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BIO-EFFICACY AND DISSIPATION OF CERTAIN INSECTICIDES IN CHILLIES

KrishiKosh

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Title BIO-EFFICACY AND DISSIPATION OF CERTAIN INSECTICIDES IN CHILLIES
 
Creator MAHALINGAPPA BOLAJADAR, P
 
Contributor DHARMA REDDY, K
 
Subject BIO-EFFICACY, DISSIPATION, CERTAIN, INSECTICIDES, CHILLIES
 
Description A field experiment on bio-efficacy of insecticides against sucking
pests of chillies was carried out during kharif 2004 at Students’ Farm,
College of Agriculture, Rajendranagar, Hyderabad. Insecticides viz.,
fipronil, profenofos, triazophos, chlorpyriphos, ethion and cypermethrin
were applied at recommended concentrations as foliar sprays at 45 days
after transplanting and thereafter repeated at 15 days interval. A total
of four sprays were given. Pre-treatment count of pest population was
made one day prior to spraying and post treatment counts were taken at
1, 3, 5 and 10 days after each spraying.
Laboratory experiments were conducted to establish dissipation
pattern of selected insecticides viz., triazophos, chlorpyriphos, ethion
and cypermethrin in green chillies at zero hour, 1, 3, 5, 10, 15, 20, 30
days and in shade dried red chillies at 30, 60 and 90 days after fourth
spray. Fruit samples were collected from bio-efficacy trial and analysed
at All India National Project on Pesticide Residues (AINP),
Rajendranagar, Hyderabad.
The results indicated that fipronil 0.01 per cent was the most
effective in controlling thrips population followed by triazophos 0.08 and
profenofos 0.10 per cent. Chlorpyriphos 0.05 per cent was least
effective against thrips.
In respect of mite, profenofos 0.10 per cent was highly effective
followed by triazophos 0.08 and ethion 0.10 per cent. Cypermethrin
0.0012 per cent was least effective.
Highest fruit yield was recorded with fipronil 0.01 per cent with
175.45 per cent increase over untreated check followed by triazophos
0.08, profenofos 0.10, ethion 0.10, cypermethrin 0.0012 and
chlorpyriphos 0.05 per cent.
The initial deposit of triazophos 0.08, chlorpyriphos 0.05, ethion
0.10 and cypermethrin 0.0012 per cent were 0.39, 0.67, 1.84 and 0.16
mg kg-1 which were dissipated to 0.04, 0.07, 0.17 mg kg-1 and below
detectable level (BDL) at 30 days in green chillies and in shade dried red
chillies were dissipated to 0.06, 0.02, 0.35 and 0.01 mg kg-1 at 90 days
after fourth spray, respectively.
The half life values for triazophos, chlorpyriphos, ethion and
cypermethrin were worked out to be 9.70, 9.93, 9.37 and 6.54 days with
waiting periods of 8.03, 21.23, 17.56 and 1.0 day, respectively.
The time required for deposit to dissipate below detectable level
(TBDL) for triazophos, chlorpyriphos, ethion and cypermethrin were
worked out to be 81.61, 97.16, 111.01 and 47.99 days, respectively
 
Date 2016-08-20T15:22:14Z
2016-08-20T15:22:14Z
2005
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/73207
 
Language en
 
Relation D7502;
 
Format application/pdf
 
Publisher ACHARYA N.G.RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD