芦笋茎枯病是芦笋生产中常见病害,发病率一般为20%一30%,严重时可达60%以上。秋季田间植株成一片枯黄,以至枯死,严重威胁着芦笋的产量和品质。一、发病症状主要危害嫩茎和侧枝,也侵染叶和根盘。嫩茎和侧枝感病,最初出现水浸状针头大的小斑点,扩大后呈椭圆形,纺锤形或不规则褪绿斑,边缘稍肿胀,红色,外围具失绿的水浸状晕圈,中央微凹陷,渐变为灰白色,其上密生黑色小粒点;发病重时,常多个病斑汇合成长条斑或不规则形大斑,当病斑绕茎、枝时,其地上茎、枝叶即萎黄枯死,且易从此折倒。二、发病特点病菌主要以菌丝体,分生孢子器随病残体在田间或在病根盘上以及未腐熟沤肥中越冬;用染 Asparagus stem blight is a common disease in the production of asparagus, the incidence is generally 20% to 30%, in severe cases up to 60%. Autumn plant into a field of yellow, as well as dead, a serious threat to the yield and quality of asparagus. First, the main symptoms of disease endangering stems and collateral, also infected leaves and root plate. Young stems and collateral disease, the initial emergence of small needle-like spots of flooding, expanded to an oval, spindly or irregular faded green spot, the edge of a little swollen, red, the periphery with a greenish aquatic-like halo, Central micro-depression, gradual change to gray, dense black small particles on it; severe onset, often more than a combination of spots of plaque or irregular shaped big spot, when the lesion around the stems, branches, the above stems, branches and leaves that chlorosis Withered, and easy to fold from here. Second, the incidence characteristics of the main bacteria to mycelium, conidia with the disease in the field or in the diseased root disk and not rotten compost fertilizer overwintering; dye