Bollworms, however, are not necessarily developing resistance to the cotton's insecticide.

然而，棉铃虫并不一定会对棉花的杀虫剂产生抗药性。

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Plantings of cotton bioengineered to produce its own insecticide against bollworms, a major cause of crop failure, sustained little bollworm damage until this year.

经过生物工程改造的棉花种植场可以生产自己的抗棉铃虫杀虫剂，而棉铃虫是造成农作物歉收的主要原因，直到今年，棉铃虫的危害都很小。

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The study involved bollworms, a major threat to cotton farmers.

这份研究涉及棉铃虫，对棉农来说，这是最大的威胁。

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The study involved bollworms, a major threat to cotton farmers.

这份研究涉及棉铃虫，对棉农来说，这是最大的威胁。

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