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Incidence of citrus tristeza virus (CTV) disease in three fields.

Source: R/data.R
citrus_ctv.Rd

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,yGrid spatial coordinates.
[, 3]tYear of disease assessments.
[, 4]iDisease incidence. 0: Healthy, 1: Diseased.
[, 5]nSampling unit size. n = 1 means that the sampling unit size is the plant.

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

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.