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STUDIES ON THE PERSISTENCE OF GRANULAR INSECTICIDES IN RELATION TO THE SOIL TYPES WITH REFERENCE TO CONTROL OF BROWN PLANT HOPPER Nilatarvata lugens (Stal)

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Title STUDIES ON THE PERSISTENCE OF GRANULAR INSECTICIDES IN RELATION TO THE SOIL TYPES WITH REFERENCE TO CONTROL OF BROWN PLANT HOPPER Nilatarvata lugens (Stal)
 
Creator SRIDEVI, D
 
Contributor GOUR, T B
 
Subject STUDIES, PERSISTENCE, GRANULAR, INSECTICIDES, RELATION, SOIL, TYPES, REFERENCE, CONTROL, BROWN, PLANT, HOPPER
 
Description Studies were conducted on the persistence of
two granular insecticides (carbofuran 3G and phorate lOG)
in different soil types viz., red sandy loam, black sandy
loam, clay and alkaline sandy clay loam in relation to
the control of brown plant hopper (BPH), Nilaparvata
lugens (Stal) in the Department of Entomology, College of
Agriculture, Rajendranagar, Hyderabad. Bioefficacy
studies involved the release of BPH nymphs on TN-(1)
plants at 1, 5, 10, 15, 20 and 25 days after treatment
(DT) with the two insecticides applied @ 1 kg ai/ha.
Residue analysis of plant, water and soil was also
carried out simultaneously. Mortality of BPH (more than 50 per cent) was
recorded with carbofuran application in red ~nd black
sandy loam till 5 DT while in clay and alkaline, no
appreciable mortality was recorded. However, in phorate
treated soils, mortality was comparitively moderate to
low in red sandy loam and clay soils with no perceptible
mortality in black sandy loam and alkaline soils.
Analysis of total carbofuran residues showed
that in plants at 5 DT, carbofuran was non-detectable
while 3 keto carbofuran was the major metabolite.
Maximum persistence was recorded in plants grown in red
sandy loam while persistence was maximum in water from
alkaline soils. In soils, 3 keto carbofuran was nondetectable
in clay at 0 DT while in the other three soil
types, it was non-detectable ftom 1 DT. Persistence _ of
the chemical in the four soils had less variation (4.7
5.37 days).
Analysis of plant residues for phorate and its
metabolites showed that phorate sulfone constituted the
major fraction. Residues were maximum at 10 DT and
thereafter declined. Maximum persistence was observed in
plants grown in alkaline soil while persistence was
maximum in water from black sandy loam. In soils,
phorate sulfone was higher than phorate from 1 DT in red
sandy loam and 10 DT in the other three soil types.
Carbofuran inherently is more toxic to BPH than phorate
and also its toxicity persis~ for a longer period of
time.
 
Date 2016-08-19T13:36:30Z
2016-08-19T13:36:30Z
1991
 
Type Thesis
 
Identifier ACHARYA N.G.AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD - 500 030
http://krishikosh.egranth.ac.in/handle/1/73017
 
Language en
 
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