A new selective herbicide fenquinotrione was discovered and is being developed by Kumiai Chemical Industry Co., Ltd., K-I Chemical Research Institute Co., Ltd. and Ihara Chemical Industry Co., Ltd. for use in rice and other crops. Fenquinotrione controls a wide range of sedges and broadleaf weeds with residual activity, and it provides exceptional rice safety in any rice production system. Fenquinotrione inhibits HPPD (4-hydroxyphenylpyruvate dioxygenase) enzyme and disrupts carotenoid synthesis in susceptible weeds, therefore it works well to control ALS (Acetolactate synthase) resistant weeds which are widely spread in rice production areas. Greenhouse trials were conducted to determine herbicidal activity of fenquinotrione against several weed species includes ALS resistant weeds applied pre and post-emergence transplanted and/or dry-seeded condition. Efficacy and crop safety were assessed at 21 to 40 days after treatment. Fenquinotirone exhibited excellent efficacy against Monochoria, Cyperus, Amaranthus species and other weeds both pre-emergence and early post-emergence at 125 to 250 g a.i./ha. It also provided outstanding weed controls on 5 to 6 leaf stage of Cyperus difformis, Cyperus iria and ALS resistant Fimbristylis miliacea at 125 g a.i./ha under dry-seeded condition. Enough crop safety margin were observed at 1,000 g a.i./ha both on transplanted Japonica type rice cv. Kinmaze and on dry-seeded Indica type rice cv. Suphanburi No. 1. Fenquinotrione exhibits excellent weed control on sedges and broadleaf weeds with excellent crop safety and residual activity in rice. This new chemical technology can contribute to manage trouble-some weeds include ALS resistant weeds and it offers new opportunities and advantages for weed management in rice production globally.

Fenquinotrione: A new herbicide for weed control in rice

248th National Meeting (2014)

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