Abstract
Field and laboratory studies were conducted in Córdoba, Spain, on olive (Oleae europeae L.) trees to determine the absorption and translocation of 14C-glyphosate applied to suckers at different growth stages and different times of the growing season. Absorption of 14C-glyphosate by olive sucker leaves was very low, ≈3% to 5% of the total 14C recovered. Absorption and accumulation of 14C-glyphosate decreased if suckers were more developed when herbicides were applied. This explains the greater susceptibility to herbicides of smaller olive shoots compared to larger ones. Translocation of 14C-glyphosate in the early season application (May) was predominantly acropetal, whereas it was basipetal in the last application (September). Therefore, herbicide applied early in the season has a lower risk of translocating to other parts of the tree. The concentration of 14C-glyphosate in different parts of the olive tree varied with time. From 10 to 30 days after herbicide treatment, its concentration decreased by 41% in the woody basal parts and by 33% in the fruit. In the same period, it accumulated in the leaves, increasing in concentration by 30%.
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