【摘要】 为明确桑蓟马在桑树上的种群活动情况以及异色瓢虫对桑蓟马的捕食能力。采用5点取样，使用盘拍法对桑树上的桑蓟马种群动态进行调查，在室内选取异色瓢虫2龄幼虫和3龄幼虫对桑蓟马2龄若虫和成虫开展捕食能力试验。结果表明，桑蓟马发生高峰期与桑树生长旺盛期一致，即在4月下旬至5月桑蓟马数量迅速增加。桑蓟马若虫数量在发生早期、主要发生期和发生晚期，均要高于桑蓟马成虫，若虫最高数量为103.49头/枝。异色瓢虫对桑蓟马若虫和成虫的捕食作用符合HollingⅡ型功能反应模型，桑蓟马相同龄期时，异色瓢虫3龄幼虫的控制能力大于2龄幼虫，异色瓢虫3龄幼虫对桑蓟马2龄若虫的捕食上限最高为416.67头。异色瓢虫2龄幼虫对桑蓟马成虫的捕食上限最低为104.17头，异色瓢虫对桑蓟马的捕食数量受自身密度的影响。异色瓢虫对桑蓟马具有较强的捕食潜力，并且对桑蓟马若虫的捕食数量高于对桑蓟马成虫的捕食数量。本研究可为采用异色瓢虫对桑蓟马进行生物防治的田间应用提供理论依据。更多还原

【Abstract】 To clarify the population activity of Pseudodendrothrips mori on mulberry trees, the five-site sampling and clapping method were used to investigate the population dynamics of P. mori on mulberry. Meanwhile, to clarify the predation ability of Harmonia axyridis to P. mori, the predation ability of 2nd and 3rd instar larvae of H. axyridis to the 2nd instar nymphs and adults of P. mori were tested in laboratory. The results showed that the peak period of P. mori was consistent with the vigorous growth period of mulberry. The number of P. mori increased rapidly from late April to May. The number of nymphs of P. mori was higher than that of P. mori adults in the early, main and late stages of occurrence, and the maximum number of nymphs was 103.49 individuals per branch. The predation of H. axyridis to nymphs and adults of P. mori conformed to the Holling Ⅱ functional response model. The control ability of the 3rd instar larvae of H. axyridis to P. mori was stronger than that of the 2nd instar larvae when P. mori was of the same age. The maximum predation upper limit of the 3rd instar larvae of H. axyridis to the 2nd instar nymph of P. mori was 416.67 individuals, and the minimum predation upper limit of the 2nd instar larvae of H. axyridis to P. mori adults was 104.17 individuals. The predation of H. axyridis to P. mori was affected by its density. H. axyridis has strong predation potential to P. mori, and its predation number to P. mori nymphs was higher than that to P. mori adults. This study provides a theoretical basis for the field application of H. axyridis in biological control of P. mori.更多还原