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为探明扬州市韭菜迟眼蕈蚊Bradysia odoriphaga Yang et Zhang越冬习性及其种群年动态变化规律,通过田间调查和室内测定对2014—2015年扬州市杭集镇韭菜田韭菜迟眼蕈蚊的越冬时间、抗寒能力及种群年动态变化规律进行了研究。结果表明:扬州市韭菜迟眼蕈蚊主要以4龄幼虫虫态、以韭菜鳞茎内为场所进行越冬,越冬起止时间为12月初至次年3月中旬;越冬之前、越冬前期、越冬中期,幼虫的过冷却点分别为-5.5、-6.6和-7.8℃,均低于当地当年冬季的月最低温度-3.5℃,表明韭菜迟眼蕈蚊在扬州市能顺利越冬;单层、双层棚内越冬幼虫的发育进度观察发现,越冬幼虫可顺利发育至成虫,表明扬州市韭菜迟眼蕈蚊以休眠方式越冬。扬州市韭菜迟眼蕈蚊成虫在3—6月、9—11月中旬各有3个高峰,夏季虫量较少。
In order to find out the habit of overwintering and the population dynamics of Bradysia odoriphaga Yang et Zhang in Yangzhou City, we studied the overwintering time of B. axyridis in Chinese chive field of Hangji town, Yangzhou from 2014 to 2015 , Cold tolerance and annual dynamics of population dynamics were studied. The results showed that the larvae of Leek larvae in Yangzhou were mainly live in the 4th instar larvae and overwintered in the leek bulbs. The beginning and ending time of overwintering was from the beginning of December to the middle of March of the following year. Before overwintering, overwintering, Of subcooling points were -5.5, -6.6 and -7.8 ℃, respectively, which were lower than the local monthly minimum temperature of -3.5 ℃ in winter, indicating that Leek larvae can win overwintering in Yangzhou City; Single and double shelves Overwintering larvae developmental progress observed found that overwintering larvae can be successfully developed into adults, indicating that Yangzhou leek larval Myospaga mosquitoes wintering way to wintering. Yangzhou leek larvae of adult mosquitoes in March-June, 9-11 mid-September each have three peaks, less summer insects.