with the neat, and round hole, characteristic of pod borer damage.)
  • Moths have typically patterned forewings.
  • The larva 25 mm long is green semiloopers.
  • ETL 10% affected parts
  • Deep summer ploughing in 2-3 years to eliminate quiescent pupa.
  • Early sowing, short duration varieties.
  • Avoid closer plant spacing.
  • Grow tall sorghum as comparison crop to serve as biological bird perches
  • Collect and destroy larvae and adults to the extent possible
  • Install pheromone traps at a distance of 50 m @ 5 traps/ha for each insect pest.
  • Install Bird perches @ 50/ha.
  • Setting of light traps (1 light trap/5 acre) to kill moth population.
  • Control is achieved by releasing of Trichogramma chlionis at weekly intervals @1.5 lakh/ha/ week for four times.
  • Conserve green lacewing, predatory stink bugs, spider, ants
  • Application of NPV 250 LE /ha with teepol 0.1% and Jaggery 0.5% thrice at 10 – 15 days interval commencing from flowering stage. (Note: Insecticide / Ha NPV spray should be applied when the larvae are in early stage).
  • Bt @ 600 g, neem oil/ pungum oil 80 EC @ 2ml/lit
  • Spray NSKE 5% twice .
  • Apply any one of insecticides at 25 kg/ha. Chlorpyriphos 1.5 % DP, quinalphos 4D,
  • Spray insecticides like Carbaryl 10%DP.(OR) Quinalphos 25 EC @ 1000 ml/ha