Dynamics of apparition and evolution to the melon (Cucumis melo L.) of the fungi attack Verticillium dahliae Kleb., wich leads to Verticillium wilt in the droughty years 2002 and 2003 and the rainy years 2004 and 2005 in conditions of the Baragan field, Braila area

The pathogenous appears each year with different intensities and degrees of attack, firstly in accordance with the meteorological factors. The attack is stronger in draughty and hot years. In rainy and cold years, the attack of the fungus does not create problems. In order to reduce the damages produced by this pathogenous, there have been studied the factors which determine apparition and evolution of the attack. In this respect, it has been given a special importance to the first symptoms, to the evolution of these symptoms in accordance with the meteorological factors (precipitations, medium temperature, medium humidity of air, dew). After apparition, in the draughty and hot years of 2002 and 2003, the disease had a faster evolution and a higher degree of attack of 13,75% and respectively 11,70% at the end of August. In 2004 and 2005, rainy and cold years, the disease had a slower evolution of 3,16% and respectively 1,57% in the second half of August

Behaviour of some species and hybrids of melons to the attack of some specific pathogenous agents: virosis, mildew - Pseudoperonospora cubensis Rostov., Anthracnosis – colletotrichum lagenarium (Pass.) Ell. et Hals. and Verticillium wilt – Verticillium dahliae kleb., in 2002, 2003, 2004 and 2005

Resistance, tolerance or on contrary, sensibility of these species or hybrids to the important pathogenous agents are basic factors for obtaining a good production and a maximum profit to the melons. For this reason, different species and different hybrids have been tested during four years (2002, 2003, 2004 and 2005), within some comparative cultures of orientation. In 2002 there were tested 5 species and 3 hybrids, in 2003: 3 hybrids and 2 species, in 2004: 3 hybrids and 2 species and in 2005:7 hybrids. Experiences were performed during all those 4 years according to the rules of the experimental technique (placement in the field, statistic calculus of the experimental error). To these species and hybrids there have been noticed the dynamics of apparition and evolution of the agents mentioned in the title of this paper. Between the studied species and hybrids there have been recorded real differences regarding their behavior to the attack of the mentioned pathogenous agent