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Abstract
The experimental design is described for a 8500-ha pilot management test of wheat bran bait containing insecticide, Nosema locustae Canning, or both, for control of a complex of rangeland grasshoppers. One objective was to determine which species accepted the bait. Field plots were treated by aircraft with 0.56, 1.12, or 1.68 kg or 1.96% carbaryl-treated flaky wheat bran bait/ha. Acceptance of bait varied greatly within 28 observed species of grasshoppers. All major pest species except Amphitornus coloradus (Thomas) and Camnula pellucida (Scudder) were susceptible. In general, species of Acridinae and Gomphocerinae (slant-faced grasshoppers) suffered slightly greater mortality than species of Melanoplinae (spur-throated grasshoppers), while Oedipodinae (banded-wing grasshoppers) were affected least. Such differences could be exploited in a management program based primarily on judicious use of selective bait.
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