Herbicides for Renovation of Pastures and Control of Tall Ironweed ( Vernonia altissima )
1979; Cambridge University Press; Volume: 27; Issue: 3 Linguagem: Inglês
10.1017/s0043174500044143
ISSN1550-2759
Autores Tópico(s)Plant and fungal interactions
ResumoAugust and October applications of glyphosate [ N -(phosphonomethyl)glycine] and paraquat (1,1′-dimethyl-4,4′-bipyridinium ion) were compared at two rates for pasture renovation. During the 2 yr of the experiment, sod suppression was frequently greater with October applications than with August applications. Medium red clover ( Trifolium pratense L.) became established in all the plots, and density and yield tended to increase as grass suppression increased. Glyphosate was compared over a 3-yr period with an ester of 2,4-D [(2,4-dichlorophenoxy)acetic acid] and picloram (4-amino-3,5,6-trichloropicolinic acid) for control of tall ironweed ( Vernonia altissima Nutt.) when applied in August. Picloram killed from about 80 to 100% of the tall ironweed plants and was superior to 2,4-D. Glyphosate was inconsistent for controlling tall ironweed but could be used for killing perennial weeds as well as sod suppression.
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