Influence of prelanding thermal and chemical processing (ingibitor mono-iodine-acetate, a preparation of «Maxim», a preparation of "Sinram") on tubers and plants of a potato in vegetation is studied. It is shown that influence of temperature and chemical processing on ability to life tubers was observed only at long experiment in some months. Heat treatment slowed down the sproating and development of sprouts on tubers of steady and susceptible grades. The appeared sprouts differed depending on a potato grade and processing regime. Prelanding heat treatment of tubers of a potato of a susceptible grade before infection constrained display of external signs of an infection at plants. On plants of a potato of a steady grade prelanding heat treatment 45 °С had some stimulating influence which was expressed in intensity of colouring of leaves and a thickening of stalks.