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Two neonicotinoid seed dressing insecticides (imidacloprid and thiamethoxam) are registered in South Africa for control of the black maize beetle, Heteronychus arator, in maize. The systemically translocated antifeedant and/or repellent activity of these two neonicotinoids and an unregistered neonicotinoid, acetamiprid, were compared in laboratory bioassays. In all trials treated and untreated seed...