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杨树大斑溃疡病(Dothchiza populea Saccet Bridra)是杨树的一种危险性新病害,现已被列入我国森林植物检疫病害。据调查,在本溪及营口地区三年生沙兰杨发病率为8.1-30%,感病指数为5.6-20,死亡率4.2%;盖县西海林场“付杂2号”杨发病率达100%,感病指数为80。据了解,在黑龙江、吉林、内蒙等省(区) 也有不同程度的发生。为了寻求防治杨树大斑溃疡病的有效药剂,解决生产防治问题,我们于1984年在本溪县连山关林场三年生沙兰杨上做了一系列的室内外药效试验。现将其试验结果分述如下。一、室内药效试验1.供试药剂种类及浓度70%甲基托布津200、400、600倍,10%
Dothchiza populea Saccet Bridra is a dangerous new disease of poplar and has now been listed as a phytosanitary disease in our country. According to the survey, the incidence rates of three-year-old Sallans in Benxi and Yingkou were 8.1-30%, the susceptibility index was 5.6-20 and the mortality rate was 4.2%. The incidence rate of Yangfu 2 in Yanghai West Farm was 100% , The index of infection is 80. It is understood that in Heilongjiang, Jilin, Inner Mongolia and other provinces (regions) also have varying degrees of occurrence. In order to find an effective agent for preventing and controlling Poplar spot cataplasm disease and to solve the problem of production control, we conducted a series of indoor and outdoor pharmacodynamic tests in 1984 on the three-year-planted Salmonella yunnanensis forest in Benxi County. Now the test results are as follows. First, the indoor efficacy test 1. Test agents for the type and concentration of 70% thiophanate-methyl 200,400,600 times, 10%