EFFECT OF FOUR STRAINS OF BACILLUS THORINGIENSIS var KURSTAKI ON EGGS AND LARVAE OF HAEMONCHUS CONTORTUS

摘要

Ovicidal and larvicidal effect of Bacillus thuringiensis var. kurstaki on free living stages of trichostrongylid nematodes is being surveyed using a bioassay in which 48-72 hours culture broth (90% of spores) of the bacteria is added to fresh feces or feces incubated previously for 24 or 48 hours. Treated feces were incubated at 27°C for seven days after which the larvae were recovered through baermanization and formalized for a later counting. Ovicidal effect was observed in two strains and larvacidal effect in four strains.