Low Rates of Insecticides and Nosema locustae (Microsporidia: Nosematidae) on Baits Applied to Roadsides for Grasshopper (Orthoptera: Acrididae) Control

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Abstract
Wheat-bran baits treated with either low dosages of chemical insecticides (carbaryl and dimethoate) or with Nosema locustae Canning were applied to reduce abundance of grasshoppers in roadside vegetation. Both carbaryl and dimethoate provided acceptable short-term reductions. Application of baits containing 4% carbaryl or 4% dimethoate (80 g/ha) resulted in 76 and 70% mortality after 4 d, respectively. After 31 d, 10% of the grasshoppers collected from the N. locustae-treated plots were infected. Infection rates were equal in roadside populations treated with 2 or 4 kg N. locustae bait per hectare.