![]() The postemergence herbicide sulfosulfuron was the least injurious to seashore dropseed. Although all pre-emergence herbicides (except table salt) exhibited acceptable weed control ratings, only oxadiazon and oxyfluorfen showed exceptional weed control and safety. Crop response to postemergence herbicides aminopyralid (1.10 lb/acre a.i.), triclopyr (3.0 lb/acre a.i.), a prepackaged mix of carfentrazone + (4-chloro-2-methylphenoxy)acetic acid + mecoprop + dicamba (0.02 + 1.11 + 0.22 + 0.11 lb/acre a.i.), and sulfosulfuron (0.06 lb/acre a.i.) applied at 70 and 98 DAT included visual foliar injury ratings and aboveground biomass accumulation at 28 DAH2. Preemergence weed control with crop response measures as visual foliar injury ratings and aboveground biomass accumulation were recorded 38 days after the second application of herbicides (DAH2). Dithiopyr (0.25 and 0.50 lb/acre a.i.), trifluralin + isoxaben (2.0 + 0.5 and 4.0 + 1.0 lb/acre a.i.), oxyfluorfen (0.25 and 0.50 lb/acre a.i.), oxadiazon (2.0 and 4.0 lb/acre a.i.), and granular table salt (99% sodium chloride, 1% sodium silicoaluminate 83% of particles 0.5–0.25 mm in diameter, 400 lb/acre a.i.) were applied at 2 and 84 days after transplanting (DAT). Seashore paspalum turf bleaching from mesotrione and topramezone can be reduced with the addition of metribuzin and/or ethofumesate to the tank mix.įield experiments were conducted to assess the tolerance of seashore dropseed (Sporobolus virginicus) to pre- and postemergence herbicides labeled for roadside right-of-way use. Applications of mesotrione did not result in goosegrass control. Maximum bermudagrass injury was seen in treatments with mesotrione (0.07 kg ha-1) and/or ethofumesate (1.12 kg ha-1). Incorporating a post-spray dry down allowed for complete control of goosegrass with one spray application. Goosegrass was controlled with tank mixes that included topramezone (0.01 kg ha-1) + metribuzin (0.10 kg ha-1) with an acceptable level of seashore paspalum discoloration. The herbicides metribuzin, topramezone, mesotrione, and ethofumesate were evaluated in tank mixtures for bermudagrass and mature goosegrass control and seashore paspalum injury. Herbicide efficacy studies were conducted at the West Loch Golf Course ('Salam' seashore paspalum, greens cut) on the island of Oahu in Hawaii. Bermudagrass and goosegrass are problem weeds infesting both fairways and greens on many seashore paspalum golf courses. And naturally, in unirrigated areas, we saw lots of bermudagrass, and very little seashore paspalum.Seashore paspalum has gained increased popularity in Hawaii due to its salt tolerance and the use of non-potable water on golf courses. In full sun at Honolulu we saw a lot of bermudagrass and much less manilagrass or carpetgrass. At Hilo, even in full sun, we saw a lot of carpetgrass and manilagrass and very little bermudagrass. There is a striking contrast in grass species performance between the relatively sunny climate at Honolulu (at right) and the much cloudier conditions at Hilo (top right). ![]() We saw what was growing in the sun, what was growing in the shade, what grows under irrigated conditions, and what grows where no irrigation is applied. ![]() transvaalensisīroadleaf carpetgrass, Axonopus compressus The species added up in a hurry! In just two days we saw: Thanks are due to Les Jeremiah, CGCS, who helped guide me to some of the most interesting turfgrass sites we visited fifteen distinct sites and made a quick survey of the grasses growing at each. I was recently at Hawaii to do some botanizing on the Big Island and on Oahu. The climate of the Hawaiian Islands is such that a tremendous variety of grasses can grow well and produce fine turfgrass surfaces.
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