Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810041768
Authors: HARISH KUMAR M. B.
Advisor: Dr. S. B. PATIL
Title: DYNAMICS AND MANAGEMENT OF SUCKING PEST COMPLEX IN Bt COTTON
Publisher: University of Agricultural Sciences, Dharwad
Language: en
Type: Thesis
Agrotags: null
Keywords: DYNAMICS AND MANAGEMENT OF SUCKING PEST COMPLEX IN Bt COTTON
Abstract: Studies on population dynamics, screening of Bt genotypes and efficacy of newer molecules and biorationals against sucking pest complex in Bt cotton were conducted at Agricultural Research Station, Dharwad during Kharif / Rabi 2014. The peak incidence of thrips was noticed during 2nd week of September with a population ranged from 3.20 to 32.70 per three leaves. While, the leafhopper population reached its peak during October 1st week and ranged between 2.20 to 11.80 per three leaves. The aphid population reached its peak during November 2nd week with a population range of 0.20 to 33.00 per three leaves. The peak incidence of mirid bug was coincided with the maximum square formation stage of the crop at 3rd week of October which ranged between 1.90 to 24.40/25 squares. Among the Bt cotton genotypes screened, Kanaka, Shalimar and Mallika shown moderate resistant to leafhopper and aphids. None of the screened of genotypes were found resistant to thrips and mirid bugs but DCH-32 and MRC-6918 were found to be moderately resistant. However, genotypes viz., Bindass, Arjun, Bullet and Chiranjeevi shown moderate susceptibility to sucking pest complex. Flonicamide 50 WG @ 0.3 g/l, Diafenthiuron 50 WP @ 0.5 g/l and Fipronil 5 SC @ 1ml/l were found to be effective insecticides for managing the sucking pests. The highest Benefit Cost of 2.01 was registered in Diafenthiuron 50 WP @ 0.5 g/l followed by 1.96 in Flonicamide 50 WG @ 0.3 g/l. Lowest BC ratio of 1.26 was recorded in Lecanicillium lecanii (1x108 cfu/gm) @ 3 gm/lt.The chemical insecticides tested were found to be safer to natural enemies (Coccinellids, Chrysoperla and spiders) associated with cotton ecosystem during study period. There was no significant variation among the insecticidal treatments with respect to non targets.
Subject: Agricultural Entomology
Theme: DYNAMICS AND MANAGEMENT OF SUCKING PEST COMPLEX IN Bt COTTONg
These Type: M.Sc
Issue Date: 2015-06
Appears in Collections:Thesis

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