aphids: Counts of aphids.

In epiphy: Analysis of Plant Disease Epidemics

Counts of aphids.

Description

Counts of 554 aphids of the species Sitobion avenae, sampled on 28 June 1996 in a 250 x 180-m field of winter wheat near Wimborne, Dorset, UK. The 63 sampling units, made of the inspection of five tillers each, were located on a 9 x 7 rectangular grid at intervals of 30 m.

Usage

aphids

Format

A data frame with 63 rows and 3 variables:

[, 1:2]	x,y	Grid spatial coordinates.
[, 3:4]	xm,ym	Metric spatial coordonates.
[, 5]	i	Counts of aphids.

Source

Perry JN, Winder L, Holland JM, Alston RD. 1999. Red-blue plots for detecting clusters in count data. Ecology Letters 2, 106-13. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1046/j.1461-0248.1999.22057.x")}

epiphy documentation built on Nov. 16, 2023, 5:06 p.m.