Bacillus thuringiensis kurstaki (Btk) rukuni ne na ƙwayoyin cuta da ake amfani da su azaman abubuwan sarrafa kwayoyin halitta akan lepidopterans.Btk, tare da sauran samfuran B. thuringiensis, ɗaya ne daga cikin magungunan kashe qwari da aka fi amfani da shi saboda ƙayyadaddun sa;yana da tasiri a kan lepidopterans, kuma ba shi da wani tasiri a kan nau'in da ba a kai ba.A lokacin sporulation, Btk yana samar da furotin crystal wanda ke da haɗari ga tsutsa na lepidopteran.Da zarar kwarin ya ci shi, rushewar kristal yana ba da damar sakin protoxin.Daga nan sai ruwan gut na kwari ya kunna gubar, kuma ya fara karya hanjin.
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