Tolerance of Hooker's Evening Primrose (Oenothera elata) Transplants to Postemergence Herbicides

Amber N. Bates; Gerald M. Henry; Cynthia B. McKenney

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Tolerance of Hooker's Evening Primrose (Oenothera elata) Transplants to Postemergence Herbicides

机译：Tolerance of Hooker's Evening Primrose (Oenothera elata) Transplants to Postemergence Herbicides

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Greenhouse trials were conducted to determine Hooker's evening primrose transplant tolerance to POST-applied herbicides. Herbicide treatments consisted of glyphosate at 1.68 kg ae ha~(-1), glufosinate at 0.84 kg ai ha~(-1), fenoxaprop at 0.10 kg ai ha~(-1), fluazifop at 0.45 kg ai ha~(-1) + a nonionic surfactant (NIS) at 0.25 v/v, sulfosulfuron at 0.06 kg ai ha~(-1) + NIS at 0.25 v/v, quinclorac at 0.42 kg ae ha~(-1) + methylated seed oil (MSO) at 0.5 v/v, mesotrione at 0.21 kg ai ha~(-1), andthe combination of quinclorac + mecoprop + dicamba at 0.42 + 0.21 + 0.06 kg ae ha~(-1) + MSO at 0.5 v/v. Fluazifop (14) and fenoxaprop (19) treatments did not result in any significant phytotoxicity 7 d after treatment (DAT) compared with the nontreated check. Hooker's evening primrose exhibited 26 to 37 phytotoxicity in response to quinclorac, glyphosate, or sulfosulfuron 7 DAT. Phytotoxicity > 50 was observed for mesotrione, glufosinate, and the combination of quinclorac + mecoprop + dicamba 7DAT. Phytotoxicity increased for all treatments 28 DAT. Fluazifop (21 ) was the only treatment that did not exhibit phytotoxicity symptoms different from the nontreated check 28 DAT. Hooker's evening primrose exhibited 31 to 40 phytotoxicity with applications of fenoxaprop, glyphosate, or glufosinate 28 DAT. Phytotoxicity was > 58 with all other treatments 28 DAT. Fluazifop exhibited similar above-ground (12.4 g) and below-ground (16.4 g) biomass as the nontreated check (10.8 and 14.7 g, respectively) 28 DAT. All other treatments resulted in 1.6 to 5 g of above-ground biomass and 0.8 to 4.3 g of below-ground biomass 28 DAT. Fluazifop (24.3) and fenoxaprop (18.8) applications resulted in a plant growth index (PGI) that was not significantly differentfrom the nontreated check (24.7) 28 DAT. A PGI < 16.2 was observed for all other treatments 28 DAT.

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《Weed technology: A journal of the Weed Science Society of America》 |2013年第2期|401-404|共4页
作者
Amber N. Bates; Gerald M. Henry; Cynthia B. McKenney;
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作者单位

Dept. of Plant and Soil Science, Texas Tech University, Lubbock, TX 79409;

Dept. of Crop and Soil Sciences, University of Georgia, Athens, GA 30602;

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原文格式 PDF
正文语种英语
中图分类植物保护;
关键词
Biomass; oilseed crops; entals; phytotoxicity; plant growth index;

Tolerance of Hooker's Evening Primrose (Oenothera elata) Transplants to Postemergence Herbicides

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