Quantifying the Rate of Release and Escape of Phytophthora infestans Sporangia from a Potato Canopy

• DOI: 10.1094/phyto.2001.91.12.1189
• Publication Date: 2007-05-11T11:12:47Z
• Authors: Donald E. Aylor; William E. Fry; Hilary Mayton; Jorge L. Andrade-...
• Keywords: Phytophthora infestans; Zoospore

A means for determining the rate of release, Q (spores per square meter second), spores from a source inoculum is paramount quantifying their further dispersal and potential spread disease. Values were obtained Phytophthora infestans sporangia released an area diseased plants in potato canopy by comparing concentrations airborne measured at several heights above source, with predicted Lagrangian Stochastic simulation model. An independent estimate was number unit beginning each sampling day harvesting plant tissue enumerating these samples. This standing spore crop during day. The apportioned into time segments corresponding to concentration measurement periods using trace sampled Burkard continuous suction sampler. apportionment yielded release rates that compared modeled rates. two estimates highly correlated (P = 0.003), indicating model has utility predicting P. disease between fields.