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1.螟卵啮小蜂Tetrastichus schoenobii Ferriere在广西分布普遍,北至全州,南至合浦、钦州,西至那坡、靖西、龙州,均有发生,但发生量有逐年减少的趋势。 2.广西的螟卵啮小蜂有几个不同的寄主来源,除三化螟外,还有荸荠白螟、蓆草白螟、莎草白螟等。这几种不同寄主来源的螟卵啮小蜂在室内可以用上述四种螟卵交互培养繁殖。 3.在室内饲养情况下,螟卵啮小蜂一年可以繁殖14～15代。主要以老熟幼虫过冬。 4.螟卵啮小蜂的成虫飞翔力颇强,有趋光性。其寿命因气候条件不同和有无补充营养而有异,夏秋期间寿命较短,冬春季节寿命较长。冬期世代用蜜糖水饲养时,平均寿命约22天。成虫一般在交配后24小时内即可产卵;也能孤雌生殖,但子代均为雄性。幼虫能咬食多个寄主卵粒,通常一三化螟卵块有10个以上螟卵啮小蜂幼虫时,该卵块多不能孵化蚁螟。啮小蜂幼虫多在寄主卵块内化蛹,但当寄主卵块被雨水浸淋、湿度过高时,老熟幼虫可爬出寄主卵块外化蛹。 5.经在室内用大指形管、蜂箱和大养虫笼饲养考查表明,三化螟卵的和白螟卵的啮小蜂对三化螟卵的寄生率均较高,两者无差异。但田间放蜂试验的初步结果表明,两种不同来源的啮小啮对三化螟卵的寄生率均不高,尚不能说明问题。
1. Tetrastichus schoenobii Ferriere is widely distributed in Guangxi, north to the state, south to Hepu, Qinzhou, west to Napo, Jingxi, Longzhou, but the occurrence of the trend has decreased year by year. 2. Bivalve Owl in Guangxi There are several different sources of the host, in addition to the three borers, there are water chestnut white borers, Ivy grass borer, sedge white borer and so on. These different host origin Borerworm beetles indoors can use the four kinds of borer eggs interactive breeding. 3. In the case of indoor feeding, Bombycidae bee can multiply 14 to 15 generations a year. Mainly larvae mature winter. 4. Bombyx beetles Adult flying insects quite strong, phototaxis. Its life is different due to different climatic conditions and with or without nutritional supplements, shorter life span in summer and autumn, longer life span in winter and spring. Winter generation with honey water feeding, the average life expectancy of about 22 days. Adults generally spawn within 24 hours of mating; also parthenogenetic, but offspring are male. Larvae can bite a number of host eggs, usually more than 10 stem borer eggs have more than 10 eggs borer larvae, the egg can not hatch the ants more. The larvae of the wasps mostly pupate in the host egg mass, but when the host egg mass is leached by the rain water and the humidity is too high, the mature larvae can crawl out of the pupae of the host egg mass. 5. Indoor indoors with large finger tubes, beehives and large carcasses cage examination showed that the rice stem borer and white borers egg bees on the stem borer eggs parasitism were higher, there was no difference between the two . However, the preliminary results of the field bee-booming test showed that the parasitic rates of the two different sources of the rodent rodents on the eggs of the rice stem borer (Bombye Centhati) were not high, which still can not explain the problem.