Screening of germplasms, population dynamics and management of major insect pests infesting greengram
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Date
2020-09
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present investigation was conducted during kharif season of 2019-20 at Norman. E. Borlaug. Crop Research Centre of G.B. Pant University of Agriculture and Technology, Pantnagar (Uttarakhand) and IPM laboratory of Department of Entomology with the objective of screening the germplasm/varieties of greengram in field as well as laboratory conditions, occurrence of major pests and management of major sucking pests associated with greengram. The population studies indicated that a total of 14 insect pests species infest greengram at Pantnagar out of which 6 were major among them. The incidence of Bemisia tabaci, Empoasca kerri, Megalurothrips distalis and Spodoptera litura occurred at early stages of crop growth, continued to build-up and attained their peak population at 36th –37th SMW while, pod bug and pod borer appeared at later stages of growth and reached their peak population at 38th SMW. The maximum and minimum temperature, minimum relative humidity and evaporation had significant positive correlation with whitefly, thrips and jassids
population. Maximum relative humidity showed negative correlation with all the insect pests’ species. Rainfall showed significant positive correlation with thrips population. Wind velocity also showed positive correlation with all the insect pests’ species. Screening of twenty-three germplasm/varieties in both field against Bemisia tabaci, Megalurothrips distalis, Empoasca kerri and defoliator rating (0-5) as well as in laboratory conditions (Leaf disc choice test with standard host castor and Pant Mung 5) against Spodoptera litura showed that germplasm PM 1522 and IPM 02-3 were superior among the other germplasm. The experiment was laid out in a randomized block design with three replications and nine treatments against Bemisia tabaci, Megalurothrips distalis, Empoasca kerri. The study revealed that seed treatment with imidacloprid 600 FS + pyriproxyfen 10 EC was more effective followed by seed treatment with imidacloprid 600 FS + spiromesifen 240 SC than other treatments against major sucking pests.