Record Details

Studies on pest complex, their natural enemies and evaluation of modules in bt and non-bt cotton

KrishiKosh

View Archive Info
 
 
Field Value
 
Title Studies on pest complex, their natural enemies and evaluation of modules in bt and non-bt cotton
 
Creator G.R.Bhavya Rani
 
Contributor Shekharappa
 
Subject Agricultural Entamology
 
Description Studies on the survey of pest complex, their natural enemies and evaluation of biointensive
pest management (BIPM) and recommended package of practices (RPP) for Bt and
non-Bt cotton under rainfed condition were undertaken at Main Agricultural Research
Station, University of Agricultural Sciences, Dharwad, Karnataka during 2005-06.
Results indicated that there was no significant difference among Bt and non-Bt cotton
hybrids with regard to sucking pests viz., leafhoppers, thrips, aphids red cotton bugs and
dusky cotton bugs. However, Bt hybrids recorded slightly higher population sucking pests.
MECH-184 Bt and MECH-184 non-Bt hybrids recorded low population of sucking pests.
Similarly, there was no much difference with respect to predatory population and
parasitization, which appeared more or less same in all the hybrids. However, predatory
population and egg parasitization was highest on MECH-184 non-Bt. The bollworms larval
population was significantly less in Bt cotton hybrids as compared to their non-bt versions
and popular hybrid. The effect of Bt gene was much convincing in terms of damage caused to
fruiting bodies, locule damage and flower rossetting. Among the different Bt hybrids the seed
cotton yield was higher in TCH-2 Bt (8.17 q/ha) followed by MECH-184 Bt (6.77 q/ha).
RPP module irrespective of Bt and non-Bt cotton hybrids was significantly superior in
recording lower incidence of leafhoppers, thrips, red cotton bug and ducky cotton bug
population. While, with respect to aphids BIPM with Bt and non-Bt cotton performed better.
Similarly the natural enemy population appeared significantly higher in BIPM treatment
(RCH-2 Bt and RCH-2 non-Bt). As bollworm management is concerned RCH-2 Bt with RPP
and BIPM performed better with regard to bollworm population and their damage. RPP +
RCH-2 Bt recorded highest yield 17.50 q/ha and was followed by BIPM + RCH-2 Bt (15.25
q/ha). Among the modules RPP + RCH-2 Bt was better in registering higher seed cotton yield
and net profit with minimum interventions.
 
Date 2016-09-14T10:30:54Z
2016-09-14T10:30:54Z
2006
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/76574
 
Format application/pdf
 
Publisher UAS, Dharwad