Effect of bacillus thuringiensis on the immature stage of ornithodors savingnyii [argasidae]

The potential activity for the two varieties of Bacillus thuringiensis [kurstaki and israelesis] was evaluated against fourth instar nymph of Ornithodoros savignyli. Bacillus thuringiensis [Dipel-2x] was more effective than B. thuringiensis israelensis [Vectobac]. The effect of this bacterium on the haemolymph protein alteration of previously mentioned tick using SDS-PAGE electrophoresis, and the histopathological changes of the nymphs were also studied