In vitro fungicidal activity of plant oil based soaps towards apple scab (Venturia inaequalis)

Donyo Hristov Ganchev

Abstract


The plant oils and soaps are known from many years as promising eco friendly  insecticides used for control of the various soft-body insects. In present study in vitro trials with three soap formulations on the base of sunflower oil were conducted in order to be evaluated their potential to be developed as naturally  friendly fungicides for controlling of apple scab. This formulations, in the future can be viable alternative of present days commercial fungicides used for the management of apple scab as cheap, low toxic and easy to be manufacture plant protection products.  All formulations were tested at  1.0 % (v/v) concentrations by the method of leaf disks and germ tube inhibition method. The results show that tested soap on the base of sunflower oil  amended with potassium chloride was able to achieve 100 % inhibition of the mycelium and germ tube germination of the apple scab pathogen (Venturia inaequalis) at 1.0 % (v/v) concentration. Other soap formulations do not show any effectiveness to the tested phytopathogen. No phytotoxic manifestations onto treated apple leaves were observed during the leaf disks test. The conducted trials reveal that although the created soap formulation are very similar (all are on the base of sunflower soap neutralized with boric acid) the addition (mixing) of different substances like potassium chloride can completely change their action and effectiveness. This make soaps promising and good alternative to the expensive fungicides especially in the area of organic agriculture. 


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References


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MAYFEB Journal of Agricultural Science
Toronto, Ontario, Canada
MAYFEB TECHNOLOGY DEVELOPMENT
ISSN 2371-512X