Abstract

An alfalfa growth simulation model, modified to incorporate the impact of the alfalfa stem nematode and include an economic analysis component, is reported. The modified model was calibrated for Colorado growing conditions and used to evaluate nematode control measures and determine the optimal time for alfalfa replacement when fields are infested with the alfalfa stem nematode. The results indicate that planting nematode-resistant varieties increases returns from nematode-infested alfalfa fields. Nematode control activities implemented at the proper time can extend the economic life of an alfalfa stand. Planting a non-host crop in the fifth year of production also increases returns.

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