Table 4.
Summary of ANCOVA results for latent period
| Source | DF | Type II SS | F | p |
|---|---|---|---|---|
| Block |
1 |
8.238 |
26.612 |
<0.0001 |
| Pathogen |
4 |
3.595 |
2.903 |
0.0323 |
| Whole-plot error |
44 |
13.621 |
4.495 |
0.0002 |
| Pustule density |
1 |
2.301 |
33.407 |
<0.0001 |
| Host |
4 |
5.783 |
20.993 |
<0.0001 |
| Host x Pustule density |
4 |
0.757 |
2.746 |
0.0556 |
| Pathogen x Host |
16 |
1.292 |
1.173 |
0.3604 |
| Split-plot error | 21 | 1.446 |
The response variable is latent period, and it was measured as days until 50% of the pustules were producing spores. Log transformed pustule density (pustules per cm2 of leaf tissue) was used as a covariate. The interaction effect of pathogen genotype by pustule density was not significant and was removed from the model.