Table 3.
Number of local lesions (LLN) on leaves of treated host plants inoculated with tobacco mosaic virus and on leaves of control plants (C) on days 3, 5, and 7 postinoculation (dpi). Prior to inoculation, treated plants were sprayed with essential oil (EO) or hydrosol (H) of H. perforatum ssp. veronense for two consecutive days. SD, standard deviation of triplicate analysis; significant differences were determined by t-test. a, b Mean values with different superscripts indicate statistically significant difference between control and essential oil/hydrosol treatment data (p < 0.05).
| dpi | LLN ± SD | LLN ± SD | ||
|---|---|---|---|---|
| 3rd | C | 6.05 ± 2.19 a | C | 9.65 ± 3.77 a |
| EO | 0.72 ± 0.33 b | H | 4.93 ± 2.29 b | |
| 5th | C | 16.64 ± 3.25 a | C | 19.00 ± 3.24 a |
| EO | 6.24 ± 0.64 b | H | 12.05 ± 1.60 b | |
| 7th | C | 19.38 ± 6.05 a | C | 28.55 ± 3.82 a |
| EO | 9.50 ± 2.32 b | H | 17.34 ± 4.50 b | |