Effectiveness of aldicarb in the control of the western flower thrips, Frankliniella occidentalis (Pergande), in table grapes in Northwestern Mexico

Abstract

The effectiveness of aldicarb 15 G at 20 and 30 kg/ha was evaluated for the control of the western flower thrips, Frankliniella occidentalis (Perg.) on grapes, cv. Thompson Seedless. A regional check, which required three applications of insecticides, and an absolute check (untreated control) was provided to make comparisons. Aldicarb at 30 kg/ha (4·5 kg a.i.) was effective and satisfactory control was achieved in reducing thrips populations during the bloom stage. A greater proportion of flowers per thrips was observed where aldicarb was applied at 30 kg/ha and on the treated regional check. A higher flower: thrips ratio is desirable, as a lower ratio results in greater potential damage to berries. Damage to berries was lower with aldicarb at 30 kg/ha and with the regional check. Aldicarb at 30 kg/ha reduced damage by 36% in relation to the absolute untreated check and 7% in relation to the regional treated check.