The research conducted in 2010-2011 had in view the behaviour of eight raspberry varieties (Rubus idaeus) and 11 blackberry varieties (Rubus fructicosus), of which 7 thorny and 4 thornless cultivars, exposed to yellow rust (Phragmidium rubi idaei) and grey mould attacks (Botrytis cinerea), in intensive cropping system. The main aim of this study has been to develop a cultivar for the Bacau area that is resistant to phyto-pathogenic attacks (rust and mould) and to breed it in the nursery, taking into consideration the frequency (F%), intensity (I%) and gravity of attack (GA) values. The cultivars recommended for nursery breeding, due to the fact that they have registered the lowest attack degree (GA %), are Thornfree (0.42%), Loganberry (0.2%), Evergreen (0.008%) thornless blackberries and Arkansas 530 (0,08%), Arkansas 535(0,531%), Arkansas 609(0,24%) for thorny blackberries; as far as raspberry varieties are concerned, their GA values ranged from 0.13% for Exploit to 0.14% GA in Newburg and 0.16% in English A1.