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Percentage of inhibition (IP) of lesions on leaves of treated Datura stramonium plants inoculated with tobacco mosaic virus compared to control plants on days three and seven postinoculation (dpi). Prior to inoculation, D. stramonium plants were treated with essential oil (EO) or hydrosol (H) of Dittrichia viscosa for two consecutive days. Error bars show the standard deviation of triplicate analyses; significant differences were marked with *.
