论文部分内容阅读
近几年来,城郊蔬菜基地的茄果类蔬菜苗期猝倒病发生面广,且呈逐年加剧趋势,必须引起注意。 茄果类蔬菜猝倒病的菌原体在适宜条件下,不但侵害茄果类蔬菜,而且危害黄瓜、南瓜、西瓜、甜瓜等。由于茄果类蔬菜苗期幼原基组织细嫩,加之春季雨水偏多,棚栽或大田土壤湿度过大,幼苗极易被猝倒病的菌原体侵害。发病初期植株近土面的茎部呈水渍状病斑,病斑很快扩大并绕幼茎一周,病部缢缩成线状继而折倒。特别是病区,当气温在16～18℃、田间土壤含水量超过40％的条件下蔓延很快,幼苗成片猝倒,造成严重缺株断垄。对此病应重视做好预防工作。预防措施有四条:
In recent years, suburban vegetable base of eggplant vegetables seedling damping-off disease occurs a wide range, and showed an increasing trend year by year, we must attract attention. Solanaceae vegetable damping-off of the bacterial pathogens under appropriate conditions, not only against solanaceous vegetables, but also harmful cucumber, pumpkin, watermelon, melon and so on. Because the solanum vegetable seedling young primordial base tissue tender, coupled with the spring rainfall is too much, shed or field soil humidity is too large, seedlings easily bruised down the pathogen mycoplasma invasion. Early onset of plant near the soil surface of the stem was water stain-like lesions, lesions quickly expanded and around the young stem a week, the Department of disease shrinking into a linear and then fold down. Especially ward, when the temperature is 16 ~ 18 ℃, field soil moisture content of more than 40% spread rapidly, seedlings into a film cataplexy, resulting in serious lack of broken line ridge. The disease should pay attention to prevention. There are four precautionary measures: