PHENOLOGICAL CYCLES OF THE TECHNICAL MONARCH VARIETY UNDER UNSTABLE WEATHER CONDITIONS OF THE SOUTH OF RUSSIA
Studies of the introduced German technical Monarch grape variety were carried out in the Black Sea agro-ecological zone of viticulture in the Krasnodar Territory. In unstable weather conditions, the duration of the growing season from blooming buds to the full physiological maturity of grape berries was 135 days in 2018, and in 2019 was 125 days. The variety showed the signs of an adaptive response to changing weather conditions. With an acute deficit of precipitation and a slow increase in air temperature in 2018, the duration of the second phase of the vegetation from the beginning of bud blooming to the beginning of flowering was 11 days longer. The significant difference in the duration of the second and third phases of vegetation is explained by the adaptive reaction of the introduced variety to lower air temperature in late May and early June in 2018. The difference in average daily air temperature during the period of active shoot growth and at the beginning of flowering reached 4.6 ºC, the amount of precipitation was 4.3 times less, that promoted the accelerated ripening of grapes in 2018. The maximum air temperature on average during the ripening period of grape berries was equal to 33 º С in 2018, and 31 ºС in 2019. The amount of precipitation was 3.3 times less than normal. The high adaptive reaction of the technical Monarch grape variety is of great practical importance for use in scientific purposes and in industrial production when creating the stable ampelocenoses in unstable weather conditions of Southern Russia.