(23(3):204-211)FIELD DISEASE SURVEY AND CONTROL ON STEM BLIGHT OF GREEN ASPARAGUS

1.為明暸綠蘆筍發生之病害及有效防治藥劑，特進行此項調查及試驗工作。 2.綠蘆筍病害以莖枯病為最嚴重，其次是褐斑病，間有萎凋病發生。 3.莖枯病的發病率在80%以上，被害程度在2.50以上，以每年七、八月及十二、一月為害最為嚴重，嚴重病株之病斑數在100個以上。 4.褐斑病的發病莖率在60%左右。 5.由藥劑試驗結果，以Difolatan（預防率：100 p.p.m為80.95%，200 p.p.m為83.33%)，Benlate（預防率：100 p.p.m為85.71%，200 p.p.m為92.85%），Orthocide（預防率：100 p.p.m為71.42%，200 p.p.m為73.80%），三種藥劑對莖枯病之防治效果最佳，但預防率未達百分之百，其他藥劑之防治效果不佳，故仍需進一步尋求安全、有效之防治藥劑，以供今後筍農防治莖枯病之依據。 In order to understand the occurred diseases of green asparagus and the effective fungicides to control the main disease, we especially process on this experimental work. In the green asparagus field, the severest disease is Stem Blight, the next is Brown Spot. Some Fusarium and Pythium Wilt disease also can occur in it. The percentage of disease in Stem Blight is over 80%, the degree of disease is over the index 2.50. July, August and December, January in every year is the severest season. And the lesion number of severest diseased stem is over 100, the percentage of disease in Brown Spot is around 60%. From the result of fungicide test, we know the Difolatan, Benlate and Orthocide are the more effective for controlling Stem Blight, but the percentage of prevention don’t reach the perfect effect. The effect of other fungicides is not good. So we must continue to work to searcll for safe, and ideal fungicides as the index of prevention