Abstract
Fourteen rice cultivars for forage use were compared for susceptibility to several herbicides in warm regions of Japan. Mizuhochikara, Momiroman and Ruriaoba were most sensitive to benzobicyclon and tefuryltrione, which are triketone herbicides including of 4-hydroxyphenylpyruvate dioxygenase (4-HPPD) inhibitor. These cultivars were bleached and killed by these herbicides in a standard dose, while they were less sensitive to other tested herbicides including pyrazolate, a pyrazole herbicide of 4-HPPD inhibitor. The other rice cultivars were less sensitive to all tested herbicides. Therefore, it is conducted that triketone herbicides with 4-HPPD inhibitor should not be used for the cultivation of Mizuhochikara, Momiroman and Ruriaoba in paddy fields of these areas.
