The effect of the common pesticides in the Khoy city on bacterial canker of stone fruits

Pseudomonas syringae pv. syringae is one of the most important plant pathogenic bacteria that causes canker, leaf spot and die-back in stone fruit trees and considerableyield losses in these trees. During this study, from 2015 to 2016 in different areas of the Khoy (Firooragh- Rahal-Boozghoosh) many stone fruits orchards were surveyed and some suspected plant samples with canker symptom were collected.Based on biochemical tests the causal agent of bacterial canker of stone fruits in this area was primarily identified. For molecular identification of selected isolates, polymerase chain reaction (PCR) was performed using a specific primer. In PCR assay with primers B1 and B2 on pathovars of Pseudomonassyringaepv. syringae (Pss), a 752bp fragment was amplified from the 3 isolates. Theeffect of 10 common and mostly used pesticides in Khoy, including Diazinon, Phosalone, Chlorpyrifos, Imidacloprid, Captan, Penconazol, Benomyl, Hexythiazox, Bromopropylate, and Haloxyfop-R-Methyl were evaluated on the population of bacterial isolates of Pss in vitro. Among the selected pesticides, Chlorpyrifos increases the bacterial population and nine other pesticides include Diazinon, Phosalone, Benomyl, Penconazol, Haloxyfop-RMethyl, Bromopropylate, Imidacloprid, Hexythiazox and Captan were reduced the pathogen population.

کلیدواژه ها:

Stone fruit trees ، Bacterial canker ، Antibiotics ، Pseudomonas syringae pv. Syringae