體長約5~8mm,頭前伸似象的鼻子,複眼半球形略突,頭部為黑色,觸角為黑色,先端部的棍棒狀為紅褐色,雌蟲的棍棒狀約佔觸角的三分之一,但雄蟲較長約有三分之二。吻部比前胸還長,鞘翅重合呈長卵形,寬於前胸,翅鞘為黑藍色,平滑有光澤,前胸及各腳為紅褐色,腿節近棒狀。
分布於平地至低海拔地區,是甘藷最重要的害蟲,成蟲多棲息於葉蔓間,嚙食塊根或葉柄,成蟲通常以步行移動,很少飛翔,有假死之習性,年發生七至八世代,以8月至1月間發生密度最高。卵產於主蔓基部或塊根表皮內,孵化幼蟲蛀入主蔓或塊根內潛行嚙害,老熟幼蟲在危害部位化蛹,被害部位留有許多蛀孔及表皮產生裂痕,呈現褐色且木質化,因此產生惡臭味,不能再食用。
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