A Computer Model to Evaluate Chemical Control of Beet Armyworm in Chrysanthemum Ranges in Florida

George D. Butler Jr., S. L. Poe, G. L. Crane, C. Mellinger, Dreama Clark

Abstract


The population of beet armyworms, Spodoptera exigua (Hubner), in a chrysanthemum range near Ft. Myers, Florida, was simulated by a model based on the insect life history, the maximum and minimum temperatures, and light trap records. The increase in population with no treatments was similar to that observed at Red Rock, Arizona, and at Gainesville, Florida. Then the effect of insecticides on the life stages was superimposed in the model. With treatments, the populations could not be sustained at the original level. However, when migrant adults were added, the original populations were approximated. Thus, eggs from migrant moths place an unceasing demand upon the control program to insure plant protection and to maintain production.

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