Weather-Based Fungicide Spray Programs for Control of Two Foliar Diseases on Carrot Cultivars Differing in Susceptibility

Plant Disease
P M Rogers, W R Stevenson

Abstract

Foliar diseases of carrot caused by Alternaria dauci and Cercospora carotae occur every year in Wisconsin, requiring repeated foliar fungicide applications to minimize defoliation and yield reduction. Improved timing of fungicide applications combined with the use of disease resistant cultivars offer growers a means to improve disease control with fewer fungicide inputs compared with the current strategy of weekly fungicide applications to a susceptible cultivar. Field experiments in 2002 to 2004 examined fungicide application schedules indicated by a disease forecasting model that calculated the duration of environmental conditions favorable for A. dauci and C. carotae (adaptation of TOM-CAST) on two carrot cultivars differing in susceptibility to these foliar diseases. All fungicide programs were initiated at a 1% disease severity threshold determined by scouting. Intervals for weather-based spray programs were based on in-canopy leaf wetness and temperature data. Fungicide sprays were applied according to 15 and 20 disease severity value (DSV) application thresholds, and were compared with a weekly spray program and an untreated control. Results of this trial demonstrated that fungicide sprays made according to weather data ...Continue Reading

References

Oct 1, 2002·Plant Disease·B M PryorR L Gilbertson
Apr 1, 2000·Plant Disease·Niklaus J GrünwaldWilliam E Fry

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Citations

Feb 14, 2009·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Valérie Le ClercMathilde Briard
Jul 29, 2021·Journal of Applied Microbiology·Kandeeparoopan PrasannathOlufemi A Akinsanmi

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