Economics of Tall Larkspur Control

Abstract

Tall larkspur (Delphinium barbeyi Huth.) was chemically controlled in the subalpine areas of the Manti Canyon Cattle Grazing Allotment in Central Utah, and the reduction in cattle losses on controlled areas was observed. Without control, an average of 36 mature cattle were lost per year over a 15-year period, and an average of 11 calves were lost per year over an 8-year period. Cost of control ranged from $15-$22 per acre of larkspur for the first application, and from $13-$17 per acre for the second application. Cattle losses were reduced over 90% in the sprayed pastures. Thus, the estimated annual value for adult cattle saved was $8,250 and for saved calves it was $1,200. Internal rates of return ranged from 72.25% to 60%, with the rate dependent upon whether calves saved were included. A return of 10% can be expected from larkspur control if eight to nine cows are saved each year for 10 years.