1. The effectiveness of the kaolin clay towards Monilia fructigena and Alternaria solani under laboratory conditions

Author: Donyo Ganchev


Kaolin appears as odorless white to yellowish or grayish powder. Contains mainly the clay mineral kaolinite (Al2O3(SiO2)2(H2O)2), a hydrous aluminosilicate. It is used in the manufacture of china and porcelain and is also widely used in the production of paper, rubber, paint, drying agents, and many other products. It has a role as an excipient and an antidiarrhoeal drug and as an absorbent and filler including in some pesticide formulations. In this study, kaolin was tested under in vitro conditions against Monilia frucidena and Alternaria solani. The conducted tests have shown that it can be а potentially preventive fungicide against these plant pathogens. The substance was able to achieve full blocking of the germination of conidiophores and а growth of mycelium of Monilia frictigena at 0.1 % (m/v) concentration and at 0.3-0.5 % (m/v) towards conidiophores and mycelium of Alternaria solani.

Keywords: kaolin clay, phytopathogens, antifungal activity