Ma. Catangui et al., CALCULATING ECONOMIC INJURY LEVELS FOR STABLE FLIES (DIPTERA, MUSCIDAE) ON FEEDER HEIFERS, Journal of economic entomology, 90(1), 1997, pp. 6-10
A procedure for calculating the economic injury levels for stable flie
s, Stomoxys calcitrans (L.), on feeder heifers was developed from redu
ction of average daily weight gain-stable fly population level data in
8 independent replicated experiments over 17 yr. A negative exponenti
al was fitted to the data using nonlinear regression. Regression coeff
icients were then used to derive a simple predictive equation for calc
ulating the economic injury level in relation to cost of controlling s
table flies in the feedlot, and the market value of heifers. Examples
for calculating the economic injury level under practical feedlot situ
ations are presented. Also included are recommendations for a simple r
andom sampling design for flies feedlots.