棉 花 学 报 Cotton Science 2007，19(2)：145-150
Advance in Research on Allothrombium ovatum，an Ectoparasitic Natural Enemy of Aphis gossypii Abstract：Allothrombium ovatum is a kind of ectoparasitic natural enemy for cotton aphid(Aphis gossypii) ，which widely distributes in northern cotton production areas in China. They emerge early with density population，and greatly inhibit the population increase of cotton aphid. In this paper，the results of researches on the biology and ecology of A.ovatum and its sustainable utilization were overviewed. The researches covered the natural enemy ' s life history；the developmental duration of its eggs，prelarva，larva，nymphochrysalis，nymph，preadult and adult；and its habit and habitats in different developmental stages，hosts for larva，host preference，the prey of adult，nymph and the fecundity of adult；A.ovatum origin，dispersal and population dynamic in the cotton fields；the maximum load of mites for alate(cotton aphid) and the migration numbers；the niche and spatial pattern of Aphis gossypii-A.ovatum；the effects of larva parasites on aphids and the threshold value of control aphids(A.ovatum)；the correlation between the population density of the mite and altitude of cotton fields，water table，continuous cultivation time and cultural methods. It contained the selective toxicity of the seed treatment with insecticides ， insecticides spraying and painting cotton stems on cotton aphid and A.ovatum as well. Its applying prospect and the methods of protecting and utilizing were put forward.
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