Abstract
Slow-release tablets containing the systemic insecticide oxamyl were formulated. In field tests, one, two, or three oxamyl tablets (0.14, 0.28, and 0.42 kg [AI]/ha, respectively) applied at the root zone in the soil with tomato transplants were equally or more effective than an oxamyl drench application to the transplant (0.28 kg [AI]/ha) or multiple spray applications of oxamyl (1.12 kg [AI]/ha of Vydate 2L applied four times) for protection from Colorado potato beetle (CPB), Leptinotarsa decemlineata (Say). Phytotoxicity was greatest in tomato plants receiving the slow-release tablets, and phytotoxicity increased as number of tablets per plant increased.
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