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冬萝卜是新疆地区冬季的主要蔬菜,种植面积日益扩大。为了保证冬萝卜获得丰产,我们在八一农学院头屯河实习农场曾对冬萝卜黑心病作了如下的调查,现整理出来,供各地参考。 一、发生情况及症状:该场冬萝卜黑心病发现于1957年。冬萝卜一般在7月下旬到8月上旬播种,生长6-7片真叶后叶子开始发黄,并从外围向内蔓延,直到心叶。在叶子发黄的同时,叶面发生绉缩和卷曲。此时,地下部分的直径已生长到1.5厘米,生长速度显著变慢,但地上部份并不枯死。在发病之后根的
Winter radish is the main winter vegetables in Xinjiang, growing area planted. In order to ensure the winter radish to obtain high yield, we had a survey on the winter radish black heart disease in Tutunhe internship farm in August 1 Agricultural University. Now it is sorted out for reference. First, the occurrence and symptoms: The winter radish black heart disease found in 1957. Winter radishes are generally sowed in late July to early August, growing 6-7 true leaves leaves began to yellow, and inward spread from the periphery until the heart leaves. Leaves yellowed at the same time, the folds of the folds and curls. At this point, the diameter of the underground part has grown to 1.5 cm, the growth rate significantly slowed down, but the ground is not dead. After the onset of the root