IDENTIFICATION OF SOME POTATO CLONES WITH RELATIVE RESISTANCE TO LATE BLIGHT (Phytophthora infestans) IN CENTRAL PART OF ROMANIA

In the National Institute of Research and Development for Potato and Sugar Beet Brasov, sixteen potato clones were evaluated to find the relative resistant one to late blight (Phytophthora infestans) and thereby diminish the number of fungicide sprays required. In the two years of study the presence of clones relatively resistant, which allows the development of an adequate protection strategy and the possibility to reduce the number of treatments has been observed. Disease development on foliage was assessed as percentage of foliage area damaged. The research was conducted under natural pressure of infection. From all clones studied, 1895/1, 1901/11 and 1895/4 showed the lowest level of resistance on the foliage, followed by 1927/1, 1941/8 and 1939/2. Instead, the clones 1901/6, 1930/ and, 1979/5 were located towards the upper limit of resistance on the foliage during the entire vegetation period.