Evaluation of BC Williams and PI1/6 pear cultivars for their compatibility with 49 quince genotypes and their susceptibility to fire blight: Short communicaton

Abstract

ABSTRACT:In this study, the compatibility of the pear cultivars PI1/6 and BC Williams with 49 quince genotypes was evaluated. The results showed that the cv. PI1/6 had a good compatibility with several of the quince genotypes, and the cv. BC Williams only with a few of them. Differences were also found in their susceptibility to fire blight (Erwinia amylovora). The cultivar PI1/6 was very susceptible, while the cultivar BC Williams was relatively tolerant. RESULTS AND DISCUSSIONThe compatibility between rootstock and cultivar is a crucial factor that should be considered before making the decision to establish a pear orchard. The quince rootstocks are widely used in pear orchards, because of their good adaptation in Greek soil and climate conditions; they are also suitable Values are the mean of 5 consecutive years (Rivalta et al. 1989a,b;Sansavini et al. 1997).The results also showed that the cultivar PI1/6 was very susceptible (mean of index = 7.8), while the cultivar BC Williams was rather tolerant (mean of index = 4.3) ( Table 2). Ten of the PI1/6 trees died during the experiments; in contrast, no BC Williams tree died. The susceptibility of PI1/6 to fire blight was probably due to its parent Kontoula which is very susceptible to this disease (unpublished data). BC Williams has been reported as a moderately susceptible cultivar to fire blight (Al-Dahmashi, Khlaif 2004;Severin et al. 1999). Hodnocení afinity odrůd hrušní BC Williams a PI1/6 se 49 genotypy kdouloní a jejich citlivosti ke spále růžokvětých ABSTRAKT: Práce je zaměřena na hodnocení roubové snášenlivosti odrůd BC Williams a PI1/6 se 49 genotypy kdouloní. Část těchto genotypů měla dobrou afinitu s novou řeckou odrůdou PI1/6 a několik z nich i s odrůdou BC Williams. Rozdíly mezi těmito odrůdami byly nalezeny i po stránce jejich citlivosti ke spále růžokvětých (Erwinia amylovora). Odrůda PI1/6 byla velmi citlivá, zatímco odrůda BC Williams byla vůči této chorobě relativně tolerantní.