stirret.borers {agridat} | R Documentation

## Corn borer control by application of fungal spores.

### Description

Corn borer control by application of fungal spores.

### Format

A data frame with 60 observations on the following 4 variables.

`block`

  block, 15 levels

`trt`

  treatment, 4 levels

`count1`

  count of borers on August 18

`count2`

  count of borers on October 19

### Details

Experiment conducted in 1935, Ottawa. European corn borer infestation was established by application of egg masses to plants. Treatments were applied on July 8 and July 19 at two levels, 0 and 40 grams per acre. The number of borers per plot were counted on Aug 18 and Oct 19.

### Source

Stirrett, George M and Beall, Geoffrey and Timonin, M. (1937). A field experiment on the control of the European corn borer, Pyrausta nubilalis Hubn, by Beauveria bassiana Vuill. Sci. Agric., 17, 587–591. Table 2.

### Examples

    data(stirret.borers)
    dat <- stirret.borers

    require(lattice)
    xyplot(count2~count1|trt,dat, main="stirret.borers - by treatment",
           xlab="Early count of borers", ylab="Late count")

    # Even though the data are counts, Normal distribution seems okay
    # qqmath(~count1|trt, dat, main="stirret.borers")

    m1 <- lm(count1 ~ trt + block, dat)
    anova(m1)

    if(require(effects)){
      e1 <- effect('trt',m1)
      as.data.frame(e1)
      plot(e1, main="stirret.borer")
    }

[Package agridat version 1.16 Index]