No abstract

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.

Effect of the two Neem , A:::adirachta indica extracts, Neem Azal F and T on fed Hylomma dromedarii (Koch) females and their fecundity under laboratory conditions was studied. Females mortality rate increased gradually as Neem extract concentrati on increased (i.e. 0.2 to 0.8%). The LC 50 values were 0.8 and 0. 6% post treatment ofNeem Azal F and T, respectively at the l I th day . Treated females laid fewer eggs than those of the control'. The concentrations 0.2, 0.4, 0.6 and 0.8% ofNeem extract decreased the percentage of hatching eggs from (46.38 to 10.56) and (35.4 to 8.42) and increased the larval mortality rate from (56.46 to 80.34) and from 87.1 5 to 94.53 for Neem Azal F and T, respectively.