结果显示，柑桔粉虱第一、二、三世代的种群趋势指数分别为8。
The population trend indexes for its lst, 2nd and 3rd generation were 8.
研究了温度对斜纹夜蛾的发育、存活、生殖、种群参数和种群趋势指数的影响。
Effect of temperature on development, survival, reproduction, population parameter and population trend index of Spodoptera litura (Fabricius) were studied.
施用化学杀虫剂的种群趋势指数（）为7.20，干扰作用控制指数为1.43，即种群趋势指数将增长为对照的1.43倍。
The index of population trend in treatment of spraying chemical insecticides was 7.20, The index of population trend would increase in 1.43 times against that in control.
测定了不同温度下莲雾毒蛾各虫态的存活状况，并就卵孵化率、幼虫存活率、蛹羽化率、产卵量和种群趋势指数等指标与温度的关系进行相关性分析。
The regression equations of the rates of hatching, larvae survival, emergence, the egg number laid by a female and population trend indices against temperatures were analyzed.
结果表明，中国梨木虱第一、第二世代种群的趋势指数分别为4．189和3．974； 世代的存活率分别为5．818％和5．52％。
The trend indices of population of 1st and 2nd generations were 4.189 and 3.974, the survival were 5.818% and 5.52%.
结果表明，中国梨木虱第一、第二世代种群的趋势指数分别为4．189和3．974； 世代的存活率分别为5．818％和5．52％。
The trend indices of population of 1st and 2nd generations were 4.189 and 3.974, the survival were 5.818% and 5.52%.
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