Red rice (Oryza sativa) biology. II. Ecotype sensitivity to herbicides

• Published in: Weed technology 1999-01, Vol.13 (1), p.19-24
• Main Authors: Noldin, J.A, Chandler, J.M, Ketchersid, M.L, McCauley, G.N
• Format: Article
• Language: English
• Subjects: application methods; application rate; Biological and medical sciences; biological resistance; Biology; Chemical control; crop plants as weeds; Crop science; Crops; cultivars; ecotypes; fenoxaprop; fluazifop-P; foliar application; Fundamental and applied biological sciences. Psychology; Genotypes; glufosinate; glyphosate; herbicide mixtures; Herbicide resistance; herbicide-resistant weeds; Herbicides; imazethapyr; molinate; Oryza sativa; paraquat; Parasitic plants. Weeds; Phytopathology. Animal pests. Plant and forest protection; Plant growth; Plants; quizalofop; Rice; Seeds; sethoxydim; thiobencarb; weed control; Weeds
• ISSN: 0890-037X; 1550-2740
• DOI: 10.1017/S0890037X00044845

Greenhouse studies were conducted to evaluate sensitivity of red rice ecotypes from Arkansas, Louisiana, Mississippi, and Texas to soil- and foliar-applied herbicides. Ecotype response to herbicides was variable. Molinate at 4.48 kg ai/ha controlled red rice ecotypes 92 to 100% and cultivars 'Lemont,' 'Mars,' and 'Maybelle' 39 to 63%. Red rice control with thiobencarb at 4.48 kg ai/ha was at least 89%. The tank mixture of fenoxaprop at 0.08 kg ai/ha plus fluazifop-P at 0.10 kg ai/ha controlled red rice and rice cultivars more than for either herbicide applied alone. Red rice and rice cultivar control with paraquat at 0.70 kg ai/ha was 83 to 100%. Blackhulled red rice TX 4 was less sensitive to paraquat and glufosinate than other ecotypes and cultivars. Glufosinate at 1.12 kg ai/ha was required to provide at least 94% control of ecotype TX 4.