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甘肃省辣椒疫病发生严重,天水地区及兰州市发病面积高达70％～80％。1988年对该病进行了病原菌的分离鉴定,从分离的菌株中选取7株作进一步研究,比较了菌落形态、菌丝直线生长速度、最高生长温度。无性孢子囊变异性大,平均25.1～36.8μm,长宽比1.4～1.6:1,乳突明显(2.7～3.1μm),偶见双乳突。藏卵器球形,大小28.3～33.9μm×26.3～32.7μm。雄器大小13.5～14.9μm×9.0～11.5μm。卵孢子大小23.6～27.4μm。有性繁殖和Phytophthora capsici A_1及A_2标准菌株相配能产生有性孢子,但自交不孕。供试菌株对孔雀石绿不敏感,同时能利用淀粉作为碳源,50ppm恶霉灵对供试菌株仅有轻微抑制作用。根据上述,甘肃省辣椒疫病菌初步定为P.capsici。经室内药效测定以瑞毒铜1000倍,大富丹1000倍及杀毒矾M81000倍最佳。
The occurrence of pepper blight in Gansu province is serious, with the incidence of 70% -80% in Tianshui area and Lanzhou city. In 1988, the pathogen was isolated and identified. Seven strains from the isolated strains were selected for further study. The colony morphology, the linear growth rate of mycelium and the maximum growth temperature were compared. Asexual sporangia large variability, an average of 25.1 ~ 36.8μm, aspect ratio of 1.4 ~ 1.6: 1, mastoid obvious (2.7 ~ 3.1μm), occasionally double mastoid. Ovarium spherical, size 28.3 ~ 33.9μm × 26.3 ~ 32.7μm. Male size 13.5 ~ 14.9μm × 9.0 ~ 11.5μm. Oospore size 23.6 ~ 27.4μm. Sexual reproduction and Phytophthora capsici A_1 and A_2 standard strains can produce conidia, but self-fertility. The test strains were not sensitive to malachite green, at the same time can use starch as a carbon source, 50ppm hymexazol only slight inhibition of the tested strains. According to the above, Gypsum capsici initially set P.capsici. The indoor efficacy measured to Rui Tong Cu 1000 times, Dafan 1,000 times and anti-virus alum M81000 times best.