摘要
伪钝绥螨是叶螨的有效天敌,1986年引入天水,1987、1988年在苹果园进行了释放试验,6月中、下旬按1:50的益害比释放于苹果树上,结果表明经过35～40天,苹果全爪螨从峰期(1987、7、31)7.79头/叶和(19888、2)21.84头/叶开始减退,至50～60天,分别减退为1.76头/叶和1.90头/叶,而对照树分别为19.43头/叶(8、20)和44.15头/叶(8、2)。该螨对苹果全爪螨越冬卵的控制效果明显,释放树平均一年生枝条单枝含卵量为15.95粒,化防树为93.64粒。
Amblyseius fallacis was introduced into Tianshui city, Gansu Province in 1986. Mass reared A. fallacis was released in the apple orchards in mid to late June of 1987 and 1988 to control Panonyckus ulmi at a ratio of 1:50 (predatonprey). The population of the spider mite was reduced from 7.79 mites/leaf at its peak (July 31, 1987) and 21.84 mites/leaf (Aug.2, 1988) to 1.76 mites/leaf (1987) and 1.9 mites/leaf (1988),respective!y, 50-60 days after the releases, while the population on the control trees was 19.43/leaf (1987) and 44.15/Seaf (1988), respectively. Release of the predator also gave good controls of the overwintering eggs of the spider mite. The new growth shoots in the releasing orchard had 15.95 eggs/branch, while that in the chemical control orchard had 93.64 eggs/branch.
关键词
苹果
全瓜螨
伪钝绥螨
防治
天敌
Amblyseius fallacls Panonychus ulmi mass rearing apple pest
