The concentration of lamdacyhalothrin and its effect on the cutworm Agrotis segetum (Lepidoptera: Noctuidae)

Abstract

During initial screening of the synthetic pyrethroid lamdacyhalothrin (PP 321) at a concentration of 44 and 22 mg/1 and applied as a 30 ml drench over each plant against third to fourth instar cutworms, Agrotis segetum (Denis & Schiffermuller) in microplots, few died but they did not damage the plants.Reducing the concentrations to 11 and 5.5 mg/1 increased mortality and plant damage. When A. segetum were confined on soil treated with the insecticide at concentrations of 22, 11 and 5.5 mg/1 and sprayed at an equivalent rate of 500 1/ha, they all died within one day. The higher concentrations appeared to have a repellent and/or antifeedant effect, and it has been possible to reduce the concentration of lamdacyhalothrin to 12.5 mg/1 (=5.6g a.i./ha) for the drench treatment without risking economic plant damage. For insecticides that have repellent and/or antifeedant properties, it should be possible to balance lower concentrations with adequate protection of plants from pest damage.

Lambda-cyhalothrin: an insecticide for hemipteran pest control in white clover seed crops

“…In view of successful control of potato mirids in the cage experiment, however, further investigation of lambda-cyhalothrin is warranted and it may be that higher concentrations are required to control potato mirids in the field. Blair (1991) found that high concentrations of lambda-cyhalothrin appeared to have a repellent and/or antifeedant effect on insects. This may have been partly responsible for higher mortality in the cages than in the field trial.…”

Control of hemipteran pests in lucerne and red clover seed crops using lambda-cyhalothrin

“…Lambda-cyhalothrin has a repellancy and/or antifeedant effect on insects (Blair 1991). The long-term residual effect (up to 34 DAT for ACM) of lambda-cyhalothrin makes it a versatile insecticide that can either be applied as a curative or preventative control for ACM.…”

Gynandromorphy Behavior of Lepidopterans

“…There have been reports of gonandromorphism from 18families in this order. Among them, a lot of specimens have been reported for butterfly species (e.g., in Geometridae, Lycaenidae, Nymphalidae, Pieridae, Papilionidae) [3,[10][11][12][13][14][15] and also for moths (e.g., Noctuidae) [16,17]. However, the Papilionidae, Pieridae, and Saturniidae families account for the majority of cases [9].…”