| Abstract/Contents: | Hand mowing and trimming of grasses around fences and structures can be time consuming and expensive. Fifteen studies, over a four-year period, were initiated from May through September to evaluate herbicides for total grass control. To determine residual effectiveness, control was recorded over a several month period. Some studies were located under cyclone fencing while others were on grassy slopes. To determine if herbicides would move or wash out of treated areas, the amount of grass kill outside these areas was measured. The downhill side of plots on the slopes (8 to 21%) was used for measurements while both sides were used for plots under the cyclone fencing. Plots measured 8 inches to 3 feet wide and 5 to 10 feet long and were replicated three to six times. The turfgrass stand in the fence areas contained Kentucky bluegrass with some red fescue and colonial bentgrass. On the slopes the grass stand consisted of tall fescue, Kentucky bluegrass, quackgrass, orchardgrass, red fescue, etc. The herbicides, rates and results of the tests are presented in Table 1. Although there was some variability in the results from one test to another and some herbicides were used in but a few trials, the data suggests the following results: (1) good grass control with residual effectiveness for up to a 3-month period was obtained with glyphosate, karbutilate, paraquat and a mixture of PCP plus prometon with the latter two treatments being quick acting, (2) good control for possibly up to 6 months was obtained with amitrole plus simazine, bromacil, bromacil plus diuron, diuron, hexazinone, DPX-233 and DPX-310 and (3) good control for up to 12 months was obtained with prometon plus simazine+ and tebuthiuron. The experimental material, DPX-5648, provided good results for up to 3 months and residual data will be recorded in 1981 as it will be for several glyphosate combination treatments. Fair grass control was obtained with dalapon, DPX-4065 and simazine while poor results were provided by ametryne, AXF-1060, cacodylic acid, DPX-4189 and R-40244. The experimental material DPX-4189 appeared promising for selective broadleaf weed control. There was evidence of chemical movement or washing from treated plots. The following herbicides, listed in the order of most to the least, showed a potential for movement: karbutilate, hexazinone, bromacil, tebuthiuron and the mixture of prometon plus simazine+. |
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