Research on the behavior of some winter wheat cultivars at the attack of pathogens under natural infection condition, in the Northeast area of Moldova

Wheat crop are damaged by numerous pathogens which cause diseases which produce quantitative and qualitative yield losses under Moldovian area pedoclimatic conditions. It is well know that wheat is one of the most important crop for world agriculture and the continuous diversification of the wheat range varieties can be an effective measure for increasing and stabilizing wheat production. This paper presents the research results concerning the behavior of 32 Romanian winter wheat cultivars, based on the data obtained during 2015-2017, performing at Didactic Station Iasi - Ezăreni Farm. The research was designed according to the randomized block method in three replications, containing 25 variants; every variant was represented by one of the winter wheat cultivars. The control variant of the experience was the Bezostaia 1 wheat variety. The winter wheat varieties under study exhibited a wide variability over the studied factors. During the study period, the pathogens present in the winter wheat crop were represented by Blumeria graminis f.sp. tritici (DC) Speer., Septoria tritici Rob. et Desm. and Puccinia recondita f.sp. tritici Rob. et Desm. The degree of attack (DA%) of pathogens were determined with frequency (F%) and intensity (I%) of attack