Chemical Control of Sayanuka-gusa (Leersia Sayanuka Ohwi)
1976 Volume 21 Issue 1 Pages 26-30
Details
1976 Volume 21 Issue 1 Pages 26-30
This study was conducted to establish the chemical control method of Sayanuka-gusa, on which bacterial leaf blight of rice plant (Xanthomonas oryzae Dowson) is parasitic in winter season. The results obtained are summarized as follows.
1. Liquid formulation of glyphosate [N-(phosphonomethyl) glycine] gave the excellent control of Sayanuka-gusa. Both water soluble powder and granule of DPA (2, 2-dichloropropionic acid) were also feasible for the control. However, in the case of spring treatment, additional application of paraquat (1, 1′-dimethyl-4, 4′-bipyridinium ion) is required one month after DPA treatment.
2. For the good control of the weed, the herbicide application is preferable either in spring after the sprouting of Sayanuka-gusa or in autumn before withering. It is not appropriate to treat the herbicides during irrigation period in paddy field since crop injury might occur.
3. A 1/100 glyphosate solution or 1/40 DPA solution can be applied from 500 to 1, 000 liter per hectare by high volume sprayers. DPA formulated as granular is spread onto the community of Sayanuka-gusa at rates of 100 to 150kg per hectare.
