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以往在田间调查中发现,凡稻飞虱发生重的田块,稻纹枯病的发生也相对较重。为明确飞虱是否能加重纹枯病的发生,1984年在土城乡大莒城村和蒋河村,作防治飞虱对纹枯病发生影响的试验观察。小区面积0.2～0.4亩,2～3次重复。为减少损失,供试田均于7月25日前后防治二代飞虱和纵卷叶螟,仅观察三代飞虱对纹枯病的影响,以不防治为对照。各试区从栽秧后不使用任何杀菌剂。大莒城村的供试品种为珍汕97A,三代防治区于8月14日每亩用200克20％杀虫脒+100克40％氧化乐果,兑水40公斤喷雾,8月23日
In the past, it was found in field surveys that the occurrence of rice sheath blight was relatively heavy even if the rice planthoppers were heavy. In order to find out whether planthopper exacerbated the occurrence of sheath blight, experimental studies on the effects of planthopper on sheath blight were conducted in Dayucheng Village and Jianghe Village, Tucheng Township in 1984. Area of 0.2 to 0.4 acres, 2 to 3 times repeated. In order to reduce the losses, the test fields were both on and after July 25 to prevent and control second-generation planthopper and leaf roller, only observed three generations of planthopper sheath blight, with no control as a control. The test area from the seedlings do not use any fungicides. The test varieties of the village for the Zhentou 97A, three generations of prevention and control area on August 14 with 200 grams per mu 20% chlordimeform + 100 g 40% omethoate, watered 40 kg spray, August 23