PRIMARY PLACE OF ACTION AND SYMPTOMS INDUCED IN PLANTS BY 3-(4-CHLOROPHENYL)-1, 1-DIMETHYLUREA

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Abstract
Application of monuron to kidney-bean, tomato, spinach, corn, and barley produced the following symptoms: acute water-soak blotch, silver blotch, indeterminate grey blotch, wilt, petiole collapse, stem collapse, rapid yellowing, abscission, and partial chlorosis. These symptoms and the conditions under which they developed are described. In the gross response of plants to monuron treatment two or more symptoms usually were involved and the syndrome was influenced by plant species, dose, and environmental conditions. The primary place of monuron action was in the shoots of plants.In excised leaves internal concentrations of 100 to 400 micrograms of monuron per gram fresh weight produced extensive acute water-soak blotching within a matter of hours. Internal concentrations of 25 to 50 micrograms per gram fresh weight produced, after several days, such symptoms as wilt, silver blotch, indeterminate grey blotch, rapid yellowing, and abscission in addition to the few isolated acute water-soak blotches which developed soon after treatment.

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