. Research for tomorrow's forests : 1983 research accomplishments. --. Forests and forestry Research United States. New Model Predicts Field Effectiveness of Insecticides Many attempts based solely on labora- tory test results have been made to predict the effectiveness of chemical insecticides on forest defoliators. Laboratory tests are considerably less expensive than field trials and, if well designed, could be used to plan and predict the results of field trials and ensure that desired insect mortality is attained at minimum cost. Scientists at the Pacific Southwest Station and the Univers


. Research for tomorrow's forests : 1983 research accomplishments. --. Forests and forestry Research United States. New Model Predicts Field Effectiveness of Insecticides Many attempts based solely on labora- tory test results have been made to predict the effectiveness of chemical insecticides on forest defoliators. Laboratory tests are considerably less expensive than field trials and, if well designed, could be used to plan and predict the results of field trials and ensure that desired insect mortality is attained at minimum cost. Scientists at the Pacific Southwest Station and the University of Idaho, Moscow, have developed a probability model that predicts how efficient insecticides will be against western spruce budworm and Douglas-fir tus- sock moth populations during their seasonal development. The model is flexible and interactive. It can also be used to predict the effect of a chemical insecticide for any specified distribution of the immature larval stages. This model will be useful both as a research tool and as an aid for forest managers specifically concerned with managing western spruce budworm or Douglas-fir tussock moth. The model predicts the results of actual field applications with 73- to 95-percent accuracy. The logic that this model uses should be adaptable to other forest defoliators, once comprehensive labora- tory data bases have been developed for Adjust mortality according to time ot rainfall To choose an insecticide for or Douglas-fir tussock moth this model. 22 Adjust mortality according to time of rainfall. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Forest Service. [Washington, D. C. ?] : USDA, Forest Service


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