Research aim was to test the tolerance of a range of maize hybrids to infectious pressure of the pathogen Ustilago maydis in climatic conditions from Timisoara Didactic Research Station. Stage of research is being characteristic for partial interpretation of experimental data after the first experimental year, in preparation the doctoral thesis. Materials and methods . Experimental field was located in climatic conditions of Timisoara Didactic Research Station. Technology was the standard applied to this area. The experience was bifactorial. First factor was the hybrid grown with six graduations, provenance hybrids was Monsanto with different vegetation periods, (DKC 3511, DKC 4626, DKC 4964, DKC 4983, DKC 5783 and DKC 5170). Factor B was the amount of nitrogen applied to three graduations (N 0 , N 100 and N 200 ) all three doses were applied on a constant background elements of P 80 K 80 . The novelty is relatively high, work providing important data for agricultural practice from hybrids point of view for the experimental area. Achievements stage in this field. In this work were carried out research including one of authors, known as the reference and possible reactions of the pathogen depending on local biocoenosis factors. Limits of the research are that data from the fungus Ustilago maydis are just after two years of pathogen bonitation. Practical implications of the research consisted of playing a part of a complex study of strategy in the protection of maize reference experience. The originality of the work comes from the fact that data are relevant in view of uniformity of hybrid origin, these data are only part of the data submitted for interpretation in the preparation of the PhD thesis of the main author. Importance of the paper became from bringing in front of the specialists of one of the topics in the experiences of the author's doctoral preparing, to evaluate the accuracy of techniques addressed. The relevance of data , experimental results give an overview of pathogen behavior in relation to hybrids experienced by groups of precocity.

Ustilago maydis, plant tolerance, nitrogen amount

Presentation: oral