1.甘藷品系對簇葉病感病性嫁接試驗結果，第一批已罹病品系有臺農10號等73種。病徵分為A，B，C，D四型，不同品系之病徵有顯著之差異，可知其感病性亦有差異，由於品系間耐病性之測定可以選擇抗病性品種。
This paper reports the experimental results on varietal resistance. Eradication by thermotherapy and Host range of sweet potato witchs' broom in Taiwan were conducted at the Chiayi Agricultural Experiment Station from July, 1968 to June, 1969. The results are briefed as follows:
