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SIMULATION AND OPTIMAL MANAGEMENT OF THE PEST‐NATURAL ENEMY‐INSECTICIDE SYSTEM OF PADDY FIELDS IN MIDDLE SEASON RICE CROPPING REGION *
Author(s) -
Shi Gensheng,
Zhang Xiaoxi
Publication year - 1998
Publication title -
insect science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 45
eISSN - 1744-7917
pISSN - 1672-9609
DOI - 10.1111/j.1744-7917.1998.tb00323.x
Subject(s) - pest analysis , integrated pest management , economic threshold , biology , cropping , pest control , agronomy , population , agricultural engineering , agriculture , agroforestry , ecology , engineering , botany , demography , sociology
Investigations on the pest‐natural enemy‐insecticide system, including rice leaf roller‐spider‐tamaron and planthopper‐spider‐tamaron system, were carried out in the paddy fields in middle season rice cropping region. The relationship among insect pest, natural enemy and insecticide were studied based on the principle of the pest management system engineering. The optimal management models of the two systems were developed. Their diagrams of optimal feedback control strategy were contoured for computer monitoring of the pest‐natural enemy‐insecticide system. The population densities of pest and natural enemy in the future could be forecasted and the optimal strategy could be made when the current field densities of pest and natural enemy were input into the computer. The optimal performance index, which is a combination of the total cost of using the chemical and the total cost of pest damage to crops, for pest control is minimized. The objective of the system management is to drive the state of the system towards a beneficial equilibrium of the system generally. A comparison of the new IPM strategy with the ordinary strategy based on a single economic threshold is conducted in this paper. The optimal control strategies suggest that both pest and natural enemy populations should be controlled in the integrated pest management.