A Systems Analysis Approach to Brown Planthopper Control on Rice in Zhejiang Province, China. II. Investigation of Control Strategies
Abstract
(1) A simulation model of brown planthopper (BPH) (Nilaparvata lugens Stal.) population dynamics, described by Cheng and Holt (1990), was used to assess the performance of different insecticide control strategies. (2) Since field trials indicated that the loss in rice yield associated with BPH attack was linearly related to the peak density of the second generation, control strategies were assessed in terms of the ability to minimize this peak density. (3) Where a single insecticide treatment was given, the best time at which to apply it was at 30 days after transplanting (DAT). This was true for a range of insecticides, transplanting times, temperatures, and immigration patterns. (4) Where two insecticide treatments were used, treating at 30 DAT remained a robust strategy and allowed considerable flexibility in the timing of the second spray while still achieving an acceptable performance. (5) The main problem concerning BPH control in Zhejiang Province is to decide whether insecticide treatment should be applied and, if so, whether one, two or more treatments should be given. Thresholds at which treatment is required to prevent BPH causing 5% yield loss were determined for single and two-treatment strategies. These thresholds were found to be particularly sensitive to transplanting time and to September temperatures.
Citation
Cheng, J.A.; Norton, G.A.; Holt, J. A Systems Analysis Approach to Brown Planthopper Control on Rice in Zhejiang Province, China. II. Investigation of Control Strategies. Journal of Applied Ecology (1990) 27 (1) 100-112.