▁used ▁in ▁conj unction ▁with ▁p estic ides ▁like ▁B t . ▁In ▁November ▁ 2 0 1 5 , ▁a ▁study ▁was ▁conducted ▁exam ining ▁the ▁effects ▁of ▁B tk ▁on ▁Tr ich ogram ma ▁ch ilon is ▁was ps . ▁The ▁study ▁showed ▁that ▁high ▁dos es ▁of ▁stra ins ▁of ▁B tk ▁containing ▁ δ - end ot ox ins ▁were ▁ac utely ▁to xic ▁to ▁the ▁was ps , ▁while ▁B tk ▁without ▁these ▁to x ins ▁had ▁no ▁ad verse ▁effects . ▁It ▁further ▁showed ▁that ▁low ▁dos es ▁of ▁B tk , ▁regardless ▁of ▁the ▁stra in , ▁led ▁to ▁significantly ▁greater ▁lon ge vity ▁in ▁the ▁was ps . ▁ ▁So il ▁ ▁In ▁a ▁ 1 9 9 8 ▁study , ▁B tk ▁was ▁added ▁to ▁different ▁types ▁of ▁soil ▁in ▁order ▁to ▁determine ▁how ▁the ▁type ▁of ▁soil ▁affected ▁the ▁pers istence ▁and ▁concentration ▁of ▁B tk . ▁The ▁results ▁of ▁the ▁study ▁showed ▁that ▁insect ic idal ▁activity ▁started ▁to ▁decl ine ▁after ▁only ▁a ▁month ▁in ▁one ▁soil , ▁while ▁in ▁another ▁to x icity ▁was ▁still ▁high ▁after ▁six ▁months . ▁The ▁authors ▁of ▁the ▁study ▁noted ▁that ▁even ▁though ▁B tk ▁is ▁considered ▁non - to xic ▁to ▁n ont arget ▁species , ▁the ▁accum ulation ▁and ▁pers istence ▁of ▁the ▁B tk ▁to x ins ▁could ▁eventually ▁lead ▁to ▁environmental ▁ha z ards ▁or ▁the ▁selection ▁of ▁B tk - res istant ▁le pid opter ans . ▁ ▁References