Influence of Weather on Low Larkspur (Delphinium nuttallianum) Density

Jim Pfister and Cook D.

Journal of Agricultural Science, 2011, vol. 3, issue 1, 36

Abstract: Delphinium nuttallianum (low larkspur) causes serious cattle losses on mountain rangelands in western NorthAmerica. Risk of cattle deaths is related to density of low larkspurs. Our hypothesis was that warmer winter/springconditions, coupled with below average precipitation, would result in reduced low larkspur density (plants/m2).We measured larkspur density using 4 transects at 4 sites- Collbran and Yampa, Colorado; Huntington, Utah; andCalf Creek (Teton Mountains), Wyoming over a 7-9 year period. Weather data was collected at nearby weatherstations. Larkspur density was often related to previous winter and spring precipitation, with increasedprecipitation resulting in higher plant densities. Higher ambient temperatures during winter and spring wererelated to lower plant densities. Further, there was a relationship between weather during the previous growingseason (May to July) and larkspur density the next year, with warmer temperatures and/or low precipitation relatedto reduce densities at 3 of 4 sites.

Date: 2011
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