SEASONAL INCIDENCE OF INSECT PEST COMPLEX AND BIOEFFICACY OF EMAMECTIN BENZOATE 5%SG AGAINST THE SHOOT AND FRUIT BORER, Earias vittella (Fab.) OF OKRA (Abelmoschus esculentus L.)
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Date
2012
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Indira Gandhi Krishi Vishwavidyalaya, Raipur
Abstract
The present investigation entitled “Seasonal incidence of insect pest complex and bioefficacy of Emamectin benzoate 5%SG against the shoot and fruit borer, Earias vittella (fab.) of okra (Abelmoschus esculentus L.)” was conducted during the Rabi season 2012 at horticulture field, IGKV, Raipur (C.G.). The studies on the seasonal incidence of key pest of okra crop revealed that the occurrence of insect pest complex commenced from 15 days of sowing. Besides the insect pests associated natural enemies were also recorded on the crop. During the course of study, five insect species, viz. jassid A.biguttula biguttula, aphid Aphis gossypii, white fly Bemisia tabaci, red cotton bug Dysdercus koenigii and shoot and fruit borer of okra Earias vittella were noticed causing damage at various growth stages of okra crop. Among these, okra shoot and fruit borer is most important. Among the predator’s lady bird beetles Coccinella septumpunctata, predatory spider and rove beetles, were mainly observed preying on them. Simple correlation studies were carried out to correlate the effects of meteorological variables with these pests revealed that the maximum temperature was significant positive correlated with white fly and jassid .While shoot and fruit borer of okra positively correlated with minimum and maximum temperature and rainfall and negatively correlated with morning and evening relative humidity. The overall fruit damage percentage by shoot and fruit borer was found minimum with the application of Emamectin benzoate 5%SG@13 g a.i./ha ( 25.05%) followed by Emamectin benzoate 5%SG@11 g a.i./ha(27.63%) and maximum with untreated control(52.48%). maximum healthy yield recorded from the treatment(T4) Emamectin benzoate 5%SG@13 g a.i./ha(20.12 kg/ plot i.e.55.89 q/ha) followed by Emamectin benzoate 5%SG@11 g a.i./.ha (18.89 kg/ plot i.e.52.47q/ha), the lowest healthy fruit total yield recorded from untreated control (9.25 kg/ plot i.e.25.69 q/ha).It is evident from natural enemy data that Emamectin benzoate and spinosad were as good as untreated check indicating their safety to coccinellids (grubs and adults), spiders and rove beetle
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