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EFFICACY AND DISSIPATION OF SELECTIVE INSECTICIDES AGAINST PEST COMPLEX OF LUCERNE (Medicago sativa L.)

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Title EFFICACY AND DISSIPATION OF SELECTIVE INSECTICIDES AGAINST PEST COMPLEX OF LUCERNE (Medicago sativa L.)
 
Creator PREMALATHA, G
 
Contributor CHIRANJEEVI, CH
 
Subject EFFICACY, DISSIPATION, SELECTIVE, INSECTICIDES, PEST, COMPLEX, LUCERNE
 
Description Field experiment was carried out during Rabi, 2011-12 at Student’s Farm, College of
Agriculture, Rajendranagar, Hyderabad wherein the efficacy of six insecticides viz.,
thiacloprid 240 SC at 120 g a.i. ha-1, spirotetramat 240 SC at 120 g a.i. ha-1, imidacloprid
240 SC at 200 g a.i. ha-1, dimethoate 30 EC at 300 g a.i. ha-1, bifenthrin 10 EC at 80 g a.i.
ha-1 and quinalphos 25 EC at 350 g a.i. ha-1 were evaluated against aphids i.e., pea aphid,
Acyrthosiphon pisum Harris, spotted alfalfa aphid Therioaphis trifolii F., and leaf miner,
Agromyza frontella Rondani on lucerne. The dissipation pattern of three effective
treatments viz., spirotetramat 240 SC at 120 g a.i. ha-1, thiacloprid 240 SC at 120 g a.i. ha-1
and imidacloprid 240 SC at 200 g a.i. ha-1 was studied by collecting lucerne samples
including leaves, stem and flowers at 0, 1, 3, 5, 7, 10 and 15 days after spraying,
respectively and analyzed at AINP on Pesticide Residues, Extension Education Institute
premises, Rajendranagar, Hyderabad.
Among the insecticides tested, spirotetramat (120 g a.i. ha-1) was found the best and
effective treatment in controlling pea aphid, A. pisum population with highest overall mean
per cent reduction of 89.28, followed by thiacloprid at 120 g a.i. ha-1 (83.85%) and
imidacloprid at 200 g a.i. ha-1 (82.32%), respectively.
Spirotetramat (120 g a.i. ha-`1) also proved as the best treatment in reducing the
spotted alfalfa aphid, T. trifolii population recording highest overall mean per cent
reduction of 90.70 followed by thiacloprid at 120 g a.i. ha-1 (86.66%) and imidacloprid at
200 g a.i. ha-1 (84.27%).
The overall mean reduction of leaf miner, A. frontella population was more with
spirotetramat at 120 g a.i. ha-1 with highest overall mean reduction of 0.52, followed by
thiacloprid at 120 g a.i. ha-1 (0.67) and imidacloprid 200 g a.i. ha-1 (0.72).
The residues of spirotetramat at 120 g a.i. ha-1 were recorded as 0.55, 0.41, 0.30,
0.17 and 0.03 mg kg-1 at 0, 1, 3, 5, 7 days after spraying, respectively that reached to below
detectable limit (BDL) by 10th day. The half life value (RL50) and the corresponding
waiting period (Ttol) were worked out to be 4.23 and 1.00 day, respectively.
Thiacloprid at 120 g a.i. ha-1 recorded residues of 1.62, 0.74, 0.35, 0.17 and 0.04 mg
kg-1 at 0, 1, 3, 5, and 7 days, respectively showing gradual decrease in the residues and
reached to below detectable limit (BDL) by 10th day after spraying. The half life value was
worked out to be 1.54 days and the waiting period was 7.01 days.
Imidacloprid at 200 g a.i. ha-1 recorded residues of 0.47, 0.30, 0.16, 0.03 mg kg-1 at 0,
1, 3, and 5 days and reached to below detectable limit (BDL) by 7th day after spraying. The
half life value was worked out to be 2.62 days and the waiting period was 1.00 day.
 
Date 2016-06-29T14:09:28Z
2016-06-29T14:09:28Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/68242
 
Language en
 
Relation D9193;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY