Dynamics of alternaria brassicicola affection on mustard during vegetation in conditions of Northern Precaucasus

The dynamics of A. brassicicola affection on mustard during vegetation in conditions of Northern Precaucasus is shown. It is revealed that the environment during vegetative period of plants and plant maturing phase are the main factors influencing on the dynamics of disease development and expansion. The best period for A. brassicicola inoculation is the phase of yellow-green pod coinciding with the mass spore flying. The disease is developing intensively at hydrothermal coefficient > 0.8, air temperature 20-24 °C, and relative air humidity more than 60 %.