INFLUENCE OF PLANTING DENSITIES AND SOWING DATES ON INCIDENCE OF INSECT PESTS OF COTTON IN SCARCE RAINFALL ZONE AND MANAGEMENT WITH NOVEL INSECTICIDES
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Date
2018
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Acharya N.G. Ranga Agricultural University
Abstract
The studies on “Influence of planting densities and sowing dates on
incidence of insect pests of cotton in scarce rainfall zone and management
with novel insecticides” were conducted at Regional Agricultural Research
Station (RARS), Nandyal, Kurnool during kharif, 2017. The incidence of
insect pests of cotton were studied under different dates of sowing and
different plant densities and the efficacy studies of insecticides against major
sucking pests and pink bollworm were under taken.
Under different sowing periods, crop sown during normal sowing (20th
July) recorded more mean leafhopper population of 4.22 leafhoppers per 3
leaves as against delayed sowing (8th August) which recorded 3.87
leafhoppers per 3 leaves. Among varieties and hybrids the lowest mean
leafhopper population of 4.20 leafhoppers per 3 leaves was recorded in
varieties than hybrids which recorded 4.72 mean leafhoppers per 3 leaves.
Under different plant densities the lowest mean leafhopper population
of 2.96 leafhoppers per 3 leaves was recorded in the variety Suraj @ 60×30
cm spacing whereas in hybrids the lowest mean leafhopper population of 2.38
leafhoppers per 3 leaves was recorded RCH 2 Bt BG II @ 90×45 cm spacing.
The insecticide evaluation trial revealed that monocrotophos 36% SL
@ 1.6 ml L-1, flonicamid 50% WDG @ 0.3 g L-1, sulfoxaflor 75% WG @ 1.5
ml L-1 and pymetrozine 50% WG @ 0.4 g L-1 were effective in reducing the
leafhopper population and also recorded higher yields whereas
chlorantraniliprole18.5% EC @ 0.3 ml L-1, chlorpyriphos 20% EC @ 2.5 ml
L-1 and thiodicarb 75% WP @ 1.0 g L-1 were effective in reducing green boll
damage and open boll damage at harvest by pink bollworm and also gave
higher yields.
Description
D5708
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