【摘要】 应用最优分割法分析昆虫群落的季节格局,把桔园(成年树)昆虫群落的季节变化分为四个有序阶段;并揭示了各阶段害虫、天敌的发生特点,提出了桔园害虫综合防治的策略。更多还原

【Abstract】 This paper deals with the seasonal pattern of citrus insect community. The optimal sorting method is used and then the community in a year can be divided into four stages (form April to June, July to September, October to November and December to March of the next year). The characteristics of the pests and the natural enemies occuring in each stage and the corresponding management tactis are discussed. The first stage is the opportune time for chemical control because most of the pests appear at the first peak but the density of the natural enemies is relatively low. At the second and fourth stage the pests and the natural enemies decline because of high temperature and low temperature respectively. At the third stage, the temperature changes form high to suitable degree. Many pests appear at the second peak and the natural enemies increase too. Therefore, the biological control should be emphasized at the stage.更多还原