Economic and biological efficiency of plant protection schemes of perspective Russian selection potato cultivars

In 2022–2023, field experiments were conducted to test three fungicide application schemes that differed by saturation degree of chemical preparations and Kartofin in order to reduce the chemical load on the potato biocenosi. The experiments were carried out on four varieties differing in resistance to Late and Early Blight. Based on the results of testing all varieties, regardless of their resistance degree and grade of years epiphytotics, it was revealed that during the growing season it is possible to reduce the chemical load by 50% without reducing biological and economic efficiency through the use of highly effective chemical fungicides and their alternation with biological preparations that have, although less significant, a fungistatic effect.