Study upon the Alternaria solani Sorauer Attack Degree on Potato Cultures Function of Climatic Conditions from Transylvania

Andrei FLEȘERIU, Ioan Gheorghe OROIAN, Cristian MÄ‚LINAȘ, Ioan BRAȘOVEAN, Bianca BORDEANU

Abstract


Literature and practice show that in order to make plant protection strategies, you need a very good knowledge of the mode of manifestation of main pathogens encountered worldwide. The pathogen Alternaria solani Sorauer in conjunction with the abiotic factors as temperature and rainfall regimen may produce important potato crop looses. The aim of this study is to demonstrate the possibility of using meta-models represented by the multiple correlation anaysis in emphasizing relationship between the climatic conditions and intensity alternariosis attack degree.Experiments were conducted in ten points, from April to September, during three consecutive years, 2009, 2010 and 2011. Vegetable private farms (where Roclas potato variety is cultivated), located within the 10 counties of Transylvania, have been selected. Temperature and rainfall regimen developments, throughout experimental period, were obtained from the county environmental protection agencies. Data processing was performed with STATISTICA v 6.0 version.There have been calculated the multiple correlations between the Alternaria solani Sorauer attack degree and abiotic factors. The interrelationships between Alternaria solani Sorauer attack degrees and temperature and rainfall regimen were within the range 0.939 - 0.866.By entire experimental three years period, the rainfall regimen had 23 folds higher influence on Alternaria solani Sorauer attack degree upon potato cultures, compared to temperature. Our trial shows the importance of using meta-models for anaccurate quantification of the relationship between the climatic conditions and intensity of alternariosis attack degree.


Keywords


alternariosis, Roclas, multiple correlation, regression line.

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