Table 5.

Local lesion number (LLN) on leaves of treated Datura stramonium plants inoculated with tobacco mosaic virus and on leaves of control plants (C) on days three and seven post-inoculation (dpi). Prior to inoculation, D. stramonium plants were treated with essential oil (EO) or hydrosol (H) of Dittrichia viscosa for two consecutive days.

dpi		LLN ± SD
3rd	C	6.2 ± 0.2 a
	EO	4.6 ± 0.2 b
	H	0.7 ± 0.2 c
7th	C	14.2 ± 2.4 a
	EO	8.9 ± 2.0 b
	H	1.2 ± 0.4 c

SD, the standard deviation of triplicate analysis; significant differences were determined by one-way ANOVA. ^{a, b, c} Mean values with different superscripts indicate statistically significant differences between control and essential oil/hydrosol treatment data (p ˂ 0.05).