Studies on insect pest complex of kora (Abelmoschus esculentus (L.) Mornch) and Their Control with Insecticides and Biopesticides
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Date
2013
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Publisher
JNKVV
Abstract
ABSTRACT
Present research work on “Studies on insect pest complex of okra (Abelmoschus esculentus (L.)Moench) and their control with insecticides and biopesticides” was carried out in the experimental fields of Department Of Entomology, Live Stock Farm, Adhartal JNKVV, Jabalpur (M.P.) during Summer season 2013. The experiment was conducted with the following objectives :
1. To study the succession of insect pest complex and their naturals enemies on okra
2. To study the population dynamics of major insects pest of okra.
3. (a) To study the efficacy of insecticides against major insect pest complex of okra
(b) To study the efficacy of biopesticides against major insect pest complex of Okra.
Studies on insect pest complex and their natural enemies revealed that the following insect pests were the major pests which were observed infesting the Okra crop. Three different species of insect pests and one natural enemy were recorded on the okra crop at experimental field of Department Of Entomology, Live Stock Farm, Adhartal, JNKVV, Jabalpur (M.P.) during Summmer season 2013 which represented 3 orders (, Hemiptera, Lepidoptera and Coleoptera) and 4 families (, Cicadellidae, , Aleyrodidae , Noctuidae and Coccinelidae), respectively.
The jassid, appeared when the crop age was 17 days old i.e. from vegetative stage and remained available upto crop maturity stage. The next insect to appear on the crop was whitefly , at 20 days old crop, i.e. from vegetative stage and remained available upto crop maturity stage. Shoot and fruit borer appeared on the crop when the crop age was 59 days and remained available upto reproductive stage of the crop. Lady bird beetle appeared on the crop when the crop age was 29 days and remained available upto reproductive stage of the crop.
The jassid, Amrasca biguttula biguttula (Ishida) was first observed during 12th SW (third week of March). Correlation between various abiotic factors and jassid population showed that maximum and minimum temperature, wind speed , sun shine and evaporation had positive influence while morning and evening relative humidity had a negative influence on the jassid population.
The whitefly, Bemisia tabaci Genn.was first observed during 12th SW (third week of March). Correlation between various abiotic factors and whitefly population showed that morning and evening relative humidity had positive influence while maximum and minimum temperature sun shine and wind speed had a negative influence on the pest population.
The shoot and fruit borer, Earias insulana Fab.was first observed during 18th SW (first week of May). Correlation between various abiotic factors population showed no impact on the fruit infestation.
Spray of insecticides and biopesticides on 55 days old crop (after germination) Emamectin benzoate 5%SG @ 8.5ga.i/ha and Beauveria bassiana 1 l/ha found to be most effective against jassid.
Maximum cost benefit ratio was obtained in each of Pyriproxyfen 10EC (1:7.8), followed by Difenthiuron 50 WP (1:7.4), Emamectin benzoate 5% SG (1:6), Quinalphos 25EC (1:5.2) Pyriproxyfen 10%EC (1:8.26) and Difenthuron 50%WP (1:1.76), Lambda-cyhalothrin 5% EC (1:3.8) and Indoxacarb 14.5 SC (1:2.6) respectively
Maximum cost benefit ratio was obtained in each of Neem soap @ 2.5 kg/ha (1:3.9), followed by Verticillium lecanii @ 1l / ha (1:3.8), Pongamia soap @ 2.5 kg / ha (1:3.4), Beauveria bassiana @ 1l/ha (1:2), Metarhizium anisoplie @ 1l / ha (1:1.4) and Paecilomyces fumosoresus @ 1l / ha (1:1.09), respectively.
It showed that spraying of Neem soap @ 2.5 kg/ha (1:3.9) and Verticillium lecanii @ 1l / ha (1:3.8 on okra crop gave maximum cost benefit ratio.