Effect of different management practices against major insect pests of cotton
Loading...
Date
2018
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CCSHAU
Abstract
The present study was conducted at Chaudhary Charan Singh Haryana Agricultural
University, Hisar, Haryana (India). Effect of different management practices such as sowing time,
intercropping, evaluation of ecofriendly practices such as use of neem-based insecticides, release of
Trichogramma chilonis Ishii etc. were studied against major insect-pests of cotton during 2016 and
2017. In both the varieties, HD-432 (desi) and H-1098i (American), the population of sucking insect
pests namely, Amrasca biguttula biguttula Ishida, Thrips tabaci Linderman and Bemisia tabaci
Gennadius and incidence of bollworms namely, Earias species, Helicoverpa armigera Hubner and
Pectinophora gossypiella Saunders was high in late sown cotton as compared to early sown cotton.
During 2016 and 2017, the minimum incidence of bollworms (Earias species and H. armigera,
combined) in green fruiting bodies was recorded in treatment T2 (spinosad 45 SC) (10.09% and 8.10%,
respectively) which was at par with T3 (spinosad 45 SC alternated with nimbecidine 0.03 %
azadirachtin) (10.13% and 9.14%, respectively), T1 (nimbecidine 0.03 % azadirachtin) (12.24% and
10.85%, respectively) and T6 (cotton-sesame intercropping +release of T. chilonis adults alternated
with nimbecidine0.03 % azadirachtin) (10.14% and 8.81%, respectively). During 2016 and 2017, on
green bolls basis, minimum incidence of P. Gossypiella was recorded in T2 (spinosad 45 SC) (2.67%
and 2.00%, respectively) and it was at par with T3 (spinosad 45 SC alternated with nimbecidine 0.03 %
azadirachtin) (3.11% and 2.55%, respectively) and T6 (intercropping cotton-sesame+release of T.
chilonis adults alternated with nimbecidine 0.03 % azadirachtin) (2.89% and 2.53%, respectively).
Intercropping cotton with different crops was found to have significant effect in reducing the
population/incidence of major insect pests in cotton crop. The lowest population of sucking insect pests
was found in cotton intercropped with bajra and sorghum as border crop and highest was in sole
cotton. Lowest incidence of bollworms was found in cotton intercropped with sesame and highest in
sole cotton. Intercropping cotton with crops like sesame, pigeonpea, sorghum and bajra enhanced the
population of natural enemies in cotton crop. The results of the present study may be useful in
managing insect pests in cotton based organic farming systems.
Description
Keywords
null