【作者】 丁建清； 王韧； 付卫东； 陈志群；

【Author】 Ding Jianqing;Wang Ren;Fu Weidong;Chen Zhiqun;Biological Control Institute,Chinese Academy of Agricultural Sciences;

【机构】 中国农业科学院生物防治研究所；

【摘要】 试验表明可同时应用象甲和农达控制水葫芦,以达到快速、持续的控制效果,但农达的浓度应选择适当。浓度为4.5kg/ha和1.5kg/ha的化防和综防处理区中,由于农达的作用,水葫芦植株在20~50d内大部分死亡,水葫芦象甲也很快死亡,象甲难以发挥有效的作用。浓度为0.45kg/ha的综防区中,水葫芦象甲和农达同时作用,对水葫芦的叶片数、繁殖量和生物量起到了明显的抑制作用,与单独施用同样浓度的化防区和只释放象甲的生防区有显著差异,而且象甲保持了一定的种群密度。而浓度为0.045kg/ha的综防区与只放象甲的生防区控制水葫芦的效果一样。更多还原

【Abstract】 In order to get a fast and sustainable suppression of water hyacinth(Eichhomia crassipes)control effect tests with the weevil,Neochetina eichhomia after sprayed with 41%Roundup at different concentrations were conducted in plots outdoor.The results showed that 50%- 100%plants died after 3- 8 weeks of spraying with Roundup at the concentrations of 4.5kg/ha and 1.5kg/ha and all the weevils also died because of the lack of food.But in the plots treated with Roundup at the concentration of0.45kg/ha the weevil remained its population well,and the reproduction and biomass of the plants were gready suppressed as the result of the weevil and herbicide.Compared with the plots treated only with weevil,there were no great difference about the control effect in the plots treated both with the weevil and Roundup at the concentration of 0.045kg/ha.This indicated that the herbicide at this concentration could not suppress the growth of the plant.The paper revealed that it is possible to use Roundup and the weevil to control water hyacinth at same time but the concentration should be in a suitable level so as to leave enough food for weevil.更多还原