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BIO-EFFICACY AND RESIDUE DYNAMICS OF INSECTICIDES AGAINST Plutella xylostella (Linnaeus) IN CABBAGE (Brassica oleracea var.capitata)

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Title BIO-EFFICACY AND RESIDUE DYNAMICS OF INSECTICIDES AGAINST Plutella xylostella (Linnaeus) IN CABBAGE (Brassica oleracea var.capitata)
 
Creator ANIL REDDY, ANUGU
 
Contributor SHASHI BHUSHAN, V.
 
Subject insecticides, cabbages, pesticides, plutella xylostella, inorganic acid salts, sampling, fruits, vegetables, land resources, yields
BIO-EFFICACY AND RESIDUE DYNAMICS OF INSECTICIDES AGAINST Plutella xylostella (Linnaeus) IN CABBAGE (Brassica oleracea var.capitata)
 
Description A field experiment was carried out during kharif, 2012 at Student’s Farm, College
of Agriculture, Rajendranagar, Hyderabad wherein the efficacy of seven insecticides viz.,
emamectin benzoate 5 SG at 11 g a.i.ha-1, emamectin benzoate 5 SG at 22 g a.i.ha-1,
profenophos 50 EC at 500 g a.i.ha-1, profenophos 50 EC at 1000 g a.i.ha-1, spinosad 45 SC
at 100 g a.i.ha-1, bifenthrin 10 EC at 100 g a.i.ha-1 and Bacillus thuringiensis at 5 WP at 25
g a.i.ha-1 were evaluated against Plutella xylostella on cabbage.
The dissipation pattern of profenophos 50 EC (1000 g a.i.ha-1) and bifenthrin 10 EC
(100 g a.i.ha-1) was studied collecting samples at regular intervals i.e. 0, 1, 3, 5, 7, 10, 15
and 20 days after last spray and analyzed at AINP on Pesticide Residues, Rajendranagar,
Hyderabad to know the dynamics of degradation.
Another set of cabbage samples collected at regular intervals i.e. 0, 5, 10, 15 and 20
days after last spray and analyzed for profenophos and bifenthrin residues after removing
top three layers to know the effect of pre harvest risk mitigation method and removal of
profenophos and bifenthrin residues by using validated QuEChERS method.
Among all the insecticides, profenophos (1000 g a.i.ha-1) was found to be the most
effective one with a maximum reduction in Plutella xylostella population (70.20%),
followed by bifenthrin 10 EC at 100 g a.i.ha-1 (68.18%).
The initial deposits of 0.99 mg kg-1 profenophos recorded at 2 hours after last spray
dissipated to 0.85, 0.82, 0.16 and 0.07 mg kg-1 by 1, 3, 5 and 7 days after last spray,
respectively and below determination level (BDL) by 10th day. Based on the dissipation
pattern, a safe waiting period of 15 days was recommended taking into consideration of
profenophos MRL (0.01 mg kg-1) given by EU.
The initial deposits of 2.24 mg kg-1 bifenthrin recorded at 2 hours after last spray
dissipated to 1.72, 1.38, 0.82 and 0.23 mg kg-1 by 1, 3, 5 and 7 days after last spray,
respectively and below determination level (BDL) by10th day. Based on the dissipation
pattern a safe waiting period of 2 days was recommended taking into consideration of MRL
(1.0 mg kg-1) given by EU and 3 days was recommended based on the MRL (0.4 mg
kg-1) of CAC.
The data collected on removal of profenophos and bifenthrin residues in cabbage by
removing top three leaves indicate that 91.91 % of profenophos residues and 25.90 % of
bifenthrin residues can be eliminated easily.
 
Date 2016-06-09T12:27:12Z
2016-06-09T12:27:12Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67106
 
Language en
 
Relation ;D9280
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY