莲草直胸跳甲在不同生态型空心莲子草上的化蛹适应性

The Pupation Adaptability of Agasicles hygrophila on Different Ecotypes Alligatorweed

对莲草直胸跳甲在不同生态型空心莲子草上化蛹能力的研究表明:美国和重庆种群对不同生态型空心莲子草的化蛹适应性无显著差异;空心莲子草的生态型是影响莲草直胸跳甲化蛹能力的重要因子,在水生型草上化蛹能力显著高于湿生型和旱生型;水生型空心莲子草的直径大小不影响跳甲的化蛹能力,而陆生型空心莲子草的直径是影响其化蛹能力的重要因子;在陆生型草上,随着生长环境水分的降低,莲草直胸跳甲对直径较大的空心莲子草有很强的选择性;该虫在不同生态型草上的化蛹率与化蛹位置有关。莲草直胸跳甲能有效地控制水生型空心莲子草,对陆生型草可起到一定程度的抑制作用。

This paper deals with the pupation adaptability of the flea beetle, Agasicles hygrophila on different ecotypes of alligatorweed. Ecotype of alligatorweed was found to be the key factor affecting the pupation of this beetle. The pupation adaptability of this beetle was significantly higher on the aquatic type than the terrestrial types. The diameter of the aquatic type did not affect the pupation of the beetle while the diameter of the terrestrial alligatorweed showed significant effect on the pupation. When the water content of the environment was decreasing, the beetle on the terrestrial type weed would choose the weed having larger diameter. The ecotype of the weed also affected the pupation site and rate of pupation. The flea beetle is a successful agent for the control of aquatic alligatorweed but less effective to terrestrial weeds. 