Rating the resistance of tomato (\kur{Lycopesicum annum }L.) cultivars to late blight (\kur{Phytophthora infestans})

The aim of this thesis was to evaluate resistent varieties of tomato in the term of susceptibility to late blight. Late blight , caused by P. infestans, is the most destructive foliar disease of tomato. Some new sorts declare the resistence to late blight. The aim of our thesis was to evaluate how these varieties perform in Czech republic. It was established experiment with 14 resistent and 2 control varieties. The leaves of the plants were examined routinely for symptoms of late blight and the severity of them was recorded. The varieties Mountain Magic, De Barao, Cherry Bomb, Tomato Des Comodores, Matts Wild Cherry a Plum Regal proved high level of resistence to late blight. The varieties Phantasia, Phytovia and Mountain Merit showed lower level of resistence. Growing new varieties, with resistence to late blight can enable the reduction of fungicidal protection of tomatoes and for organical and hobby growers to make possible growing tomatoes without use of pesticides