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1·In stands dominated by trees such as aspen, however, incipient gypsy moth outbreaks are quickly suppressed by viral epidemics.

然而，在以白杨等树为主的林分，最初的舞毒蛾爆发很快就被病毒流行病所抑制。

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·The gypsy moth 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。

4·Spiders also attack the much-feared gypsy moth.

蜘蛛也袭击令人害怕的舞毒蛾。

5·The species' density of the gypsy moth will be controlled under economic permitted level.

终将舞毒蛾的种群密度控制在经济允许水平之下。