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接种测定表明,辣椒疫菌(Phytophthora capsics L.)除侵染葫芦科的12种作物外,还可侵染棉苗、荞麦苗等。在培养条件下,其菌丝在10℃下可以生长,25—30℃生长最好,37℃时不生长,有的菌株在4℃左右低温下保存20—38天便失去活性。它在燕麦琼脂、菜豆粉琼脂和蔬菜汁琼脂培养基上易产生孢子囊,且在蔬菜汁琼脂和莱豆粉琼脂培养基上形成卵孢子较多。有的菌株随移植次数增多和保存时间延长,致病性便明显降低或丧失。它在土壤溶液和Petri溶液中6h就可形成孢子囊,24h达大量,故大水漫灌、深灌积水,或较长时间降雨,或中量雨前后灌水,或灌水后又跑水造成重灌等,均利于辣椒疫病暴发。
Inoculation assays showed that Phytophthora capsici (L.) could infect cotton seedlings, buckwheat seedlings and the like in addition to the 12 crops of Cucurbitaceae. Under culture conditions, the mycelium can grow at 10 ℃, the best growth at 25-30 ℃, no growth at 37 ℃, and some strains lose their activity after 20-38 days storage at low temperature of 4 ℃. It is oat agar, bean floss agar agar and vegetable juice agar medium is easy to produce sporangia, and vegetable juice agar and lentil flour agar medium more oospores. Some strains with the increase in the number of transplants and storage time, pathogenicity was significantly reduced or lost. It can form sporangium in soil solution and Petri solution for 6h, reaching a large amount at 24h, so flood irrigation, deep filling water, or rainfall for a long time, or irrigation before or after rainfall, or running water after irrigation Irrigation, etc., are conducive to the outbreak of pepper disease.