Six salts, i.e. calcium chloride, calcium sulphate, calcium carbonate, sodium bicarbonate, potassium chloride and potassium sulphate and three commercial disinfectants; Bafry, Sanosil Super 25 and Max Guard and five acids, ascorbic acid, citric acid, salicylic acid, boric acid and palmitic acid were evaluated on the inhibition of mycelial growth and sclerotial formation of Botrytis cinerea and Sclerotinia sclerotiorum in vitro. All designated materials were also evaluated for their effects in controlling grey mold and white rot diseases on bean pods in vivo. Salicylic acid, Max Guard and sodium bicarbonate were the best effective compounds on reducing the growth of Botrytis. cinerea and Sclerotinia. sclerotiorum and they were the best effective on the sclerotial formation of B. cinerea and S. sclerotiorum where these caused complete reduction of sclerotia with all concentrations. Under storage conditions, boric and palmitic acids as well as Max Gurad, Sodium bicarbonate and Bafry salts were highly effective on disease reduction when used with 0.3% conc. on bean pods that infected with B. cinerea and S. sclerotiorum also under the natural infection. Max Guard with 0.3% conc. kept the green color of pods and gave highest amounts of chlorophyll A and chlorophyll B. While, salicylic and palmitic acids were more effective in protecting the content of chlorophyll A when used with 0.2 % conc. Spraying bean plant with calcium sulphate and potassium salphate (as pre harvest treatment) were more effective in decreasing the pod rots caused by B. cinerea and S. sclerotiorum under storage. Meanwhile, salicylic acid was also more effective in this respect. Potassium sulphate was the only effective compound where it increased the chlorophyll A, B and A+B when used with 0.3% conc. compared with the other salts and acids.
Key words: bean, B. cinerea, S. sclerotiorum., storage, salts, acids, chlorophyll. |
