Studies on survey, seasonal incidence, varietal screening and management of major insect pests of pigeonpea in the northern transitional zone of Karnataka
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Date
2013
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UAS Dharwad
Abstract
Investigation on survey, seasonal incidence, varietal screening and management of
insect pests of pigeonpea in the northern transitional zone of Karnataka was carried out at
MARS, UAS, Dharwad during 2011 to 2013.
The pest spectrum of pigeonpea in the northern transitional zone included 31 insect
pests belonging to orders lepidoptera, hemiptera, coleopteran, diptera, thysanoptera,
hymenoptera and orthroptera. The survey studies revealed that the highest population of
insect pests on pigeonpea was recorded in Haveri followed by Dharwad and lowest in
Belgaum district.
The peak activity of pod borer, Helicoverpa armigera (Hubner) was observed during
48th week (November) for both the years of study. The maximum population of plume moth
was noticed at 47th (November) and 48th week (November) during first and second year. The
influence of different dates of sowing on pest incidence revealed that the early sown
pigeonpea crop (1st week of June, 3rd week of June and 1st week of July) registered lower
incidence of pest and higher grain yield.
The field screening of pigeonpea cultivars for their tolerance to pest damage revealed
that ICP-8863 registered least inflorescence damage by flower webber, Maruca vitrata
(Geyer). The cultivar, BSMR-736 suffered with lesser damage by leaf webber (Grapholita
critica Meyr.) and gram pod borer (H. armigera). The incidence of bud weevil,
Ceuthorhynchus asperulus (Faust), pod bugs (Anoplocnemis phasiana (Fabricius), Riptortus
pedestris (F.) and Clavigralla gibbosa Spinola), plume moth, Exelastis atomosa (May.) and
pod fly, Melanagromyza obtusa (Malloch) was least on cultivar, GC-11-39.
The efficacy of different insecticides tested revealed that indoxacarb 14.5 SC (0.5
ml/l), spinosad 45 SC (0.3 ml/l), emamectin benzoate 5 SG (0.2 g/l) and flubendiamide 480
SC (0.1 ml/l) were highly effective against H. armigera. Among the entomopathogens tested,
HaNPV (250 LE/ha) and Bacillus thuringiensis (2.0 kg/ha) were found superior in
suppressing the population of H. armigera.