Thermotherapy as a method of healing grape plants from Botrytis cinerea

The purpose of research is to optimize the technology for the production of grape planting material free from Botrytis cinerea using thermotherapy and the Albit complex preparation. The objects of research are the grape variety Pamyati Smirnova, the rootstock Kober 5BB, the complex action drug Albit (0.2 %). The experiment was carried out in the developed experimental setup (patent No. 2626722) on the basis of the All-Russian Research Ya.I. Potapenko Institute for Viticulture and Winemaking, 2017-2019. Experiment scheme: 4 variants (90 vine plants each), 3-fold repetition. Research, observations, and accounting were carried out according to generally accepted methods. As a result of the experiments, it can be concluded that the use of temperature regimes (thermotherapy) and the simultaneous saturation of vaccinations with macro- and microelements (the drug of complex action Albit) can be successfully used to combat Botrytis cinerea. The combined use of 0.2 % of Albit and thermotherapy at 45-50 °C for a 10-minute exposure proved to be effective in obtaining healthy grape plants. Such an exposure of time and concentration of the complex preparation made it possible to free grape seedlings from Botrytis cinerea (output of affected seedlings - 0.2 %), while in the control variant (quinosol 0.1 %) seedlings with a visible lesion of 28 %. With thermotherapy at 45-50 °C for 10 minutes, the best result was obtained, the yield of seedlings was 80.6 %. In the control variant, a large number of seedlings were shocked by Botrytis cinerea and their yield was 27.4 %.