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In 2007–2009, studies on the number of pear sucker and its parasitization degree by the hymenopteran Sectiliclava cleone were carried out on two plots of pear orchard, differing in terms of applied protection strategy (without and with insecticide treatment). The presence of parasitoids was only recorded in case of single insect pests from the summer generations. A parasitization degree of wintering...
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