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STUDIES ON COMPATIBILITY OF AVERMECTINS AND CHITIN SYNTHESIS INHIBITORS WITH COMMON FUNGICIDES

KrishiKosh

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Title STUDIES ON COMPATIBILITY OF AVERMECTINS AND CHITIN SYNTHESIS INHIBITORS WITH COMMON FUNGICIDES
 
Creator SHAILA, O
 
Contributor KOTESWARA RAO, S.R
 
Subject STUDIES,COMPATIBILITY, AVERMECTINS, CHITIN, SYNTHESIS, INHIBITORS,COMMON, FUNGICIDES
 
Description Studies on compatibility of avermectins and chitin synthesis inhibitors with
common fungicides were carried out with Spodoptera litura Fabricius and Aspergillus
flavus as test organisms in the Department of Entomology, College of Agriculture,
Rajendranagar, Hyderabad during 2009-2010.
The LC50 of the insecticides viz., abamectin, emamectin benzoate, novaluron and
lufenuron against S.litura was determined as 210.23, 102.12, 350.45 and 453.78 ppm,
respectively, whereas the fungicides viz., mancozeb, chlorthalonil, and carbendazim
recorded LC50 values of 97.0, 1.16 and 40.94 ppm respectively. The test insecticides were
non toxic to A.flavus at LC50, field recommended and other concentrations, whereas
fungicides were also non toxic to S.litura.
Of all the insecticide – fungicide combinations studied on the larval mortality of
S.litura, the combination of emamectin benzoate with carbendazim at their LC50 values
recorded maximum antagonism. Equivalism was observed in the combinations, abamectin
with mancozeb, emamectin benzoate with chlorothalonil, lufenuron with mancozeb and
lufenuron with chlorothalonil at their respective LC50 values. All other combinations
showed varied degrees of synergism and antagonism.
Abamectin LC50 in combination with mancozeb and carbendazim at field
recommended and other concentrations showed synergism. Whereas, in combination with
chlorothalonil, it showed antagonism at field recommended dosage and equivalent effect
at concentration below the field recommended dosage.
Emamectin benzoate LC50 in combination with mancozeb at three different
concentrations showed antagonism. Whereas, with carbendazim resulted no change in the
insecticidal activity when combined with emamectin benzoate showing equivalent effect
at lower concentration.
Novaluron LC50 in combination with fungicides carbendazim antagonism was
observed and chlorothalonil at three test concentrations showed equivalent effect without
any change in insecticidal activity. Whereas, the mancozeb at higher concentration
showed synergism, but no effect at lower concentration.
Chlorothalonil at all the three test concentrations when combined with lufenuron
LC50 resulted in enhanced insecticidal activity indicating synergism. Similar effect was
observed with fungicides carbendazim only at their higher concentrations. All other
combinations resulted in equivalent effect showing no change in the insecticidal activity
of lufenuron.(LC50).
Of all the fungicide – insecticide combinations studied on the inhibition of spore
germination of A.flavus, carbendazim in combination with abamectin at their respective
LC50 values resulted in maximum antagonism. However, rest of the combinations showed
varied degrees of synergism and antagonism.
Mancozeb (LC50), showed antagonism in combination with emamectin benzoate at
all concentrations while with abamectin, novaluron and lufenuron synergism was observed
at field recommended and higher concentrations. Antagonism was observed at lower
concentrations with the three insecticides.
Carbendazim (LC50) showed antagonism in combination with abamectin at all test
concentrations and with lufenuron at concentration higher than field recommendation.
While antagonism was observed with emamectin benzoate and novaluron at all test test
concentrations and with emamectin benzoate only at lower concentration.
Chlorothalonil LC50 showed synergism in combination with abamectin, while
antagonism was recorded with emamectin benzoate and novaluron at all test
concentrations. However, in combination with lufenuron, antagonism was recorded at
lower concentration and synergism at field recommended and higher concentrations.
The wettability and emulsion stability of the insecticides remain unchanged when
mixed with the fungicides. The wettability of the WP formulations of fungicides was not
affected when mixed with any of the insecticides.
All the fungicidal formulations remain unchanged when mixed with insecticides
abamectin, emamectin benzoate, novaluron and lufenuron. WP formulation of fungicide
viz., mancozeb, carbendazim and chlorothalonil altered the emulsion stability of abamectin
on mixing.
All the combinations of test insecticides and fungicides showed no phytotoxic
symptoms on one and half month old groundnut plants at recommended concentrations.
 
Date 2016-08-06T14:05:14Z
2016-08-06T14:05:14Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/71279
 
Language en
 
Relation D8578;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD