The defoliation of millions of acres of trees by massive infestations of gypsymoth 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。
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The gypsymoth is also subject to attack by the nucleopolyhedrosis virus, or wilt disease, a particularly important killer of the caterpillars in outbreak years.
舞毒蛾还会受到核多角体病毒或萎蔫病的攻击,在毛虫爆发的年代,这是一种特别重要的杀手。
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In stands dominated by trees such as aspen, however, incipient gypsymoth outbreaks are quickly suppressed by viral epidemics.