Examples of Boophilus microplus (Can.) collected from calves in Queensland with patent infection by Anaplasma marginale were incubated at either 4--5, 14, 22, 27 or 37 deg C for up to 14 days. Extracts prepared from larvae, nymphs, immature females, adult males or mixtures of both sexes were...

Experiments were carried out in Queensland to explore the possible relationship between cattle, Rhipicephalus sanguineus (Latr.) and Anaplasma marginale. Calves' ears were exposed to larval, nymphal and adult ticks on 8, 9 and 7 occasions, respectively. The immature ticks fed readily, but the...

This article is part of an extension programme on the control of Boophilus microplus (Can.) on cattle in south-eastern Queensland. It includes sections on cattle ticks and profitability (in which 3 methods of tick control (traditional dipping programmes, strategic dipping and a dipping programme...

The topics dealt with in this article from Queensland on the biology, injuriousness and control of Boophilus microplus (Can.) on cattle in Australia include the biology of this species, and Haemaphysalis longicornis Neum. and Ixodes holocyclus Neum.; cattle ticks and profitability; breeding...

The results are presented of a long-term study in Queensland in 1965-75 on the effectiveness and economic advantages of 2 methods of controlling ticks [Boophilus microplus (Can.)] and the pathogens they transmit (Babesia bovis and Anaplasma marginale) in Droughtmaster, a relatively tick-resistant...

Bos indicus-crossbred calves (groups of 180 and 124) exposed to natural Babesia bovis infection in wet and dry tropical environments in northern Queensland, Australia, were tested for antibodies using the indirect haemagglutination (IHA) test. There was evidence of maternal antibodies suggesting...

In Australia, 386 clinical outbreaks of anaplasmosis were confirmed in Queensland south of the 22nd parallel over the period 1967 to 1976. 78% of these outbreaks occurred during autumn and winter and only 6.8% involved cattle less than one year of age compared with 54.8% for cattle more than 3...

Natural infection of calves with Anaplasma marginale was studied in 2 endemic areas of tropical northern Queensland. Infection, which was assessed by a micro-complement fixation test, occurred throughout the year but was most frequent just after the summer wet season. Up to 90.6% of cross-bred Bos...

Outbreaks of Babesia argentina, B. bigemina and Anaplasma marginale on cattle in Queensland are analysed for the period from 1966 to 1976. The 3 pathogens were responsible for 73, 6 and 21% of the outbreaks, respectively, and there was no evidence for any change in the proportion in the past 10-15...

Outbreaks caused by B. argentina, B. bigemina and A. marginale in Queensland between 1 July 1966 and 30 June 1976 were assessed. Of all outbreaks 73% were caused by B. argentina, 21% by A. marginale and 6% by B. bigemina. There is no evidence to indicate that the numbers of outbreaks have undergone ...