菜蔬의 連作障害에 關한 硏究 : I.菜蔬連作障害實態 I. Present Status of Soil Sickness in Continuous Vegetable Cropping = Studies on Soil Sickness in Vegetable Crops

다국어 초록 (Multilingual Abstract)

Present status of soil sickness in continuous vegetable cropping was investigated by means of interviews and field surveys. Investigations were made major vegetable crops such as Chinese cabbage, radish, red pepper, garlic,cucumber and others in the field or in the plastic house where a known vegetable crop was cultivated continuously for a long period.
1. In Chinese cabbage both for summer and autumn crops, bacterial soft rot was the most destructive one and followed by club root, root rot and boron deficiency in that order.
2. No serious soil sickness was generally observed in certain root crops such as radish and carrot except that root knot of carrot in Cheju. However,radish was damaged occasionally by Fusarium yellows and boron deficiency.
3. In general,Phytophthora rot and bacterial wilt were severe in red pepper, while nematode damages and bacterial canker occurred in a limited area.
4. With cucurbits,cucumber,muskmelon,and watermelon, although Fusarium wilt and stem blight were severe, those could be controlled by grafting Powdery mildew, grey mold and downey mildew occurred freqeuntly in the plastic house.
5. There were almost free from soil sickness problems in bulbous vegetable crops, garlic, onion and shallot. However root mite damage of shallot was severe and percentage of garlic blight has increased as increasing continuous cropping period with poor cultural practices.
6. Strawberry has damaged greatly by Fusarium yellows with incrcasing bud blight and that the cultivation is shifting toward the disease free land.
7. In lettuce, Sclerotinia soft rot, downey mildew and bacterial soft rot were prevalent and marginal leaf spot caused by Pseudomonas species on heading lettuce was severe in some areas.
8. There were severe damages of peanut due to root knot and Cercospora leaf spot while occasionally bacterial soft rot, and deficiencies of calcium and boron were observed in celeries.