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RESIDUES OF METHOMYL IN RAPE PLANT AND SEED FOLLOWING ITS APPLICATION FOR THE CONTROL OF BERTHA ARMYWORM, MAMESTRA CONFIGURATA (LEPIDOPTERA: NOCTUIDAE)1

Published online by Cambridge University Press:  31 May 2012

Y. W. Lee ,
R. J. Ford ,
H. McDonald ,
K. S. McKinlay ,
L. G. Putnam  and
J. G. Saha
Y. W. Lee
Affiliation:
Research Station, Canada Agriculture, Saskatoon, Saskatchewan
R. J. Ford
Affiliation:
Research Station, Canada Agriculture, Saskatoon, Saskatchewan
H. McDonald
Affiliation:
Research Station, Canada Agriculture, Saskatoon, Saskatchewan
K. S. McKinlay
Affiliation:
Research Station, Canada Agriculture, Saskatoon, Saskatchewan
L. G. Putnam
Affiliation:
Research Station, Canada Agriculture, Saskatoon, Saskatchewan
J. G. Saha
Affiliation:
Research Station, Canada Agriculture, Saskatoon, Saskatchewan
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Abstract

Residues of methomyl in rape plants and seed were determined after its application for bertha armyworm control. In one experiment application of 3 oz of methomyl per acre left 17 p.p.m. residue on the rape plants immediately after application. This level rapidly declined to 1.5, 1.0, 0.4, and 0.2 p.p.m. 1, 2, 5, and 9 days later, respectively, and no residue was detected (less than 0.02 p.p.m.) in seed harvested 22 days after application of the toxicant. Rape plant samples collected from several farms immediately after the application of 3 to 4 oz of methomyl per acre had 2.5 to 16 p.p.m. residues, indicating inefficient application of the insecticide in some cases. Analysis of rape seed samples collected from 36 farms showed little residue in three samples (0.02 to 0.03 p.p.m.) and none in 33, indicating that the use of methomyl for bertha armyworm control is not likely to contaminate rape seed with undesirable levels of residues.

Type
Articles
Information
The Canadian Entomologist , Volume 104 , Issue 11 , November 1972 , pp. 1745 - 1750
Copyright
Copyright © Entomological Society of Canada 1972

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