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在过去几年大田放蜂治虫的实践中,发现防治效果除受蜂群素质、天气的影响外,还与防治对象田虫口密度(蛾量)的高低,蜂量的多少等有密切的关系。同时据外地介绍在总放蜂量相等的条件下,各次放蜂量的比例与效果也有较大的关系。为此,要提高赤眼蜂田间寄生率,就必须提高放蜂技术,摸索出一套经济有效的放蜂方法。1976年我们在二代稻纵卷叶螟发生期间进行了不同蛾量、不同放蜂量(简称蜂量)及不同蜂量比例(简称蜂量比)对防治效果影响的复因子试验,现将结果整理如下:
In the past few years in the field of beekeeping pest practice, we found that in addition to the control effect of bee colony quality, the weather, but also with the prevention and control of insect population density (moth amount) level, the amount of bee and so on are closely related. According to the introduction of the field at the same time the total amount of bee-eaters under the same conditions, the proportion of bee-eaters and the effect has a greater relationship. To this end, to increase the parasitic rate of Trichogramma field, we must increase the release of bee technology to explore a set of cost-effective way to put the bee. In 1976, we conducted a complex factorial experiment on the control effect of different numbers of moths, different numbers of bee-pollinators and different bee-pollen ratios on the second generation of C. medinalis. The results are organized as follows: