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Abstract
In this paper a simulation model is constructed whereby it is possible to evaluate economic consequences of various applications of pesticides at farm level. The estimations are based on dose response functions for pesticide use for different crops with respect to fungus, insects and weeds. The loss of each type of pesticide is added to get a total estimate of the loss at field level. Finally gross margin at crop level and farm level are estimated with respect to loss and the optimal treatment frequency index.