Barrier treatment with a benzoyl urea insect growth regulator againstLocusta migratoria capito(Sauss) hopper bands in Madagascar

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Abstract
The benzoyl urea insect growth regulator Triflumuron was used for barrier treatment to combat gregarious hopper bands of the migratory locust Locusta migratoria capito in south‐west Madagascar. In a test area of 600 ha, barriers c. 50 m wide, and spaced 300 m apart, were treated with 100 g a.i./ha. In relation to the total area, the dose was 17 g/ha. Eighteen hopper bands were monitored in the plot up to day 9 after application. Seven hopper bands remained in the plot and perished during the moult from the fourth to the fifth larval instar. Some hopper bands which left the plot died also. Hopper bands showing little or no mortality would have crossed additional barriers if the text area had been larger. The results show that barrier treatment with benzoyl ureas can be effective in the control of hopper bands of migratory locusts.

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