Considerations for breeding and developing forages to compete with weeds in the Intermountain West,USA
Downy brome (Bromus tectorum) and medusahead (Taeniatherum caput -medusae) are weedy annual grasses that are widely considered to be the most serious and threatening pests on rangeland in the Intermountain West, USA. These species have been highly successful because they are more effective at enduring stresses and acquiring resources than the perennial forage plants with which they compete. The objective of this research is to determine the characteristics that are critical in the breeding and development of forages in the Intermountain West to effectively compete with downy brome and medusahead. Experiments were conducted at six field locations in Nevada and California to test the response of newly seeded and established forage species to annual grass competition and herbicides. Some perennial grasses were more susceptible to herbicide injury than others. These differences were primarily observed between species, although some differences were detected between cultivars within species. Susceptibility of seedling plants to herbicide injury was always equal to or greater than established plants. Additional traits being studied to facilitate more effective competition between forages and invasive annual grasses include growth rate, phenology, resource acquisition, and response to grazing and wildfire. This research suggests that identifying and maximizing traits that increase the competitiveness of forages with weedy annual grasses is important in forage breeding and development programs in the Intermountain West.
J.Earl Creech
Utah State University,Department of Plants,Soils and Climate4820 Old Main Hill,Logan,UT 84322-6300,USA
国际会议
陕西杨凌
英文
195-196
2010-10-09（万方平台首次上网日期，不代表论文的发表时间）