The influence of various pesticide loads on the development of late blight and potato alternariоsis in the Central region of Russia

Abstract

Field experiments were conducted to test three schemes for the use of drugs of different action spectra in order to reduce the chemical load on the potato biocenosis. The experiments were carried out on four varieties differing in resistance to late blight. According to the results of two-year tests, it was revealed that on resistant varieties Grand, Kumach and medium-resistant varieties Gulliver, even in epiphytotic years for late blight, it is possible to use alternating preparations, which reduces the chemical load by 33.3%. On the Northern Lights variety unstable to late blight, only a chemical scheme can be used in such years. In the years with the depressive development of late blight, the use of any schemes was not very effective. Etching of planting tubers with Edikum preparation in some years reduces the germination of Grand and Gulliver varieties by 90-70%, Kumach and Northern Lights varieties by 13-16%, which negatively affects potato yields.