![Bollwormsareatraditionalthreattocottoncrops．Youngonesfe...]( "Bollwormsareatraditionalthreattocottoncrops．Youngonesfe...")
- 問題詳情：Bollwormsareatraditionalthreattocottoncrops．Youngonesfeedontheboll,thepartofthecottonplantthatcontainstheseeds．AbacteriumknownasBtisabletokillbollwormsandsomeotherpests．BtisshortformforBacillusthuringiensis．Itwasdiscoveredintheearlytwentiethcentu...
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