Boophilus annulatus (Say) fed females were collected from healthy cattle (Bos indicus) and the eggs from their pin
ground. Both were found infected with hyphae of Beauvaria bassiana, penetrating tick cuticles and egg membranes.
Ticks were observed immobile and gradually died within 3-4 days. Eggs were dried within 48 hrs. The same
symptoms were observed after exposing uninfected ticks with infected B. annulatus fed females and eggs. Females died
within 4 to 5 days, while the eggs dried and never hatched. Results indicate that fungi can be used as an important
biological control agent against the cattle ticks, B. annulatus.