The objective of our researches was to identify the varieties with associated resistance to diseases and pests – an important objective for the rationalizing and reduction of the chemical treatments, production expenses and, implicitly, of the environmental pollution. We have observed a significant presence of the pest Leucoptera scitella Zell in the apple orchard belonging to the Didactic Station Timisoara, in 2006. This has determined us to begin the researches upon the apple tree behaviour. The observations carried out during the last decade of August, when the attack was maximal, have led to the conclusions that: the varieties Florina and Pionier were slightly attacked, proving a good resistance (RB) towards the attack of this pest, the varieties Generos and Romus were moderately attacked (RM), and the variety Ionathan was strongly attacked (RS).

pear; hybrid elite; variety; diseases

Presentation: oral