Recently, a new plant disease was detected in the rural area of the High Valley of Río Negro, in Northern Patagonia, Argentina, called “Brown Spot of Pear” (BSP), caused by Stemphylium vesicarium (teleomorph: Pleospora herbarum, syn. Pantoea allii) in its sexual and asexual stages which produces lesions on leaves and fruits. BSP has been reported previously in pear growing areas of Europe and Japan where research studies have assessed the production of two host-specific toxins (HSTs) in culture filtrates of S. vesicarium (SV-I and SV-II toxin). The purpose of the present study was to characterize Stemphylium isolates from air and from brown spot lesions on pear leaves and fruits grown in this rural area, at a morphological, molecular and pathogenic level. The pathogen’s identity was determined as S. vesicarium and its aggressiveness and toxicity were demonstrated through conidia and culture filtrate bioassays showing different degrees of pathogenicity. D’Anjou and Abate Fetel were the most susceptible pear cultivars to S. vesicarium isolates.

最近，在阿根廷巴塔哥尼亚北部的 Río Negro 高谷的农村地区发现了一种新的植物病害，称为“梨褐斑病”（BSP），它是由Stemphylium v​​esicarium (teleomorph: Pleospora herbarum , syn. Pantoea ) 引起的。 allii ) 在其有性和无性阶段对叶子和果实产生损害。BSP 之前曾在欧洲和日本的梨种植区报道，那里的研究评估了葡萄球菌培养滤液（SV-I 和 SV-II 毒素）中两种宿主特异性毒素 (HST) 的产生。本研究的目的是表征Stemphylium从空气和该农村地区种植的梨叶和果实的褐斑病斑中分离出，在形态、分子和致病水平上。病原体的身份被确定为S. vesicarium并且通过显示不同程度的致病性的分生孢子和培养滤液生物测定证明了其侵袭性和毒性。D'Anjou 和 Abate Fetel 是对S. vesicarium分离株最敏感的梨品种。