ABSTRACT Argentine stem weevil (Listronotus bonariensis) has been confirmed as infesting spring sown pea seedlings drilled on 22 October 2016 on a Canterbury farm. Infestations were observed in two neighbouring paddocks, with a visual estimate of 7–10% of the plants damaged in the worst affected areas. Symptoms included wilting and yellowing of new growth. Visual inspection of infested plants found entry and exit points, mining of the stem and a single larva per seedling. Amplification of mitochondrial barcodes of four larvae collected from individual plants provided a 100% match to L. bonariensis. The peas had been direct drilled into a nil-endophyte Italian ryegrass (Lolium multiflorum) stand that had been treated with herbicide to kill the vegetation but not treated with insecticide before or when the peas were planted, and it is likely larvae have transferred from the dying grass to infest the seedlings. Listronotus bonariensis eggs were also found on one of the plants collected from the paddock on 18 November 2016. This is a new host plant record for L. bonariensis, and while considered a specific pest of grasses, adults will feed on seedling brassicas.

中文翻译：

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草害虫阿根廷茎象甲（鞘翅目：仙茅科）和豌豆之间的新关联

摘要 阿根廷茎象鼻虫 (Listronotus bonariensis) 已被证实侵染 2016 年 10 月 22 日在坎特伯雷农场种植的春播豌豆幼苗。在两个相邻的围场中观察到侵染，目测估计受灾最严重的地区有 7-10% 的植物受损。症状包括新生长的枯萎和变黄。对受感染植物的目视检查发现了入口和出口点、茎的开采和每株幼苗的单个幼虫。从单个植物收集的四个幼虫的线粒体条形码的扩增提供了与 L. bonariensis 的 100% 匹配。豌豆已直接钻入一个无内生菌的意大利黑麦草（Lolium multiflorum）林中，该林已用除草剂处理以杀死植物，但在豌豆种植之前或种植时未用杀虫剂处理，很可能幼虫已经从垂死的草转移到幼苗上侵染。在 2016 年 11 月 18 日从围场收集的其中一株植物上也发现了 Listronotus bonariensis 卵。这是 L. bonariensis 的新寄主植物记录，虽然被认为是一种特定的草害虫，但成虫将以芸苔幼苗为食。