Keywords
Abstract
With the annual distribution and development of previously insignificant diseases, timely monitoring and improving
of protection measures on grape plantings of Crimea remains relevant. The goal of the research was to specify the pathogen and
its diagnostic features; studying the peculiarities of development and injuriousness of Alternaria blight in the vineyards of Crimea;
determining the optimal timelines of fungicide treatments for effective control of its development on grape plants. The studies
were carried out in 2018–2020 on grape plantings of enterprises situated in the South-West viticultural zone of Crimea, as well
as in the Plant Protection Laboratory of the Institute Magarach according to the methods and techniques generally accepted in
national and international practices. The obtained results show an increase in the intensity of development and injuriousness of
Alternariosis on fragile grape plants under unfavorable meteorological conditions (increased solar radiation, high air temperature,
low relative humidity and soil drought). In the conditions of Crimea, the most sensitive to Alternaria blight grape varieties are:
‘Aligote’, ‘Chardonnay’, ‘Rkatsiteli’, ‘Cabernet-Sauvignon’, ‘Saperavi’ and ‘Bastardo Magarachskiy’. In a series of field experiments,
the timelines of using fungicides in protection against disease were determined. High biological efficiency (74.7–84.3%) and a
longer period of control over the disease progress with preventive use of fungicides, starting from the phenological phase “end
of flowering”, have been shown. The obtained research results will be used in the development of regulations for phytosanitary
monitoring and control of grape Alternariosis.