水葫芦象甲成虫取食量研究

本文研究了从国外引进的水葫芦天敌昆虫水葫芦象甲 N eochetina bruchi和 N .eichhorniae的取食习性。研究结果表明两种水葫芦象甲的雌虫取食量均显著大于雄虫 ,雌虫取食量为 2 0 6 .5 - 2 0 9.2 mm2 / d,雄虫为 4 8.5 - 71.0 mm2 / d,但两种雌虫之间和两种雄虫之间的取食量无差异。N.bruchi的雌虫喜欢取食叶片的叶面和叶背 ,日取食量分别为 83.5和 71.7mm2 ,两者之间差异不显著 ;雄虫则在叶背取食较多。 N.eichhorniae雌虫在叶背取食多于叶面和叶柄 ,分别为 10 2 .8、4 3.2和 6 3.2 mm2 / d;雄虫在叶背和叶柄的取食量大于叶面。上述结果为利用这两种象甲控制水葫芦提供重要参考

STUDY ON DAMAGE OF THE ADULTS OF WATERHYACINTH WEEVILS NEOCHETINA BRUCHI AND N. EICHHORNIAE (COLEOPTERA: CURCULIONIDAE) TO THE WATERHYACINTH EICHHORNIA CRASSIPES

Waterhycinth Eichhornia crassipes was considered to be one of the most serious weeds in the world. The feeding behavior of the adults of Neochetina bruchi and N. eichhorniae, which were introduced from Thailand, was studied in this paper. The feeding behavior and the difference of feeding between male and female were studied. The results were as follows:(1) Those female of the two species weevils fed much more than the male ones. The feeding area of females was about from 206.5 mm 2 /d to 209.2 mm 2 /d, as that of the males was about from 48.5 mm 2 /d to 71.0 mm 2 /d. (2)The female adults of N. bruchi prefered to feed on leaves, and the female adults of N. eichhorniae prefered to feed on the lower surface of leaf. And it was different that these two weevils fed on different positions of the waterhyacinth, and the control of waterhyacinth weevils on waterhacinth was also studied.