Influence of Spraying Two Borate Compounds on Controlling Cercospora Leaf Spot Disease and Productivity of Sugar Beet

Document Type : Original Article

Author

Agric. Botany Dept., Plant Pathol. Branch, Fac. Agric., Al-Azhar Univ. (Assiut Branch), Egypt

Abstract

Fifteen isolates of Cercospora beticola Sacc. were isolated from naturally diseased sugar beet plants collected from different localities at El-Behera Governorate, Egypt. All isolates were able to infect Pleno sugar beet cultivar and they significantly differed in their virulence. In vitro study, inhibitory effect of borates was tested on mycelial growth of C. beticola at different concentrations, i.e. 10, 20, 40, 60, 80 and 100 ppm. Borates were able to inhibit the mycelial growth of the pathogen, when they were added to the medium at all the tested concentrations. The results showed that borax strongly inhibited C. beticola mycelial growth and had more fungistatic and fungicidal activities than those of boric acid and the fungicide Cabrio Top 60%. Under field conditions, spraying of diseased plants with borates at concentrations of 0.50 and 1.00 g/l water was effective in decreasing disease severity. The highest reduction in disease severity was observed in case of borax treatment at concentration of 1.00 g/l water. Treatments with borates improved agronomic characters of roots, i.e. root yield, total soluble solids (T.S.S), and sugar percent. Moreover, they decreased potassium, sodium and alpha amino acids and increased the quality of sugar beet yield.

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