Bur buttercup (Ranunculus testiculatus) is an exotic annual weed, native of southestern Europe that has become widespread in gardens, small grains, pastures, wastes areas, and along roadsides in the western USA. It is a winter annual that emerges, flowers, and sets fruits in the spring, when temperatures climb into the 45 to 50-degree range. It is a toxic species because it contains ranunculin, a chemical that changes into to protoanemonin, a highly toxic compound. The transformation of ranunculin into protoanemonin occurs when the plant is crushed. There are reports of sheep poisoning after ingesting bur buttercup.
It is important to control bur buttercup before they produce flowers and seeds. Hoeing, pulling and digging can control bur buttercup. They can be sprayed with 2,4-D, Ally, Banvel, Banvel + 2,4D, Finale, Liberty, or Roundup.
Categories: Weed, Bur Buttercup
Date: 04/14/2005