1) For the purpose of labor-saving of weeding in the planted forestry of Taiwan, tetrapione (Sodium-2, 2, 3, 3-tetrafluoropropionate) was tested in the forestry of Acacia confusa at Hengchun (Pingtong) and Pahsienshan (Hsinchu) in 1970.
2) Eulalia (Miscanthus sinensis), one of the most troublesome weeds in the forestry of Taiwan was satisfactorily controlled by the application of tetrapione. The optimum rate was approximate 4.5kg a. i. per hectare.
3) Growth of ferns, herbacious broad leaved weeds and shrubs in the tetrapione treated area increased compared with those in the untreated area. However, change of the vegetation due to the application of tetrapione did not give any bad influence on the growth of the planted trees, because those alternated weeds were not tall enough to shade the planted trees.
4) The results obtained in these tests indicated the feasibility of tetrapione in the forestry of Acacia confusa on which tetrapione did not show any symptoms of phytotoxicity.
