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POWDERY MILDEW, A PATHOGEN OF OENOTHERA BIENNIS ON WILD FLORA FROM SOUTH-WESTERN PART OF ROMANIA
Abstract
On the last two years, there was carried out some research work on the medicinal plants from wild flora. All the research was done on the area of Nera river basin because this region is a protected area and has a very large biodiversity. As far as we know on this area there are over 1000 species of superior plants classified on 98 families. One of this plants growing on this region is Oenothera biennis. One of this plant pathogens is powdery mildew produced by one of Erysiphe genus species. Regarding to the work method, all observation data were collected during vegetation period of years 2015 and 2016. In this paper there are presented only averages of data collected during the time period mentioned previously. Our observations consist from two separate operations. First operation was to determine inside of observation area the place and the density of the most representative populations of Oenothera biennis. The second operation was to see if those plants are affected of some pathogens and the third operation was to evaluate the attack parameters of each pathogen. One of the pathogens present on both years when observations were performed was Erysiphe sp. The novelty is relatively high because this work provides important data for both agricultural practices (especially for breeding process) and also for local environment protection authorities. Oenothera biennis seeds are used to extract faty essential acids used by human body on preliminary stage in the production of the tissue hormone prostaglandin, but due to aging human body at a certain moment canпїЅt produce enough quantity of this substance which have as effect some of most known aging disorders. Taking in consideration this facts this herb could become a cultivated medicinal plant used in some pharmaceutical and cosmetic industry products. From this point of view it is important to know the infection pressure of the plants pathogens from natural environment. We appreciate that the plants from wild flora related to cultivated plants are considered to be a consistent source for diseases resistance genes in the plant breeding process. Limits of the research are that the data from the research come from just from two years of observations and greatly influenced by local climatic and soil factors.
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