During the period from 2018 to 2021, we participated in the conduct of an experiment to study the effectiveness of hydrogen peroxide in treating and preventing the spread of grapevine diseases (BLVT). Hydrogen peroxide is an inorganic compound that occurs in plants as a wear molecule or affects other organic molecules that trigger the plant's immune system. The observation and treatment of the vines took place in a vineyard near Komen in the Karst. The vineyard included 279 vines of ʽRefoškʼ variety and the success of the treatment was checked in the following year. The inspection was carried out in such a way that we examined each vine and determined its state of health, which was recorded in the field book. The infected plants were bored to a depth of 5-6 cm in the stem area. 10% hydrogen peroxide was injected into the drilled hole, and the resulting hole was protected with grocery. Plants were treated only once during the growing season. After four years of observation and work, we noticed that we successfully cured 58,2 % of diseased vines with active ingredient. Suggesting the effectiveness of the preparation in preventing the spread of infection throughout the vineyard. This indicates that the active substance prevented the partially decline of the vines in the selected vineyard. Four treated vines failed in 2020, and 30 treated vines in 2021, then we replaced them with new ones. We did not perform a control experiment, where untreated infected vines and treated healthy vines were included. I attribute the cause of the collapse to strong infections with pathogens, the drought in 2021.
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