PJB-2022-248
EFFECT OF COMMERCIALLY AVAILABLE INSECTICIDES ON SUCKING INSECT PESTS, NATURAL ENEMIES AND POLLINATORS ASSOCIATED WITH (ABELMOSCHUS ESCULENTUS) OKRA CROP
Bilal Ahmad
Abstract
The present research work was carried out at ARI Tarnab during 2021. To evaluate the effect of commercially available insecticides on sucking insect pests, natural enemiesand pollinators in okra crop. The experiment consisted of 7 treatments i.e, thiamethoxam, methomyl, acetamiprid, cypermenthrin+profenofos, bifenthrin, imidachloprid and control experiment was laid in RCB Design replicated 3 times. Treatments were applied twice at 14 days interval. Results revealed that the two sprays application of the tested insecticides showed varying toxicity against the sucking insect pests of okra at 24h, 48h, 72h, 7 days, 10 days and 14 days after each treatments while the population of green lacewings, ladybird beetles and spiders were also significantly affected by these insecticides as compared to control. Among treatments, imidachloprid proved to be the most effective and had minimum pest population followed by thiamethoxam and acetamiprid in both the sprays. Bifenthrin, methomyl and cypermenthrin+ profenofos also produced significant results as compared to control. Methomyl and cypermenthrin+profenofos were found comparatively more hazardous to natural enemies and pollinators population compared to imidachloprid, thiamethoxam, acetamiprid and bifenthrin in two sprays application. Okra yield was highest in plots sprayed with imidachloprid (2 kg/plot) followed by thiamethoxam (1.9 kg/plot), acetamiprid (1.7 kg/plot) and bifenthrin (1.5 kg/plot)while the lowest yield (1.2kg/plot) was recorded in control. Among the tested synthetic insecticides methomyl and cypermenthrin+profenofose were comparatively more hazardous to natural enemies; however imidachloprid, thiamethoxam and acetamiprid were comperativly less hazardous. It is recommended that in case the use of insecticides is unavailable the ones with comparatively less toxicity against natural enemies and pollinators be given preference thus recommended to be incorporated in IPM programs.
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