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由于过去在抗病育种工作中未把白粉病列入主要病害防治,以致省内现有推广良种如郑引一号、7023、百农3217、郑州761等都缺乏抗白粉病的抗源,在高肥水地区和部分稻茬麦田往往发病十分严重,对产量威胁很大.近几年,大面积推广了1000倍托布津与0.5度石硫合剂,但效果不十分理想.为了进一步寻找对小麦白粉病具有长效内吸杀菌剂,1981年进行了此项试验研究,现将初步结果分述如下:一、毒力测定(一)供试药剂:75%十三吗啉乳油(西德制),60%十二吗啉乳油(广州化工研究所试制),70%托布津可湿性粉(日本制).(二)试验方法:将三种药剂配成五种不同浓度的药液,分别渗入2%水洋菜培养基内,用平板法作成厚度均匀大小相等的琼
Due to the fact that powdery mildew was not included in the prevention and control of major diseases during the breeding of disease resistance in the past, the existing improved varieties in the province such as Zhengyin No.1, 7023, Baiyong 3217 and Zhengzhou 761 lack the resistance to powdery mildew. High-fertility areas and some rice fields are often very serious incidence of wheat fields, a great threat to yield.In recent years, a large area to promote the 1000 times Topaz and 0.5 degrees stone sulfur mixture, but the effect is not very satisfactory.In order to further find the wheat flour The disease has a long-acting systemic fungicide, 1981 carried out this pilot study, the preliminary results are as follows: First, the determination of virulence (A) for the test agent: 75% tridemorph morpholine cream (West Germany) , 60% dodemorphine EC (trial by Guangzhou Institute of Chemical Industry), 70% Topaz wettable powder (made in Japan). (II) Test Method: The three medicaments were dosed into five different concentrations of medicinal solution, 2% Aqua culture medium, using the plate method to make the uniform thickness of the same thickness of Joan