Pea Moth Control in Field Peas with Insecticides and the Effect on Crop Yield12

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Abstract
In field trials, 11 insecticides were tested against larvae of Laspeyresia nigricana (Stephens) infesting field peas grown for livestock feed or for sale as certified seed. Sprays with carbofuran reduced larval damage by 70% in 1975, and in 1976 sprays with WL 43775 (Benzeneacetic acid, 4-chloro-alpha-(1-methylethyl)-, cyano (3-phenoxyphenyl) methyl ester) reduced damage by 75% Methomyl, dimethoate, NRDC-143 (3-phenoxybenzyl (±) -cis, trans -2, 2-dimethyl-3-(2,2-dichlorovinyl) cyclopropane carboxylate), and WL 43479 (3-phenoxybenzyl 2-(2,2-dichlorovinyl)-3,3-dimethylcyclopropane-1-carboxylate) also resulted in significant reductions in pea moth larval damage. Granular soil treatments reduced the % of damaged peas one year but not the other. Despite reduced pea moth injury through use of insecticides, total yields of the field peas were not affected in these tests. However, the control achieved was not sufficient to meet required quality standards for sale as certified seed in Canada.

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