SCREENING OF PADDY ADVANCED CULTURES AGAINST BROWN PLANTHOPPER, Nilaparvata lugens (Stal.) (DELPHACIDAE: HOMOPTERA) AND ITS MANAGEMENT WITH NEW INSECTICIDE MOLECULES
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Date
2016
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Acharya N.G. Ranga Agricultural University
Abstract
A field experiment entitled “Screening of Paddy Advanced Cultures
against Brown Planthopper, Nilaparvata lugens (Stal.) and its Management
with New Insecticide Molecules” was conducted at Agricultural College Farm,
Bapatla during kharif 2015. Twenty eight paddy advanced cultures were
screened against brown planthopper, N. lugens and the efficacy of certain new
insecticides were evaluated.
Out of 28 cultures screened for resistance against BPH, four cultures viz.,
BPT 2789, BPT 2703, BPT 2787 and BPT 2688 with 9.11, 9.59, 9.74 and 9.76
mean population per hill respectively were found resistant with a damage score
of three. All other 24 genotypes were rated as moderately resistant with a
damage score of five.
Management of brown planthopper with certain newer insecticides
revealed that all the insecticide treatments were found superior over untreated
control. Amongst them, pymetrozine 50 WG @ 0.5 g l-1, dinotefuran 20 SG @
0.4 g l-1, sulfoxaflor 25 SC @ 0.75 ml l-1 were the most effective insecticide with
62.98, 59.60 and 51.99 per cent population reduction over untreated control
respectively.
Among the insecticides tested for safety on natural enemies, pymetrozine
50 WG @ 0.5 g l-1 proved to be safer to the green mirid bugs with lowest
mortality of 16.96 per cent reduction over precount. The impact of new
insecticide molecules on spiders were also tested, where in sulfoxaflor 25 SC
0.75 ml l-1 recorded lowest mortality of 20.40 per cent followed by pymetrozine
50 WG @ 0.5 g l-1 with 23.89 per cent reduction over precount. As per PD ratio,
pymetrozine 50 WG @ 0.5 g l-1 recorded the highest pest defender ratio.
The grain yield recorded was higher in buprofezin 20 SP @ 1.6 ml l-1
treated plots with 67.98 per cent increase of yield over control followed by
pymetrozine 50 WG @ 0.5 g l-1 (63.81 per cent).
Description
D5271
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