Confirmation of resistance Monochoria vaginalis (Burm. f.) C. Presl from West Java and Lampung Indonesia to bensulfuron-methyl herbicide

Abstract

Several national rice centers in Indonesia have used acetolactate synthase herbicide inhibitors for years, especially in several regions of Lampung and West Java provinces. This practice has led to the failure of the application of bensulfuron-methyl herbicide to control Monochoria vaginalis (Burm. f.) C. Presl. The purposes of this study were to confirm that the failure of herbicide application in several areas of the provinces of Lampung and West Java was caused by weed resistance, and to determine the level of resistance. A resistance test of M. vaginalis was performed using the whole plant pot test method and split plot design with three replications. Monochoria vaginalis which indicated resistance was sampled from several regions, namely Sapto Mulyo, Ramadewa, Sarijaya, and Kalentambo. The susceptible samples of M. vaginalis as a control were taken from Cibodas and Sumberagung. The six levels of doses of herbicide bensulfuron-methyl used were: 0, 80, 160, 320, 640 and 1,280 g ∙ ha–1. The experimental results show that M. vaginalis from Sapto Mulyo, Ramadewa, Kalentambo and Sarijaya was confirmed to have developed into weeds resistant to bensulfuron-methyl herbicide. Monochoria vaginalis from Saptomulyo, Kalentambo and Sarijaya were included in the high resistance category with a resistance ratio of more than 12, while M. vaginalis from Ramadewa was included in the moderate resistance category with a resistance ratio of 9.39.

Keywords

• resistance ratio
• rice
• weed