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The effects of Alsystin were tested on Locusta migratoria migratorioides larvae in stages 2-4 in field cage-trials carried out in the semi-desert area of the Red Sea Province of Sudan. The mortality rates achieved (between 60 % and 90 %) increased with the dosage used (between 10 and 80 g a. i./ha). However, these values were only reached 18 days after treatment. The most frequently observed defect in the dead larvae was a ’soft’, incompletely hardened cuticle, often ruptured at the intersegmental membranes. Application of Alsystin caused no detectable reduction in the locusts’ feeding activity. Consequently, the crop plants in the cages (Pennisetum) were completely consumed during the 20-day experimental period.