Influence of Selected Protectant Fungicides and Host Resistance on Simple and Complex Potato Late Blight Forecasts

Publisher Website
Google Scholar
Abstract
Models of the initial deposition, weathering and efficacy of triphenyltin hydroxide and captafol were developed and used in simulation studies designed to construct simple and complex potato late blight [caused by Phytophthora infestans] forecasts. The complex forecast recommended fungicide applications according to weather conditions, cultivar resistance and fungicide type. In the simple forecast, sprays were recommended at fixed intervals according to cultivar resistance and fungicide type. In field experiments, spraying according to either method held final disease to levels of < 5%. Fewer sprays were recommended for the moderately resistant cultivars than for the more susceptible cultivars.