在对分离世代进行选择处理时，可以选择那些目标性状值较大，而协调指数较小的类型。
The variants which had high value of goal trait and low harmonizing index could be selected when dealt with the separating generations.
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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