RESEARCH REGARDING THE INFLUENCE OF DIFFERENT FUNGICIDE TREATMENTS UPON THE FOLIAR SUFACE INTEX (LAI) TO THE OILSEED RAPE

The recognition of major pest species in the vineyards of our country, the way of plants jury, the importance and the economic impact on production targets, is essential to protect plants and to productive increase. Tetranychus urticae is the species reported from all continents, being considered one of the most ubiquitous species of pests in agriculture. In Romania is widespread in all areas of vegetation, as reported in the active state the most important crops from March-April until late November.The main objective of this study was to monitor the progress of Tetranychus urticae attack to the vine plantation/vineyard from the town Sag (Timis county). Spiders of this species colonize the lower leaves and stings they produce, tissue cells are emptied from after the absorption of sap. Acarologic material was taken was done by the acarologic method of Pierre Galet - the percentage method of the occupied leaves. Were analyzed 10 vines randomly taken from each hectare. Each leaf was observed with a pocket magnifying glass and leaves were separated from those that were occupied by at least one mite Tetranychus urticae the species. Separate leaves were then counted and accomplished the percentage of leaves occupied made of this species. In 2009, the highest percentage of attacked leaves were collected in July and August (97.5% and 91%), and the September attack frequency decreased significantly due to a decrease in temperature during autumn. In 2010, in Sag has been found a large number of leaves attacked by Tetranychus urticae in all five months of monitoring. Because of the fact that in the time period studied 2009 - 2010, the weather conditions were favorable to the development of harmful species of Tetranychus urticae and existing large reserve as well as the lack of prevention and control work were very little (or none), and the density number of this species vine leaves was high.