PHYTOTOXICITY OF PARAQUAT ON WHITE AND GREEN HIBISCUS, SORGHUM AND ALPINIA LEAVES*

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Abstract
Summary. Paraquat was applied to while, variegated and green leaves of Hibiscus rosa sinensis L. Visual observations and moisture loss determinations revealed that the rate of tissue kill by paraquat was reduced in while tissue. Evidence from paraquat absorption and concentration studies indicated that phytotoxic differences were not due to amount or rate of absorption or protoplasmic susceptibility, but to differences in chlorophyll Content of treated leaves. Desiccants such as dinoseb, not dependent upon chlorophyll for rapid action, were equally affective on white and green leaves. The same reduced activity of paraquat on white leaf tissue was demonstrated for other species.Phytotoxicité du paraquat appliqué sur les feuilles blanches ou vertes de l'hibiscus, du sorgho et de l'alpinia