RECHEARCH REGARDIN OF PATOGENS AGENTS FROM FOREST CULTURES IN THE 2006 YEAR

SUMMARY The present state of our country’s forests is chara cterized by decline, pressure and stress factors, w hich greatly influence their integrity and continuity. Therefore it is imperative that the sylviculturists take immediate drastic action for the ecological reconstruction an d restoration of the forests. In this context, it is necessary, among other conservation measures, to afforest and refore st entire areas, both in normal and extreme resorts . To achieve this, it is required that the forestatio n material be produced in the appropriate quantity, quality and variety for the process. This objective can be achieved only when applying modern methods and a modern technology for the prevention and control of the pathogenic agents to be found in solarium and nurseries. Research has been carried out aiming at determining the diseases and their causes in nurseries and plantations as well as establishing the control met hods and techniques. Thus we tried to: identify the pathogenic agents that frequently lead to loses in nurseries a nd solarium; know the main pathogenic agents from the point of view of biology, etiology and of modern control tec hnologies; establish efficacy for a large spectrum of fungicides and of the applicable doses and concentrations, res pectively; establish the optimal phenological stage s of treatment application. As a result of the research and experiments carried out over the last year we conclude the following: a).The most dangerous pathogenic agents remain Laphodermium pinastri and Septoria parasitica for resinous plants, Dothiochiza populea and Cytospora chysosperma for Euro American poplars. b).The pathogens responsable of the plantlets “damp ing-off”, which is: Fusarium spp., Rhizoctonia solani, Pythium ultimum, Alternaria spp.,etc. The most varied mycoflora was observed in soil nutrition, and resinous seed. c).There is a large spectrum of new fungicides whic h can efficiently control mildew in the case of oak plants or other diseases present in nurseries, plan tations or regenerations and forest solaria. d).The fungicides Systhane, Karathne and Alert performed very well in experiments proving a n efficacy of up to 90% in the control of oak-plant mildew produced by the pathogen Microspaera abbreviata (f.c. Oidiu alphitoides). e).We registered the fungicides Systhane and Folpan and the Inter-ministry Commission for the control of mildew and soil pathogens. f).The fungicides Alert and Karathne with very good results are to be tested for another year for clarifications regarding the most efficient concent ration. g).The fungicides Previcur performs very well in co ntrolling the pathogens in solaria therefore the experimental biological sheet was made with respect to its registration. h).What is extremely important for the prevention o f pathogen agent infections is the moment of the treatment application and this timing varies with t he climatic factors, consequently prevention treat ments are recommended i).The obtained results can be applied in all the a rea and ranger districts whose activity is the prod uction of forest saplings, in solaria or/and nurseries; these are to apply the products and technologies present ed in this study.

Перевод пока недоступен