1. Further research has shown that caterpillars become virtually immune to the wilt virus as the trees on which they feed respond to increasing defoliation. 进一步的研究表明，毛虫对萎蔫病毒几乎具有免疫力，因为它们赖以为生的树木会对越来越多的落叶做出反应。
2. The defoliation of millions of acres of trees by massive infestations of gypsy moth caterpillars is a recurring phenomenon in the northeastern United States. 在美国东北部，舞毒蛾毛虫的大规模侵扰导致数百万英亩的树木落叶，这是一个反复出现的现象。
3. Short-term effects include the disturbances directly associated with the action of the pest, which may cause the defoliation, loss of vigor, or death of trees. 短期影响包括与害虫活动直接相关的干扰，可能导致树木落叶、失去活力或死亡。
4. Perhaps love, just like the defoliation, see fly in the fall! 或许爱情，就像落叶，看似飞翔却在坠落！
5. On the contrary, the amount of defoliation of 25% reach the ElL. 在郁闭林分中失叶量25％达到经济阈值。
