七角星蜡蚧在云南省的分布与危害

目的]七角星蜡蚧(半翅目:蚧次目:蚧科:蜡蚧属)是一种外来入侵害虫,自2013年在云南省西双版纳州勐仑镇发现以来,中国大陆再无系统性的调查。近年来作者在云南省收集蚧虫期间,在多地发现七角星蜡蚧为害,现对其在云南省的发生情况进行报道,以期为其监测和防治提供参考。方法]2016年10月—2021年9月,对云南省15州(市)的64个县(区市)进行了系统调查,详细研究了七角星蜡蚧的分布、寄主及一些生物学习性。结果]七角星蜡蚧在云南省西双版纳州的景洪市、勐腊县(勐仑镇和磨憨镇)、勐海县(打洛镇),普洱市的宁洱县,德宏州的盈江县(那邦镇),红河州的河口县、金平县(勐拉乡和者米乡)4州(市)7县(市)9地有分布,新增8个分布点。除宁洱县外,其余发生地均位于边境线上,表明其可能为境外多点入侵。在云南该虫危害寄主植物共4科4属5种,包括杧果和莲雾2种经济树种。七角星蜡蚧多寄生在叶片背面,沿叶脉分布,1年发生多代。在河口县的龙船花上,该虫每雌产卵38~50粒,虫口密度达185~250头·叶^-1。结论]七角星蜡蚧在云南省零星分布,尚未造成严重损害,但有向内扩散的趋势,应加以警惕。

Distribution and damage of Ceroplastes stellifer (Westwood) in Yunnan Province

Aim] The star scale Ceroplastes stellifer is an invasive alien pest that has not been systematically investigated in mainland China since its discovery in 2013 in Menglun Town, Xishuangbanna, Yunnan Province. Therefore, in this study, we studied its distribution and damage in Yunnan Province, which can provide useful information for its monitoring and management. Method] The distribution, host, damage, and biological characteristics of C. stellifer were investigated from October 2016 to September 2021 in 64 counties of Yunnan Province. Result] Our survey found nine C. stellifer localities, which were distributed in seven counties of Yunnan Province: Jinghong, Mengla (Menglun and Mohan town), Menghai (Daluo Town), Ning''er, Yingjiang (Nabang Town), Hekou, Jinping (Mengla town and Zhemi town). Except for Ning''er, all the other localities are located on the borderline, indicating a multi-point invasion pattern. This insect was found to feed on five plant species from four genera of four families, including two economic species, mango, and wax apple. C. stellifer mostly parasitized the back of the leaves, along the veins. It had multiple generations in a year. The population density was 185-250 per leaf on the Ixora chinensis. Each female could lay 38-50 eggs. Conclusion] C. stelliferwas distributed sporadically in Yunnan province and has not caused severe damage. However, this pest tends to spread farther and more expansive and warrants further attention.