Fire blight is considered the most damaging disease of seed trees and the pathogen  is one of the most studied. Since the damage caused by Erwinia amylovora is large and irrecoverable we intend to control the bacteria . Isolated from a nursery stock located in Sârca, Iasi, Erwinia amylovora strain was sown on two culture media NSA (Nutrient Sucrose Agar) and King B, and later it was tested the effectiveness of some products to control the pathogen. Eleven products were used three pesticides and eight plant extracts : Salvia officinalis, Thymus serpyllum, Pelargonium odoratissimum, Hedera helix, Ocimum basilicum, Levisticum officinale, Tagetes patula and Galium verum. Out of the eight plant extracts five presented a good antibacterial activity. Erwinia amylovora formed colonies with a diameter less than 1 cm on King B medium mixed with Tagetes patula, Galium verum, Ocimum basilicum, Pelargonium odoratissimum, Alcupral 50 PU and Salvia officinalis. From the three fungicides tested in vitro the lowest antibacterial activity was recorded on culture media mixed with Aliette 80 WG. The results were interpreted statistically using ANOVA test.

fire blight, bacteria, Alcupral 50 PU

Presentation: oral