Influence of Growth Stage and Herbicide Rate on Postemergence Johnsongrass (Sorghum halepense) Control
| Autor: | James M. Chandler, Eric P. Prostko, Scott A. Senseman, Enrique Rosales-Robles |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
0106 biological sciences
biology 04 agricultural and veterinary sciences Plant Science Pesticide Weed control Sorghum biology.organism_classification 01 natural sciences Rhizome 010602 entomology Horticulture Seedling Botany 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Poaceae Weed Alkanoic acid Agronomy and Crop Science |
| Zdroj: | Weed Technology. 13:525-529 |
| ISSN: | 1550-2740 0890-037X |
| DOI: | 10.1017/s0890037x00046145 |
| Popis: | Studies were conducted to observe the effect of full and reduced rates of postemergence (POST) herbicides on seedling and rhizome johnsongrass (Sorghum halepense) at different growth stages. Herbicides and labeled rates included primisulfuron at 40 g/ha, nicosulfuron at 35 g/ha, fluazifop-P at 210 g/ha, and clethodim at 140 g/ha. Contour graphs to predict johnsongrass control at different growth stages and herbicide rates were developed. Excellent seedling and rhizome johnsongrass control was obtained with reduced rates of herbicides applied at the three- to five-leaf stages. Primisulfuron at 20 g/ha resulted in 90% or greater control of seedling johnsongrass in the three- to four-leaf stage. Rhizome johnsongrass at this growth stage required 30 g/ha of primisulfuron for the same level of control. Nicosulfuron at 17.5 and 26.3 g/ha provided 90% or greater control up to the four-leaf stage of seedling and rhizome johnsongrass, respectively. Fluazifop-P and clethodim were more effective than primisulfuron and nicosulfuron. Fluazifop-P at 105 g/ha resulted in 90% or greater control of seedling and rhizome johnsongrass up to the seven- and five-leaf stages, respectively. Clethodim at 35 g/ha controlled seedling johnsongrass at least 90% up to the eight-leaf stage. Clethodim at 70 g/ha provided 90% or greater control of rhizome johnsongrass if applied at the three- to four-leaf stages. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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