Optimun rates of tank-mix combination of 2, 4-D dimethylamine and bensulfuron-methyl on control of scirpus grossus L.f

Abstract

The seeds of Scirpus grossus L.f were collected from rice fields at Nilam Puri, Kota Bharu, Kelantan. Dose-response experiment involving seedlings at 3 to 4-leaf stage in the greenhouse showed that the estimated ED50 of 2,4-D was only 1/18 the recommended application rate of 216 g a.i ha· 1 while estimated ED50 of bensulfuronmethyl was approximately 1/17 times recommended rate of 40 g a.i ha·