MANAGEMENT OF SUCKING PESTS OF Bt. COTTON.
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Date
2019-07-22
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Dr. Punjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra.
Abstract
The results on the bio-efficacy of pesticides used for sucking pests of Bt cotton shows that the chemical pesticides caused higher per cent reduction, while biopesticides caused moderate to lower per cent reduction.Among the insecticidal treatments, Flonicamid 0.02 per cent, Acetamiprid 0.004 per cent and Imidacloprid 0.008 per cent were found more effective against aphids, jassids, thripsand whiteflies on Bt cotton followed by thiamethoxam 0.005 per cent. Among the biopesticides, Neem oil 2.0 per cent and NSKE 5.0 per cent were found moderate effective and Lecanicilliumlecanii 4g/l found least effective against sucking pests of Bt cotton.
Effect of various insecticides on field population of natural enemies of cotton sucking pests revealed that, the treatment with biopesticidesviz,.Neem oil 2.00 per cent, NSKE 5.0, Lecanicilliumlecanii4g/lwere found safer against Coccinellids, Chrysoperla and Spider predator after their application in the cotton field.
The treatments with chemical pesticides Flonicamid 0.02 per cent, Imidacloprid 0.008 per cent and Acetamiprid 0.004 per cent were found moderately safer against population of natural enemies.While,Thiamethoxam 0.005 per cent was found toxic against Coccinellids,Chrysoperla and spider predator.
The study revealed that, incidence of aphids and whiteflies initiated from 29th MWand its peak incidence was in 39thMW. Incidence of jassidsand thrips initiated 29th MW, respectively and its peak period was in 37th MW.
The correlation analysis results revealed that, incidence of aphids was significant and positively correlated with maximum temperature (0.781**) and minimum temperature (0.614**) and highly significant and negatively correlated with morning humidity(-0.525**) and evening humidity(-0.514**). Jassids correlated significant and positively with maximum temperature (0.583**) and minimum temperature (0.710**).Thrips positive significant with maximum temperature (0.458*) and minimum temperature (750**).Whiteflies positive significant with maximum temperature (0.736**) and minimum temperature (0.596**) and highly significant negatively correlated with morning humidity (-0.497*).
Among the different treatments higher yield of cotton was recorded in plot treated with Flonicamid 0.02 per cent followed by Acetamiprid 0.004 per cent, Imidacloprid 0.008 per cent. Lecanicilliumlecanii 4 g/l gave the lowest yield among the different treatments.
Description
It relates to percent reduction of sucking pests and yield of Bt cotton by an application of botanical and chemical pesticides. Highest percent reduction of sucking pests and yield of cotton crop obtained when plot treated with chemical pesticides.
Keywords
Plant protection, Pesticides, Insecticides, Biopesticides.
Citation
BHARKADE, KU.POOJA SHRIRAM.(2019). Management of sucking pests of Bt. cotton. Department of agricultural entomology,Nagpur. Dr.Panjabrao Deshmukh Krishi Vidyapeeth, Akola. M. Sc. 2019. Print. xiii, 137p. (unpublished).