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Effect of Pesticide Treatments on Nontarget Organisms in California Rice Paddies: I. Impact of Triphenyltin hydroxide: II. Impact of Diflubenzuron and Triflumuron

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  • Grigarick, A. A.
  • Webster, R. K.
  • Meyer, R. P.
  • Zalom, F. G.
  • Smith, K. A.

Abstract

An application of triphenyltin hydroxide at 1.16 kg (AI)/ha to rice fields for stem rot (Sclerotium oryzae Catt.) control resulted in a significant reduction of 57% of the invertebrate taxa and 67% fewer individuals based on two collecting methods that sampled the nekton, neuston, and benthon. Populations of herbivores, carnivores, and filter feeders were sharply reduced after treatment, and most remained so through the 28th day following application. By day 50 many of the winged species recovered in both numbers and diversity. However, recovery of benthic organisms was slower or not at all for most Crustacea. An initial reduction followed by a strong resurgence was noted for the mosquito Culex tarsalis Coq., which was probably due to the significant reduction of five predaceous species.

Suggested Citation

  • Grigarick, A. A. & Webster, R. K. & Meyer, R. P. & Zalom, F. G. & Smith, K. A., 1990. "Effect of Pesticide Treatments on Nontarget Organisms in California Rice Paddies: I. Impact of Triphenyltin hydroxide: II. Impact of Diflubenzuron and Triflumuron," Hilgardia, California Agricultural Experiment Station, vol. 58(1).
    • Handle: RePEc:ags:hilgar:381664
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