Assessments of bacterial blight of onion at two dates. The experimental plot was sown with naturally X. axonopodis pv. allii-contaminated onion (A. cepa L. cv. Chateau-vieux) seed lot, with a contamination rate of about 0.04%.
A data frame with 1134 rows and 5 variables:
|[, 1:2]||x,y||Grid spatial coordinates.|
|[, 3]||t||Date of disease assessments.|
|[, 4]||i||Disease incidence. 0: Healthy, 1: Diseased.|
|[, 5]||n||Sampling unit size. n = 1 means that the sampling unit size is the plant.|
Roumagnac P, Pruvost O, Chiroleu F, Hughes G. 2004. Spatial and temporal analyses of bacterial blight of onion caused by Xanthomonas axonopodis pv. allii. Phytopathology 94, 138–146. doi:10.1094/PHYTO.2004.94.2.138