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Seasonal Incidence of Sucking Pests of Cotton and Insectiside Resistance

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Title Seasonal Incidence of Sucking Pests of Cotton and Insectiside Resistance
 
Creator Phulse V.B.
 
Contributor S.S. Udikeri
 
Subject Agricultural Entomology
 
Description Studies on seasonal incidence of sucking pests in Bt transgenic and desi cottons and
insecticide resistance in sucking pests was carried out at the Department of Agricultural
Entomology, College of Agriculture, Dharwad during 2011-2012. Thrips incidence was
noticed up to first fortnight of October and its peak on MRC-7918 Bt (20.3/3 leaves) at KVK,
from Hanumanmatti followed by MRC-6918 non-Bt on DDhC-11 which recorded least thrips
incidence at ARS, Annigeri. Leafhopper population remained above ETL (2/ leaf) throughout
season except July second and August first weeks. The highest incidence of leafhopper was
on MRC-7918 Bt (7.4/3 leaves) at Hanumanmatti and least on DDhC-11 at Dharwad Farm.
Highest aphid population was recorded on DDhC-11 (26.6/3 leaves) at the end of season at
Annigeri and lowest on RCH-2 non-Bt at Dharwad Farm. Higher predatory coccinellids
activity was noticed from October to December. Spider population was recorded from August
II fortnight till January I fortnight with peak population during November. The mean highest
Chrysoperla zastrovi arabica was 0.7/pl in MRC-7918 Bt at Dharwad and Annigeri.
Similarly, spider activity was higher in MRC-7918 Bt at Annigeri.
Based on changes in LC50 values and comparison with recommended dosages,
resistance in leafhoppers was alarming to neonicotionids. Leafhopper population of
Hanumanamatti acquired 1.05 fold resistance to imidacloprid and 1.09 folds to
thiamethoxam, which was higher than the resistance in Dharwad and Annigeri populations.
The resistance in aphids recorded against imidacloprid was highest with LC50 value of 0.18
ml/l in Hanumanmatti population. Among organophosphates the resistance was highest
against dimethoate (LC50 1.6 ml/l) as revealed by Hanumanamatti population.
 
Date 2016-11-22T13:03:54Z
2016-11-22T13:03:54Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/86937
 
Format application/pdf
 
Publisher UAS, Dharwad