海南利用寄生蜂防治椰心叶甲效果分析

为了解海南省利用寄生蜂(姬小蜂和啮小蜂)防治椰心叶甲的效果,于2007年3～4月对海南省17个市县开展寄生蜂防治效果调查,共抽取297个调查点,占全省放蜂点的5%.结果表明:放蜂前,海南省绝大多数市县调查点均属于重度危害点,占全省调查点81%,中度危害点和轻度危害点分别为调查点总数的17%和2%;放蜂后,椰心叶甲危害程度已显著下降,重度危害点已经下降到41%,中度危害点和轻度危害点则上升,目前分别为39%和20%;说明利用寄生蜂控制椰心叶甲的效果非常明显.通过对两种寄生蜂在海南省的分布情况看,目前海南省95%的调查点已经存在寄生蜂定殖,这为将来全省利用寄生蜂可持续控制椰心叶甲打下了良好的基础,但是根据目前椰心叶甲的危害情况,仍有必要继续大量释放两种寄生蜂,以达到对椰心叶甲的有效控制.

Effect of Parasitic Wasps on Control of Brontispa longissima (Gestro) in Hainan Province

In order to know the control effects of parasitic wasps on coconut leaf beetle Brontispa longissim(Gestro) in Hainan province,We selected and investigated 297 sites in 17 cities and counties in March and April in 2007,which occupied 5% of the whole releasing sites.The data showed that 81% investigation sites were severe damage before releasing parasitic wasps in Hainan province,and medium damage sites and light damage sites were only 17% and 2% respectively in the whole investigation sites.But the damage degree of coconut leaf beetle was decreased remarkably after releasing parasitic wasps,and severe damage sites,medium damage sites and light damage sites were 41%, 39% and 20% respectively in the whole investigation sites,indicated that the parasitic wasps could control coconut leaf beetle well.The data also showed that although the parasitic wasps had existed in 95% of the whole investigation sites,we think it is still necessary to maintain releasing parasitic wasps to keep on effective control coconut leaf beetle in Hainan province.