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%.
Format
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. |
Source
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