| Sl. No. | Plants species | Family name | Compound isolated | Phytotoxicity on test plants | Authors |
| 1 | Citrus junos | Rutaceae | Abscisic acid-β-d-glucopyranosyl ester | The concentrations required for 50% inhibition (IC50) of the shoot and root growth of lettuce was 2.3 and 1.4 μM, respectively. | Kato-Noguchi et al. [106] |
| 2 | Hibiscus sabdariffa | Malvaceae | Trimethyl allo-hydroxycitrate | IC50 value for the shoot and root growth of garden cress was 20.3 and 14.4 mM, respectively. | Suwitchayanon et al. [107] |
| 3 | Ailanthus altissima | Simaroubaceae | Ailanthone | IC50 value for the radicle elongation of garden cress was 0.7 mL L−1 | Heisey [108] |
| 4 | Leucas aspera | Lamiaceae | 3:2 mixture of two labdane type diterpenes [(rel 5S,6R,8R,9R,10S,13S,15S,16R)-6-acetoxy-9,13;15,16-diepoxy-15-hydroxy-16-methoxylabdane and (rel 5S,6R,8R,9R,10S,13S,15R,16R)-6-acetoxy-9,13;15,16-diepoxy-15-hydroxy-16-methoxylabdane] | IC50 value for the seedling growth of garden cress and barnyard grass ranges from 31 to 80µM. | Islam et al. [109] |
| 5 | Hyptis suaveolens | Lamiaceae | 14α-hydroxy-13β-abiet-8-en-18-oic acid (suaveolic acid) | IC50 value for the growth inhibition of suaveolic acid for garden cress, Italian ryegrass, and barnyard grass were ranged from 76 to 1155 µM. | Islam et al. [110] |
| 6 | Mangifera indica | Anacardiaceae | Methyl-3,4,5-trihydroxybenzoate (methyl gallate) | IC50 value for the growth inhibition of garden cress roots and shoots were 3.9 and 3.3 mM, and those of foxtail fescue roots and shoots were 1.5 and 9.5 mM, respectively. | Suzuki et al. [111] |
| 7 | Castanea crenata | Fagaceae | 2α,3β,7β,23-tetrahydroxyurs- 12-ene-28-oic acid | IC50 value for the shoot and root growth of barnyard grass was 2.62 and 0.41 mM, respectively | Tuyen et al. [112] |
| 8 | Peganum harmala | Nitrariaceae | Harmaline | Inhibiting root elongation of lettuce and amaranth by 31% and 47% at a 5 µg mL−1 concentration | Shao et al. [113] |
| 9 | Azadirachta indica | Meliaceae | Nimbolide B and Nimbic acid B. | In case of Nimbolide B the IC50 value for growth inhibition of cress roots and shoots was 1.2 and 1.4 μM and that of barnyard grass roots and shoots were 3.7 and 39 μM, respectively.
In case of Nimbic acid B the IC50 value for the cress roots and shoots were 5.7 and 9.4 μM, respectively, and I50 of the barnyard grass roots and shoots were 29 and 210 μM, respectively. | Kato-Noguchi et al. [114] |
| 10 | Zanthoxylum limonella | Rutaceae | Xanthoxyline | At a concentration of 2500 μM, xanthoxyline completely inhibited seed germination and growth of Chinese amaranth, while seed germination, shoot and root length of barnyard grass were inhibited by 44, 72 and 88%, respectively by this compound. | Charoenying et al. [115] |
| 11 | Aglaia odorata | Meliaceae | Odorine, Rocaglaol | Odorine at concentration of 8000 ppm showed 79% reduction of barnyard grass germination, and exhibited seedling growth inhibition at all tested concentrations (1000, 2000, 4000 and 8000 ppm).
The IC50 value of Rocaglaol for garden cress and barnyard grass ranged from 0.09 to 2.5 µM. | Kato-Noguchi et al. [103] , Teerarak et al. [116] |