Table 2.

Analysis of variance components including the degrees of freedom (df), sum of squares (SS), F ratio, and P value for fungal populations of Diaporthe batatas SP-d1 in surface layers of sweetpotato roots treated with gaseous chlorine dioxide (ClO₂)

Source of variation	Fungal population (log cfu/g dry wt.)a
	Experiment 1				Experiment 2
	df	SS	F	P	df	SS	F	P
Concentration	1	0.6	17.8	0.0012	1	0.1	0.4	0.5614
Time	2	1.8	29.2	< 0.0001	2	9.6	30.3	< 0.0001
Concentration × time	2	0.0	0.0	0.9971	2	0.7	2.2	0.1584

^aSweetpotato roots were dipped in spore suspension of isolate SP-d1 (5 × 10⁶ spores/ml) for 10 min and then treated with various ClO₂ concentrations (20 and 40 ppm) for 0, 30, and 60 min. After ClO₂ gas treatment, colony-forming units (cfus) on the surface layers of the roots were determined. Repeated experiments are indicated as experiments 1 and 2.