Studies of fungal isolates from sugar beet rhizosphere

In laboratory and greenhouse conditions in Episkop Konstantin Preslavski University of Shumen, during the period 2013-2014 studies were performed of fungal isolates from rhizosphere of “slaughtered” plants of sugar beet. The ability of a variety of sustaining media for the cultivation of the isolates and the influence of factors soil herbicide (Dual) and humidity of the environment for the growth and aggressiveness of the different isolates was studied. It was found that Alternaria ssp. Grows well on organic environment; corn agar can be referred to as a selective medium for Pythium ssp.; more aggressive cause of slaughtering is Pythium ssp., and weaker - Afternaria ssp.; their aggressiveness is maximized in the presence of the entire complex tested isolates; at 70% and 90% от soil humidity the herbicide dal in a dosage of 4500 ml/ha suppresses the aggressiveness of Pythium ssp. and stimulates that of Aiternaria ssp.