Use of tank mixtures for potato plants protection from Phytophthora infestans and Alternaria solani disease agents

Abstract

Comprehensive crop protection systems, including disease potatoes, were developed and applied during the 1960s and 1980s. The basic principle underlying them is the need to combine all known methods of protecting plants from different groups of phytopathogens (insects, pathogens, weeds) into a single system of measures. During this period, the chemical method of plant protection against pathogens was intensively developing and in complex systems, it was supposed to combine it with others, mainly agrotechnical and biological. Complex systems were built based on the zonal approach, that is, taking into account the species composition of pathogens and other pathogens affecting potatoes in a given agroclimatic zone.One of the major problems of stable high potato yield is a timely implementation of preventive measures against diseases and pests. Insignificant size of land and low quality planting material, failure to observe rotation of crops leads to accumulation and spread of such disease agents as Phytophthora infestans (Mont.) de Bary and Alternaria solani that can significantly decrease yield by 60% and more unless protection means are applied. It was determined that tank mixture of chemical, biological preparations and growth regulators with chemical Antrakol and growth regulator Humisol was most effective against plants damaged by phytophthora. It was ascertained that combination of chemical Antrakol and growth regulator Humisol was most effective for treatment against Phytophthora infestans and Alternaria solani when damage of different by resistance varieties of potato at blooming stage (maximum development of pathogenic agents) by Phytophthora infestans was 1.4–24.6% and by Alternaria solani 6.8–22.2%.