AbstractPlots of lettuce were grown in the field in soil treated with the herbicides propyzamide and chlorpropham, either separately, or as a mixture, or with one of the fungicides iprodione, vinclozolin or benomyl. Four harvests were made and at each, the mean fresh weight per lettuce treated with the mixture propyzamide plus chlorpropham, or with iprodione, was greater than that of the control. Propyzamide, chlorpropham or benomyl reduced lettuce fresh weight compared with the untreated controls, but vinclozolin had no effect. The concentration of total carotene in the lettuce was increased by treatment with propyzamide, chlorpropham, propyzamide plus chlorpropham, or iprodione. Treatment with vinclozolin or benomyl had no effect.
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