Abstract
Summary Making a survey we recognize, that the phenylurea herbicides fenuron, monuron, and metobromuron are easily resorbed by the plants, and are carried there by the xylem flux. The quantities of these substances, which are able to act as herbicide are functions of the type of soil, of their solubilities in water and of weather conditions. The phenylureas are metabolized in microorganism, plants, and animals by N-demethylation and N-demethoxylation. In part, during these procedures phenylhydroxylation takes place, and in very few cases hydrolysation to aniline is found. 3 years after its application monuron cannot be detected at all. But in some ripe fruits of several plants traces of these herbicides may be found after application in the actual period of growing.
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