In vitro susceptibility of Erwinia Amylovora (Burrill) Winslow et al. strain isolated from pear to several plant extracts and different pesticides

English. In less than six months after infection, Erwinia amylovora may completely destroy a pome tree. This paper aims to increase awareness of the potential for developing plant protection strategies based on natural products. Since the damage caused by this bacterium are unrecoverable, we tested in vitro the effectiveness of a several plant extracts such as Salvia officinalis, Thymus serpyllum, Pelargonium odoratissimum, Hedera helix, Ocimum basilicum, Levisticum officinale, Tagetes patula, Galium verum and some pesticide products, on a strain of Erwinia amylovora isolated from the pomological collection of ”Vasile Adamachi” farm, the University of Agricultural Sciences and Veterinary Medicine, Iasi. The strain was isolated from damaged pear shoots, after performing patogenicity test on immature pear fruits. Following the experiment conducted, copper oxychloride (Alcupral 50 PU) and Pelargonium odoratissimum showed a very good antibacterial activity against EA - A.P. strain.

Romanian; Moldavian; Moldovan. Bacteria Erwinia amylovora poate distruge un pom, in totalitate, in mai putin de sase luni de la realizarea infectiei. Aceasta lucrare are in vedere dezvoltarea unor strategii de protectie a plantelor, bazate pe produse naturale. Intrucit pagubele produse de aceasta bacterie sunt irecuperabile, ne propunem prin acest studiu sa testam, in vitro, o serie de extracte de plante, precum Salvia officinalis, Thymus serpyllum, Pelargonium odoratissimum, Hedera helix, Ocimum basilicum, Levisticum officinale, Tagetes patula, Galium verum, si unele produse pesticide, pentru a verifica eficacitatea acestora asupra unei suse de Erwinia amylovora, izolata din colectia pomologica a fermei “Vasile Adamachi”, din cadrul Universitatii de Stiinte Agricole si Medicina Veterinara Iasi. Susa a fost izolata din ramurile de par atacate, in urma testului de patogenitate, realizat pe fructele de pere verzi. Oxiclorura de cupru (Alcupral 50 PU) si Pelargonium odoratissimum au prezentat, in urma experimentului efectuat, cea mai buna activitate antibacteriana impotriva susei E.A. - A.P.