| citrus_ctv {epiphy} | R Documentation |
Incidence of citrus tristeza virus (CTV) disease in three fields.
Description
CTV incidence data for three orchards in eastern Spain reported for consecutive years.
Usage
citrus_ctv
Format
There are three data frames:
-
IVI3and4: A data frame with 864 rows and 5 variables. -
IVI6and7: A data frame with 648 rows and 5 variables. -
El_Realengo: A data frame with 2000 rows and 5 variables.
The structure is the same for all the data frames:
| [, 1:2] | x,y | Grid spatial coordinates. |
| [, 3] | t | Year 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. |
Details
Both IVI3and4 and IVI6and7 orchards consisted of 216 trees each
of Washington navel orange on Troyer citrange planted in 1978 on a 2 x 6-m
spacing. El_Realengo orchard consisted of 400 Marsh seedless
grapefruit on Troyer citrange planted in 1973 on a 5.5 x 5.5-m spacing.
Source
Gottwald TR, Cambra M, Moreno P, Camarasa E, Piquer J. 1996. Spatial and temporal analyses of citrus tristeza virus in eastern Spain. Phytopathology 86, 45–55.
Gibson GJ. 1997. Investigating mechanisms of spatiotemporal epidemic spread using stochastic models. Phytopathology 87, 139-46. doi:10.1094/PHYTO.1997.87.2.139