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一、分类及危害稻水象甲以成虫和幼虫危害水稻,成虫食稻叶,幼虫食稻根。以幼虫危害为主。成虫在幼嫩水稻叶片上取食上表皮,留下下表皮;幼虫在水稻根内和根上取食,1—3龄幼虫蛀食根部,4龄后爬出稻根直接咬食根系,根系被害后还常变黑并腐烂,由于根系损坏,植株生长受阻、变得矮小,分蘖率降低,抽穗成熟推迟,造成减产。一般减产在15—20%,严重地块可减产50%以上。二、形态特征
First, the classification and damage Water weevil As adults and larvae damage rice, adult rice leaves, larvae rice roots. Mainly to larvae hazards. Adults fed on the young paddy leaves with the lower epidermis leaving the lower epidermis. The larvae fed on the roots and roots of the rice. The larvae of the first instar larvae eaten their roots and climbed out of the roots after 4 years of age to directly root and root the roots After the often black and decay, due to damage to the roots, plant growth blocked, become short, tillering rate decreased, heading mature delayed, resulting in reduced production. General reduction in 15-20%, a serious block can reduce production more than 50%. Second, the morphological characteristics