【摘要】 杨扇舟蛾1年中第1代至第2代种群数量保持增加趋势;幼虫3龄期是影响下一代种群数量变动的关键虫期,也是防治的最佳时期;3龄幼虫期的捕食因子为关键因子,决定系数r2为0 5588捕食因子(b值)为0 4232.更多还原

【Abstract】 The population occurrence rate of the 1st and 2nd generation of Clostera anachoreta (Fabricius) has an increasing tendency in a year. The period of the 3nd instar larvae is the key stage affecting the population occurrence rate of the following generation and the best stage of controlling it. Being preyed during the period of the 3nd instar larvae is the key factor. The decision coffieient(r~2) is 0.558 8,the factor of predation (b) is 0.423 2.更多还原