Effects of Insecticides on Nilaparvata lugens and Its Predators: Spiders, Microvelia atrolineata, and Cyrtorhinus lividipennis

Authors

W. H. Reissig, International Rice Research Institute
E. A. Heinrichs, International Rice Research InstituteFollow
S. L. Valencia, International Rice Research Institute

Date of this Version

2-1982

Citation

Environmental Entomology 11:1 (February 1982), pp. 193–199.

doi: 10.1093/ee/11.1.193

Comments

Copyright © 1982 Entomological Society of America. Published by Oxford University Press. Used by permission.

Abstract

Thirty-five insecticides used on rice in Asia were tested in the field against Nilaparvata lugens. The most important predators of the pest, Cyrtorhinus lividipennis, Microvelia atrolineata, and predacious spiders, Lycosa pseudoannulata, Tetragnatha, and Araneus species, were also monitored in the test plots. Ten insecticides significantly reduced numbers of N. lugens, but propoxur and ethylan gave the most consistent and effective control. Most insecticides did not significantly reduce populations of spiders and M. atrolineata compared with untreated checks, but they did reduce numbers of C. lividipennis. Fifteen treatments caused resurgence of N. lugens, resulting in significantly higher numbers in the treated plots than in untreated checks. Resurgence was apparently not caused by the toxicity of the materials against predators. Eleven of the insecticides had no effect on N. lugens.