During some rainy years, water melons can be affected by a series of pathogenic agents that might produce, in some situations, some important damages. One of these pathogenic agents is the downy mildew produced by Pseudoperonospora cubensis (Berk. et Curt.) Rostov. The aim of the research was to establish the moments of disease apparition, favouring factors for starting the attack, as well as the possibilities of prevention and fight. Downy mildew was the subject of some thorough studies of the cucumbers, both in the field and in protected spaces (green houses, solariums). Nowadays, unlike the cucumber, the level of the researchers in this domain, in the proper area, both to the water melon and to the yellow melon, is practically inexistent.  For making the notices, there have been organized experiences that respected the requests of an experimental technique. The experimented methods included different schemes of treatment + the witness method – 0 treatments. For interpretation of the results, there has been used the statistic analysis, according to the experimental technique. For the respective area, research has a great practical importance, as in some certain years, the pathogenic  agents can cause great damages, being for many times the decisive factor for obtaining some good productions in quantity and especially in quality.  During observations, more attention for the meteorological factors has been paid: the average temperature, precipitations, relative humidity of air and humidity on leaves (the dew).

mildew; watermelon; pathogenous agent

Presentation: oral