ISHS Acta Horticulturae 525: International Conference on Integrated Fruit Production
BIOLOGICAL ACTIVITY OF GLYPHOSATE AND ITS POTENTIAL USE IN ORCHARDS |
| Authors: | S. Stefan, E. Bucur |
| Keywords: | glyphosate, simazine, apple-trees, peach-trees, weeds |
| Abstract:
The purpose of this paper was to assess the biological activity of glyphosate-based products. To increase the activity spectrum, an additional experiment was carried out, where glyphosate application was preceded by a pre-emergence simazine treatment. Studies were conducted on apple and peach-trees, in the experimental field of the RIPP-Bucharest, on a forest brown-reddish soil, with a neutral pH. The trial was set up as a randomised block design with 4 replications and individual plots of 100 m2. Weed density (plants m-2) and weight (g m-2) were determined 45 and 60 days after treatment (DAT), respectively. With the simazine application, assessments were made 15 DAT as well. Simazine application resulted in a low efficacy 15 DAT. Glyphosate-based herbicides showed a relatively good efficacy. The species Cirsium arvense (L.) Scop., Convolvulus arvensis L., Cynodon dactylon (L.) Pers., Polygonum aviculare L., Polygonum convolvulus L., Sonchus arvensis L. are moderately resistant, so the control level did not exceed 60 %. To achieve a high efficacy, we recommend application of 2 treatments of glyphosate: the first one in May and the second one in July, when a new weed infestation occurs. | |
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