Table 5.

Plant biomass, visual rating of Olpidium disease severity, lettucenin A and benzoic acid concentrations in root exudates, root and leaf tissues of lettuce (cv. Tizian) grown in minirhizotrons in soils collected from fields with long-term biodynamic (BIODYN2) vs. mineral (CONMIN) fertilization history. Means of five replicates per treatment. Different lowercase letters indicate significant differences between biodynamic vs. mineral fertilization by one-way ANOVA, Tukey’s HSD pairwise test, (p ≤ 0.05). Disease severity’ assessed by +++ high and + low expression of disease symptoms on roots.

Treatments	Olpidium- Disease Severity	Plant Biomass	Root Exudates		Root Tissue		Leaf Tissue
	(Visual Rating)	[g Plant−1]	Lettucenin A [ng cm−1 Root]	Benzoic Acid [ng cm−1 Root]	Lettucenin A [µg g−1 FW]	Benzoic Acid [µg g−1 FW]	Lettucenin A [µg g−1 FW]	Benzoic Acid [µg g−1 FW]
BIODYN2 CONMIN	+++	1.41 b	0.34 a	4.06 b	1.77 a	0.11 a	0.49 a	0.0 a
	+	2.64 a	0.25 a	1.34 a	1.33 a	0.0 b	0.30 a	0.0 a