Development of an Effective Nonchemical Method against Plasmodiophora brassicae on Chinese Cabbage

Table 1

Clubroot disease incidence and severity in four sets.

Treatment	Number of plants*					Ridit score**	95% CI	Disease incidence (%)	Disease index (%)
	0	1	2	3	4
Set 1	0	1	4	8	11	0.805 (a)	0.716~0.895	100	80.2
Set 2	19	3	1	1	0	0.323 (b)	0.234~0.413	20.8	8.3
Set 3	7	1	6	6	4	0.598 (c)	0.508~0.687	70.8	48.9
Set 4	22	2	0	0	0	0.274 (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 (𝑃<0.05).