If irradiation time is too long, the hatching rate would be reduced.
照射时间过长，孵化率反而降低。
It also has difference between the hatching rate and the amount of eggs in different match.
不同的配比模式之间产卵量和孵化率也存在显著差异。
The extracts of acetone and petroleum ether had no effect to the hatching rate and egg development duration, but they were toxic to the newly hatched larvae of Plutella xylostella.
丙酮和石油醚提取物对小菜蛾卵的孵化及卵的发育历期没有影响，但有增加初孵幼虫死亡率的作用。
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