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我场原系柑桔良种苗木繁育基地。1965年秋,柑桔幼苗出现了溃疡病,经采取防治措施后,20多年来,未再发现该病的感染。1 发病情况我场柑桔溃疡病,是由购进接穗所传染。4年中,发病面积占总苗圃面积的88.9%,
My field original citrus seedling breeding base. In the autumn of 1965, ulcer disease appeared in citrus seedlings. After taking control measures, no infection of the disease was found for more than 20 years. An incidence of my citrus canker disease is infected by the purchase of scion. 4 years, the incidence of the area accounted for 88.9% of the total nursery area,