Cica2 {BSagri}

Catches of Planthoppers and Leafhoppers

Description

Data of a field trial concerning the impact of a genetically modified variety on the abundance of Planthoppers and Leafhoppers. The trial was designed as a randomized complete block design with 8 blocks (Row). In each block, three treatments were randomized: a conventional variety treated with insecticides (Insecticide), a genetically modified variety (GM), and the near-isogenic line (Iso) the to genetically modified line. These data originate from the second year of the trial in Cica1.

Usage

data(Cica2)

Format

A data frame with 24 observations on the following 8 variables.

Field

a factor with 2 levels, 1 2, separating the two major sites of the trial. On field 1, the blocks 1-5 were situated, on field 2, blocks 6-8 were situated.

Row

a factor with 8 levels, specifying the blocks: R1 R2 R3 R4 R5 R6 R7 R8

Year

a numeric vector, with value 2 for the second year

Treatment

a factor with 3 levels, specifying the genetically modified variety GM, the conventional variety treated with insecticides Insecticide, and the variety that was near-isogenic to the GM variety Iso

Au_Bonitur

counts of Auchenorryhncha by visual assessment

Zs_sweep_netting

counts of the major species Zyginidia scutellaris, catched by sweep nets

Zs_yellow_traps

counts of Zyginidia scutellaris, catched by yellow traps

Zs_stick_traps

counts of Zyginidia scutellaris, catched by sticky traps

Source

...

References

See Cica1 for data of the same trial a year earlier

Examples

data(Cica2)


# A comparison of the treatments:

layout(matrix(1:4,ncol=4))

ylim<-range(Cica2[,c("Au_Bonitur","Zs_sweep_netting", "Zs_yellow_traps", "Zs_stick_traps")])

boxplot(Au_Bonitur ~ Treatment, data=Cica2,
 main= "Aucherrhyncha, visual assessment", ylim=ylim, horizontal=TRUE, las=1)

boxplot(Zs_sweep_netting ~ Treatment, data=Cica2,
 main="Z.scutellaris, sweep netting", ylim=ylim, horizontal=TRUE, las=1)

boxplot(Zs_yellow_traps ~ Treatment, data=Cica2,
 main="Z.scutellaris, yellow traps", ylim=ylim, horizontal=TRUE, las=1)

boxplot(Zs_stick_traps ~ Treatment, data=Cica2,
 main="Z.scutellaris, sticky traps", ylim=ylim, horizontal=TRUE, las=1)

# A comparison of sampling methods:

pairs(Cica2[,c("Au_Bonitur","Zs_sweep_netting", "Zs_yellow_traps", "Zs_stick_traps")])