Estimation of resistance pear cultivars to Erwinia amylovora using artificial immature pear fruits method

Abstract

Susceptibility of different pear cultivars to Erwinia amaylovora by artificial inoculated immature pear fruits are shown in this article. According obtained results significant differences among cultivars are confirmed and they could be divided in four groups. Most susceptibly cultivars were Santa Marija. Second group includes Williams, Morettini, Carmen, Hardenpont. As most resistant shown to be Magness, Turandot and two local varietyies Karamanka, as well as another unknown local cultivar. This results are compatible with literature data, but also confirmed observations about susceptibility of various pear cultivars to E. amylovora under natural infections. Artificial inoculation immature pear fruit could be considered as relativelu relible method for estimation of pear fruit trees resistance to this bacteria.

U radu je prikazana reakcija plodova različitih sorata kruške prema Erwinia amylovora metodom inokulacije nesazrelih plodova. Utvrđeno je da postoje značajne razlike u osetljivosti raznih sorata kruške prema patogenu i one se mogu podeliti u četiri grupe prema korišćenoj skali. Najosetljivijom se pokazala sorta Santa Marija. Nešto manju osetljivost ispoljile su sorte Vilijamova, Moretini, Karmen i Hardenpont; najotpornijim su se pokazale Magnes, Turandot, Junska Lepotica, Karamanka i nepoznata autohtona sorta. Prema dosadašnjim saznanjima ovi rezultati su u saglasnosti sa podacima iz literature i zapažanjima o otpornosti sorti kruške prema E. amylovora, primenom metode inokulacije plodova. Istraživanja su pokazala da se ovakav metod utvrđivanja otpornosti kruške prema E. amylovora sa relativnom pouzdanošću može koristiti u ove svrhe.