例如，每年有150万公顷的森林遭受美国白蛾之害。

For example, American white moths are damaging 1.5 million hectares of forests every year.

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该新种在我国北方美国白蛾发生区分布普遍，也分布韩国。

The parasitoid distributes in all areas where the pest outbreaked in China and in Seoul, Korea.

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在连续对4代美国白蛾进行放蜂的防治区，美国白蛾的危害下降，而对照区美国白蛾仍造成一定的危害。

In parasitic wasp successively released areas where 4 consecutive generations of H. cunea were studied, the damage caused by Fall Webworm decreased but in control areas the damage had no change.

youdao

在连续对4代美国白蛾进行放蜂的防治区，美国白蛾的危害下降，而对照区美国白蛾仍造成一定的危害。

In parasitic wasp successively released areas where 4 consecutive generations of H. cunea were studied, the damage caused by Fall Webworm decreased but in control areas the damage had no change.

youdao