TY - JOUR AU - González-Ibáñez, Jaime PY - 1986/07/01 Y2 - 2024/03/29 TI - Control by Several Herbicides on Alexander grass, Brachiaria plantaginea (Link) Hitchc., in the Greenhouse JF - The Journal of Agriculture of the University of Puerto Rico JA - JAUPR VL - 70 IS - 3 SE - Articles DO - 10.46429/jaupr.v70i3.7093 UR - https://revistas.upr.edu/index.php/jaupr/article/view/7093 SP - 207-211 AB - <p>Three experiments were conducted in the greenhouse to study the biology and the effectiveness of several herbicides on Alexander grass (<em>Brachiaria plantaginea</em>). The first experiment, designed to establish the length of stolons to be used in further experiments, showed that two-node runners (regardless of the size of the fragment) was the best planting material. In the second experiment the following herbicides were applied to plastic trays (20 cm x 20 cm x 23 cm) filled with soil and planted to <em>Brachiaria</em> runners (2 per tray) as a pre-emergence treatment: hexazinone [(3-cyclo-hexyl-6-(dimethylamino)-1- methyl-1,3,5-triazine-2,4(1H,3H)-dione)] at the rate of .5 kg/ha and 1 kg/ha; bromacil (5-bromo-3-sec-butyl-6-methyl-uracil) at the rates of 2 and 4 kg/ha; diuron [(3-(3,4-dichlorophenyl)-1,1-dimethylurea)] at the rate of 4 kg/ha; metribuzin [(4-amino-6-tert-butyl-3-(methylthio)-as-triazine-5(4H)-one)] at the rates of 2, 4 and 8 kg/ha; Krovar I (1:1 bromacil + diuron) at 4 kg/ha and Krovar II (.53 bromacil + .27 diuron) at 4 kg/ha; a combination of ametryn [(2- ethylamino-4-(isopropylamino)-6-methylthio-s-triazine] + atrazine [(2-chloro- 4-(ethylamono)-s-triazine] at 2 + 2 kg/ha; a combination of ametryn + metribuzin at 2 + 2 kg/ha. All individual herbicides and their combinations were highly effective in controlling the sprouting of the runners for a 2-month observation. In contrast, in the non-treated trays, runners sprouted 100%. In the third experiment, runners were pre-rooted in nontreated soil and transplanted to trays filled with soil treated 2 months before with the above mentioned herbicides were totally injured, and eventually killed after 30 days. Untreated runners developed under normal conditions up to 30 days.</p> ER -