The Australian paralysis tick Ixodes holocyclus.
The Australian paralysis tick Ixodes holocyclus.
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DOI：
10.1111/j.1751-0813.1975.tb09444.x
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发表时间：
1975-01-01
影响因子：
1.1
通讯作者：
Doube, B. M.
中科院分区：
文献类型：
--
作者：
Bagnall, B. G.;Doube, B. M.
At a 1-day workshop at Indooropilly on I. holocyclus about 30 contributors exchanged information on its control and biology. In S.E. Queensland the tick has one generation a year, overwintering as the nymph, with a spring rise of adult females; populations appear to be related to rainfall. In N.S.W. it is numerous in mountain areas but almost absent from coastal plains; some farmers here practise mid-winter calving to reduce paralysis losses. Using guinea-pigs, an experimental model of tick 'immunity' was reported. On first feeding of 200 larvae, about 40% fed and detached. On a second application after 3 weeks, only 1-2% survived. Basophils appear to be important in this skin reaction. Between 3 and 10 female ticks are usually necessary to paralyse a calf 2-3 weeks old, though a violent reaction to single ticks was sometimes reported. Extensive campaigns against foxes and dingoes have led to greater bandicoot numbers, and thus a more severe tick paralysis problem.Some 20 speakers at a one-day workshop on Ixodes holocyclus Neum. in Indooroopilly, Queensland, covered a range of current research on the tick. The size of the tick population in Queensland is probably related to the rainfall in spring and the abundance of bandicoots. The ticks live in gullies near Sydney and are an increasing problem in urban areas. Exposure of cattle to the tick induces a high degree of immunity to further infestation. The toxin produced and its action were discussed, as were the number of ticks required to produce paralysis (possibly only one in cattle). The poisoning campaigns in Queensland and New South Wales against foxes and dingoes have been so effective that there has been a remarked increase in the numbers of bandicoots and in tick paralysis. The possibility of control by dipping is discussed.
