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近几年来,我县广大贫下中农和农业技术人员在防治水稻三化螟的实践中,总结出了二季晚稻在初见零星白穗时施药防治第四代三化螟白穗的经验。为了更好的总结推广这一经验,我们于1973年、1974年进行了一些试验和调查。 1973年我们在二季晚稻田里用分厢小桶泼浇法进行第四代三化螟防治试验。施药时间是在9月23日,这时水稻已80%破胸,20%抽穗,田内已出现零星白穗。用甲六粉每亩2斤,25%杀虫脒每亩0.5斤分别进行防治的结果:稻田白穗率分别压低到0.9%和0.1%,防治效果一般达95-99%,而对照(不施药)白穗率达10.3%。 据在海口五一五大队调查:1973年在二季晚稻苗情为10-20%破胸,虫情为卵块孵化初期,即9月12-15日进行药剂防治,结果是二季晚稻白穗率一般仍在1-3%,严重田块达10%左右。1974年药剂防治时期改在初见零星白穗后,即9月18-21日进行,结果是全大队二季晚稻白穗率压低到0.5%以下。 另据白杨公社六大队1974年调查,在初见零星白穗后2-3天内施药的田块,白穗率为0.1—0.8%,,而在初见零星白穗后10天左右施药的田
In recent years, the vast majority of poor and middle peasants and agricultural technicians in our county in the prevention and control of rice stem borer in the practice, summed up the late rice rice in the early sporadic white spike spraying fourth generation whitefly rice experience. In order to better summarize and popularize this experience, we conducted some experiments and surveys in 1973 and 1974. In 1973, we used the terminal bucket in the second quarter of the paddy pouring method for the fourth generation of three borer control trials. Application time is on September 23, when rice has broken chest 80%, 20% heading, the field has sporadic white spike. The results showed that the yield of white spike of paddy field was reduced to 0.9% and 0.1% respectively, the control effect was generally 95-99%, while the control (no Application) white spike rate of 10.3%. According to the investigation of Haikou May 5 Brigade: 1973 in the second season of late rice Miao Qing 10-20% Breast, insect conditions for early egg incubation, that September 12-15 for chemical control, the result is the second season late rice white spike rate Still 1-3%, serious field block up to 10%. In 1974 the period of prevention and treatment of pesticides changed initially in sporadic white spikes, that is, September 18-21, the result is the entire brigade second season late rice white spike down to 0.5% or less. According to the Sixth Brigade Poplar Commune survey in 1974, in the first sporadic white spike 2-3 days after the application of field plots, white spike rate of 0.1-0.8%, and in sporadic white spike about 10 days after spraying Field