epiphy (version 0.3.4)

citrus_ctv: 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

Arguments

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.