温度对武昌罗索线虫感染和性比的影响

The Effects of Temperature on the Infectivity and Sex Ratios of Romanomermis wuchangensis

不同温度条件下,武昌罗索线虫的寄生前期幼虫对致乏库蚊(Culex pipiens quinquefasciatus)二龄幼虫的有效率不同。笔者分别于15℃,18℃,21℃,24℃,27℃,30℃,33℃和35℃进行了24小时及48小时两组不同暴露时间的感染实验。感染24小时的有效率(%)分别是8.5,15,48.5,75.8,94,74,48和11;感染48小时的有效率(%)分别为19.5,23,53,99.3,89.5,67,72.8和23.5。实验表明,15～25℃均可感染,获得感染最高有效率的温度范围为24～28℃,但要获得最多的雌虫及合适的雌、雄性比则为21℃。

Under the conditions of different temperatures the effective rate of the preparasites larvae of Romanomermis wuchangensis to second-instar of Culex pipiens quinquefasciatus are different. The author has carried out an infectious experiment at two kinds of exposure time (Within 24 hr and 48hr) at 15, 18, 21, 24, 27, 30, 33, and 35℃, respectively. As a result, the effective rate at each of these temperatures were 8.5, 15, 48.5, 75.8, 94, 74, 48.5, 11% (24hr), 19.5, 19, 53, 99.3, 99, 67, 72.8, 23.5% (48hr) respectively. It was clear that the preparasites were infective at 15 to 35℃. The temperature range that obtains the highest effective rate is 24 to 28℃. If most females and optimum sex rate are obtained, the temperature should be at 21℃.