Modeling Seasonal Abundance of Douglas-Fir Beetle in Relation to Entomophagous Insects and Location in Trees

摘要

Regression models were developed to predict abundance of Douglas-fir beetles in relation to entomophagous species, date, and sample characteristics. Probability of presence of entomophagous insects on samples was determined with the logistic function. Predation and parasitism were estimated to have caused 58 percent mortality of progeny during the summer.