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花卉植物虫害:白星花金龟

Miss Chen
2017-09-17
分布与危害

#白星花金龟 Postosia brevitarsis Lewis又名白纹铜花金龟、白星花潜。属鞘翅目花金龟科。分布全国。为害鸡冠花、蔷薇、蜀葵、秋葵、菊花、大花萱草、美人蕉、金叶女贞、樱桃、葡萄。成虫不仅咬花卉叶、芽、花冠,还群食果实,造成谢花落果,尤其喜欢吃腐烂的果实。

形态特征

成虫体长22毫米,宽12毫米左右。体黑紫铜色,有金属色泽。体宽背平,鞘翅上有白色斑纹。臀板有绒斑6个,外露。幼虫俗称蛴螬,体长约30毫米,乳白色。

发生规律

1年发生1代,以幼虫在腐殖质土和厩肥堆中越冬。翌年4~6月幼虫断断续续老熟,在20厘米左右土层中化蛹,蛹期约20多天。6~10月为成虫期,6~7月为盛发期,对果汁和糖醋液有趋性,有假死性,受惊动后,飞走或掉落。成虫白天为害花冠使花朵谢落。7月逐渐转到果实上为害,造成果实坑疤或腐落。成虫产卵于土中,卵期约为10天。孵化后的幼虫在土中和堆肥料中栖息,取食腐殖质,秋天后寻找合适场所在土中越冬。

防治方法

(1)消灭虫源。改变花卉栽培技术;田间不堆放粪肥与垃圾等。

(2)药剂防治。根灌50%辛硫磷1000倍液,此药严禁叶面喷施。

(3)保护和利用天敌。如白僵菌、绿僵菌、土蜂。
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