福建省稻水象甲分布与发生规律研究

稻水象甲在福建省年发生1代。我省福鼎市和霞浦县是稻水象甲发生的疫区,2004年,两地分别有11个和10个乡镇发生稻水象甲疫情,累计发生面积1 597.6 hm2;稻水象甲发生和为害受作物品种和生境条件等因子的影响较为明显,糯稻受害程度大于杂交稻,秧田水稻的株被害率和成虫密度大于移栽田。

Distribution and occurrence of rice water weevils in Fujian

The occurrence and development of rice water weevil(Lissorhoptrus oryzophilus Kuschel) were studied in Fujian.The results indicated that the rice water weevils annually developed by one generation.Thus far,significant damages caused by the rice water weevils were only found in two counties,i.e.,Fuding and Xiapu.There were 1597.6 hectares of rice field in total that were infested by the pest.The infested areas were distributed in 21 towns in the two counties by the end of 2004.The occurrence and degree of damage by the rice water weevil were more obviously affected by the rice varieties and the ecotopic environment of paddy fields.The study revealed that the degree of damage by the pests of L.oryzophilus was more serious on glutinous rice than hybrid rice.The density and the damage rate of L.oryzophilus on the seedlings were higher than those on the transplanted plants in the rice field.