Table 1: Clubroot disease incidence and severity in four sets.

TreatmentNumber of plants*Ridit score**95% CIDisease incidence (%)Disease index (%)
0123 4

Set 1014811 0.805 (a)0.716~0.89510080.2
Set 21931100.323 (b)0.234~0.41320.8 8.3
Set 3716640.598 (c)0.508~0.68770.848.9
Set 42220000.274 (b)0.184~0.363 8.3 2.1

Clubroot severity, where 0 (healthy) = no clubbing; 1 (slight) = very small galls, or diam. <4 mm; 2 (moderate) = galls <10 × 5 mm, or 7.5 mm diam. 3 (severe) = galls <20 × 10 mm, or 15 mm diam. 4 (very severe) = galls >20 × 10 mm, or 15 mm diam.
Ridit scores within columns followed by different letters are significantly different ( ).