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。
Further research has shown that caterpillars become virtually immune to the wilt virus as the trees on which they feed respond to increasing defoliation.
鉴于病毒的存在，树木的防御策略显然适得其反。
Given the presence of the virus, the trees' defensive tactic apparently has backfired.
病毒正传播到其他树木。
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