▁Category : 2 0 0 8 ▁establish ments ▁in ▁Florida ▁N B W - DT ▁Category : S inc la ir ▁Broadcast ▁Group ▁Category : T ampa ▁Bay ▁Bu cc ane ers ▁broad c aster s <0x0A> </s> ▁Bac ill us ▁th uring i ensis ▁ser ot ype ▁kur st aki ▁( B tk ) ▁is ▁a ▁group ▁of ▁b acter ia ▁used ▁as ▁bi ological ▁control ▁agents ▁against ▁le pid opter ans . ▁B tk , ▁along ▁with ▁other ▁B . ▁th uring i ensis ▁products , ▁is ▁one ▁of ▁the ▁most ▁widely ▁used ▁bi ological ▁p estic ides ▁due ▁to ▁its ▁high ▁specific ity ; ▁it ▁is ▁effective ▁against ▁le pid opter ans , ▁and ▁it ▁has ▁little ▁to ▁no ▁effect ▁on ▁n ont arget ▁species . ▁During ▁sp or ulation , ▁B tk ▁produces ▁a ▁cry stal ▁protein ▁that ▁is ▁le th al ▁to ▁le pid opter an ▁lar va e . ▁Once ▁ing ested ▁by ▁the ▁insect , ▁the ▁dissol ution ▁of ▁the ▁cry stal ▁allows ▁the ▁proto x in ▁to ▁be ▁released . ▁The ▁to x in ▁is ▁then ▁activ ated ▁by ▁the ▁insect ▁gut ▁ju ice , ▁and ▁it ▁begins ▁to ▁break ▁down ▁the ▁gut . ▁ ▁B tk ▁is ▁available ▁commer cially ▁and ▁is ▁commonly ▁known ▁as ▁" G arden ▁D ust " ▁or ▁" C ater p ill ar ▁K iller ", ▁both ▁of ▁which ▁are ▁produced ▁by ▁Sa fer ▁Brand . ▁Other ▁B tk - produ cing ▁companies ▁include ▁Bon ide ▁and ▁Mon ter