ISHS Acta Horticulturae 487: VI International Symposium on Processing Tomato & Workshop on Irrigation & Fertigation of Processing Tomato
SODIUM BICARBONATE FOR THE CONTROL OF ERYSIPHE POLYGONI IN GREENHOUSE TOMATO |
| Authors: | V.A. Bourbos, M.T. Skoudridakis, E. Barbopoulou |
| Abstract:
During the last years, an infection by the fungi Erysiphe polygoni D.C. has been observed in the open-field and greenhouse tomato cultivations. Sodium bicarbonate was tested individually or combination with the wetting agent Agral 90 for the control of the pathogen. Sodium bicarbonate and the wetting agent were used at the doses of 200 g and 25 ml/hl respectively. The fungicide pyrifenox was used as reference product at the dose of 20 ml/hl of the commercial product Dorado 20 EC. The experiments lasted two consecutive cultivation periods into a greenhouse where the Early pack No 7 cultivar was cultivated. Each experimental unit included 20 plants. Totally 4 sprayings were performed every 12 days with a low pressure sprayer. The efficiency of sodium bicarbonate, in the experimental units where it was individually used, was ranged from 79.6 to 80.6%. The infection was controlled at 88.7% in the experimental units where sprayings of the combination of sodium bicarbonate with the wetting agent were performed while there was no statistically significant difference compared to the reference product (88.6%). On the contrary, an increase of the infection spots per plant was observed in the plants that received sprayings with pure water or wetting agent from 9.93 to 89.84 and from 10.02 to 75.49 respectively. | |
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