lsrnail,, A., Radwan, E., Elhaak, M. (2004). EFFECTS OF SPRAYING WITH POTASSIUM AND FUNGICIDES ON THE CONTROL OF EARLY BLIGHT DISEASE AS WELL AS POTATO YIELD AND QUALITY. Journal of Plant Production, 29(3), 1433-1455. doi: 10.21608/jpp.2004.238590
A. A. lsrnail,; E. A. Radwan; M. A. Elhaak. "EFFECTS OF SPRAYING WITH POTASSIUM AND FUNGICIDES ON THE CONTROL OF EARLY BLIGHT DISEASE AS WELL AS POTATO YIELD AND QUALITY". Journal of Plant Production, 29, 3, 2004, 1433-1455. doi: 10.21608/jpp.2004.238590
lsrnail,, A., Radwan, E., Elhaak, M. (2004). 'EFFECTS OF SPRAYING WITH POTASSIUM AND FUNGICIDES ON THE CONTROL OF EARLY BLIGHT DISEASE AS WELL AS POTATO YIELD AND QUALITY', Journal of Plant Production, 29(3), pp. 1433-1455. doi: 10.21608/jpp.2004.238590
lsrnail,, A., Radwan, E., Elhaak, M. EFFECTS OF SPRAYING WITH POTASSIUM AND FUNGICIDES ON THE CONTROL OF EARLY BLIGHT DISEASE AS WELL AS POTATO YIELD AND QUALITY. Journal of Plant Production, 2004; 29(3): 1433-1455. doi: 10.21608/jpp.2004.238590
EFFECTS OF SPRAYING WITH POTASSIUM AND FUNGICIDES ON THE CONTROL OF EARLY BLIGHT DISEASE AS WELL AS POTATO YIELD AND QUALITY
2Horticultural Res. Ins., Agric. Res. Center, Giza
3Botany Dept. Fac. Sci. Tanta Uni. Tanta, Egypt
Abstract
The present study was carried out at Gemmeiza Agricultural Research Station at EI-Gharbiya Governorate. Egypt in two successive growing seasons of potato '(Solanum iuberosum, cv Diamant) as a host plant for Altemaria solani causing the early blight disease. The study included a laboratory and field experiments. In vitro results showed that Champion was the most potent as it had ICso of O.37ppm while Koruse had the least effect (ICsa value of 5.65ppm). Potassium had a negligible toxic effect in comparison with the used fungicides where its ICsa was 20.98ppm. The co-toxicity factor (CTF) indicated that K combinations with the used fungicides acquired synergistic or additive effects towards the fungus. The severity of early blight disease in potato plants under the field conditions decreased greatly by the doses than the half doses of the used fungicides. Combining K with the fungicides reduced the disease severity especially with the doses of fungicides. Application of K combined with the tested fungicides caused marked increase in potato tubers yield as compared with the control. This may be due to the reduction of early blight disease incidence as indicated from the disease severity. In addition. the enhancement for vegetative growth was reflected greatly on the tubers crop of the plant. Potassium increased the fungicides half doses actual effectiveness to be equal or higher than that of their doses. Commercially. K combination with the used fungicides could be used to decrease both controlling costs of the disease and environmental pollution. The study recommends a potassium foliar spray at the time of fungicides application for increasing their effectiveness on the disease control and on the host plant growth and yield.
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