Management of brown planthopper in relation to population dynamics
1987
Perfect, T.J. (Overseas Development Natural Resources Inst., College House, Wrights Lane, London (UK))
Direct plant damage through sap removal during feeding gives rise to "hopperburn" and the insect acts as vector for the virus diseases ragged stunt and grassy stunt. Control using insecticides has been very effective in temperate rice and research has concentrated on the development of monitoring systems to predict the occurrence of damaging population levels and anticipate the need of chemical control. In contrast, under tropical conditions the development of resistance has been widespread with the phenomenon of resurgence presenting increasing problems. These differences appear to be related to variations in the way population regulation mechanisms operate in the two situations. To date, most reliable means of controlling tropical populations of brown planthopper has been through the cultivation of resistant varieties of rice. This approach has not however, been without problems. The future for effective brown planthopper management throughout its range depends on a detailed understanding of the factors inducing outbreaks and the integration of available control techniques to limit both insect spread and population development. The aim of the present paper is to review current understanding of brown planthopper population dynamics and consider its implications for the development of management strategies.
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