Oregon buttercup weed killer9/8/2023 ![]() ![]() Since Bur buttercup starts growing early in the season, and reaches flowering in just a few weeks, the result is a very narrow window for the optimum management of this plant. No matter the preferred management method: tilling, pulling, herbicide application, burning (where allowed)- every management method for this invasive weed works best when applied before flowering. Sources vary as to the amount of plant that must be consumed to cause sickness: like many members of the Buttercup/ ranunculus family, Ranunculaceae, Bur buttercup contains alkaloid compounds that are not good for animals. However it’s possible for grazing animals to encounter Bur buttercup in free range situations, home pastures that may be less tightly managed, and the like. In well managed pastures, Bur buttercup doesn’t usually become a problem: it prefers dry, disturbed sites, and doesn’t compete well against pasture crops. It’s also possible that some seed is distributed via feeding by birds. ![]() In the eastern US, where the plant is far less frequently encountered, patches of Bur buttercup are usually associated with campsites. Hitchhiking skills Like small hooks, the seed-containing burs that give this plant its name attach to shoes, pets, livestock, and camping equipment. The combination of early growing plants and high seed production can lead to large, dense patches of Bur buttercup that become difficult to manage. The seeds remain viable for at least a few years: some sources suggest as many as twenty. As the seeds mature, the burs dry into a tough protective package that floats in water, blows in the wind, and irritates tender feet. Each flower develops into a swollen “bur”, complete with prickles, and containing anywhere from five to eighty seeds. These sneaky plants have completed most of their growth cycle before most people are spending much time in their yards. This goes largely unnoticed by many gardeners, as the plants grow only up to about five inches tall, and are easily hidden within grass or other plants. Seed development begins within days of flowering. The plant begins flowering within three weeks of emerging from the soil- much more quickly than most familiar ornamental plants. ![]() Bur buttercup starts actively growing as soon as temperatures reach the 40’s and 50’s. Insights into these same features- life cycle, growth habits, and reproductive strategies- are also key to its management.Ĭool season sneaky. The life cycle, growth habits, and reproductive strategies of this introduced plant have enabled it to invade the US northwest. Research shows, however, that prickly seed heads are just one of the ways this plant can be frustrating. The “burs” that give this flower its common name are often what drive inquiries to the Extension office about this plant. Because the seed pods persist long after the plants are done growing, they create discomfort for barefoot kids and animals in the yard. Both the common and scientific names of the plant (Bur buttercup and Ceratocephala testiculata) refer to the prickly seed pod that develops after flowering. Soon after, calls to the Extension office begin: what is it? How can I get rid of it?īur buttercup, a minute member of the Ranunculus family, is not desired in yards like its ornamental cousins. Remarks Avoid drift to sensitive crops and desirable vegetation.Early in spring, before temperatures in the Klamath Basin warm to allow significant outdoor gardening, a prickly, yellow-flowered invader is infiltrating our lawns, pastures, and road edges. Time Apply when the buttercup is growing well. Site of action (diflufenzopyr) Group 19: inhibits indoleacetic acid transport (dicamba) Group 4: synthetic auxinĬhemical family (diflufenzopyr) Semicarbazone (dicamba) Benzoic acid Do not exceed 10 oz/A of Overdrive per season. Remarks For improved uptake if weeds are under moisture or temperature stress, use a nonionic surfactant or a methylated seed oil.Ĭaution Do not plant any crop within 30 days of application. ![]() Site of action (aminocyclopyrachlor) Group 4 synthetic auxin (chlorsulfuron) Group 2: ALS inhibitorĬhemical family (aminocyclopyrachlor) Pyrimidine carboxylic acid (chlorsulfuron) Sulfonylurea Can injure several grass species including bromes, as well as basin wildrye. Can be applied using an invert emulsion rather than water.Ĭaution Even low rates can kill nontarget tree and shrub species, so avoid application within a distance equal to the tree height of the sensitive species. Remarks Adjuvants can be used these include methylated seed oils 0.5 to 1% v/v, nonionic surfactants at 0.25 to 1% v/v, and crop oil concentrates at 1% v/v. Time Apply to actively growing vegetation. Rate 1.2 to 1.8 oz/A aminocyclopyrachlor + 0.5 to 0.7 oz/A chlorsulfuron (3 to 4.5 oz/A of product) Aminocyclopyrachlor + chlorsulfuron (Perspective) ![]()
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