Document Type : Plant Pathology

Author

• Naser Amanifar

Researcher

Abstract

Bacterial canker is a significant disease affecting stone fruit trees in cold regions. The incidence and severity of the disease can vary depending on factors such as rootstock, cultivar, orchard management, and other predisposing conditions. In this study, the response of commercial almond and peach cultivars in Chaharmahal va Bakhtiary province to Pseudomonas syringae pv. syringae (Pss) and Pseudomonas syringae pv. morsprunorum (Psm) was evaluated using both seedlings and detached branches. The results indicated a notable difference in disease severity (canker length) among cultivars and isolates of the two pathovars. All almond cultivars displayed varying degrees of susceptibility, with Shahroud 12 (Ferragnes), Pooya, Shahroud 7 (Ferraduel), Rabie, and Mamaee exhibiting the highest disease severity and bud death. Additionally, there was a significant variance in pathogenicity indexes (disease severity, bud death, and dieback) between the two pathovars, Pss and Psm. Peach cultivars also exhibited distinct reactions to the bacteria. The local cultivar Zaafarani was the most sensitive, while Kardi was identified as a tolerant cultivar. GH Hill and Elberta were considered sensitive cultivars as well. In almond, bud death and disease severity caused by Pss were greater than those caused by Psm, whereas in peach, the opposite was observed. Overall, none of the almond and peach cultivars studied in this research demonstrated resistance to the bacterial canker pathogens.

Keywords

• almond
• bacterial canker
• correlation

Main Subjects

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