小麦吸浆虫寄生蜂混合种群发生与数量消长研究

Studies on the Population Occurrence and Dynamics of Parasitic Wasp of Wheat Blossom Midges

初步查明在陕西麦区寄生小麦吸浆虫的寄生蜂有１２种。其中，寄生麦红吸浆虫（ＳｉｔｏｄｉｐｌｏｓｉｓｍｏｓｅｌａｎａＧｅｈｉｎ）的５种，寄生麦黄吸浆虫（ＣｏｎｔａｒｉｎｉａｔｒｉｔｉｃｉＫｉｒｂｙ）的４种，２种吸浆虫均寄生的３种。寄生蜂具隔年出土习性。其田间羽化数量白天多于晚上。吸浆虫种群变动和农药使用是影响寄生蜂种群的２个主要因素。麦红吸浆虫寄生峰有２个高峰，第一峰紧随吸浆虫成虫高峰之后，第二峰在吸浆虫初龄幼虫期。麦黄吸浆虫寄生峰高峰只有一个，比吸浆虫成虫高峰晚２～４ｄ。

The studies indicated that there are 12 species of parasitic wasp which parasite wheat blossom midges in Shaanxi province, 5 species of which parasite Sitodiplosis mosellana Gehin, 4 species parasite Contarinia tritici Kirby and 3 species parasite the two species of wheat blossom midges. The parasitic wasps can stay in soil for several years if the condition is not sutible for them. The occurrence of parasitic wasp is more in day than at night. The population dynamic of wheat blossom midges and the use of pesticides are the two factors that affect the population of parasitic wasps. Parasitic wasps of S. mosellana have two picks. The first one is just after the pick of S. mosellana adult and the second one at the stage of S. mosellana small larvae. The parasitic wasps of C. tritici have only one pick, which is 2￣4 days after the pick of C. tritici adult.