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首页> 外文期刊>Acta Horticulturae >Etiology of a pear decline disease in Italy and susceptibility of pear variety and rootstock to phytoplasma-associated pear decline
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Etiology of a pear decline disease in Italy and susceptibility of pear variety and rootstock to phytoplasma-associated pear decline

机译：意大利梨衰退病的病因学和梨品种和砧木对与等离子相关的梨衰退的敏感性

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摘要

A pear tree syndrome characterized by premature leaf reddening and fall is common in orchards of central and northern Italy. It is mainly a problem in young orchards of the cultivars Comice, Williams [Williams' Bon Chretien], Abate Fetel and Kaiserpropagated on quince or seedling rootstocks. Decline symptoms were also observed in trees of several cultivars growing on their own rootstocks. Phytoplasmas detected by fluorescence microscopy were strongly associated with the leaf reddening condition. Apreliminary survey indicated that Conference trees are only slightly affected, regardless of the type of rootstock, while Comice trees showed more intense leaf symptoms on seedlings of Pyrus communis than on quince rootstocks, and Abate Fetel, Kaiser and Williams trees showed about the same susceptibility on both rootstocks. Own-rooted Comice trees showed the strongest symptoms, while there were no symptoms on own-rooted Conference trees, even when heavily infected with phytoplasmas. Regarding the rootstocks, tree on P. communis seedlings, quince BA 29 and quince CTS 212 showed about the same symptom intensity which was less severe than that presented by trees on quince A, quince C or the clonal rootstock OHF333.
机译：在意大利中部和北部的果园中，梨树综合症的特征是叶片过早变红和掉落。这主要是在木薯或幼苗砧木上繁殖的Comice，Williams [Williams'Bon Chretien]，Abate Fetel和Kaiser等幼果园中的问题。在自己的砧木上生长的几个品种的树木中也观察到了下降的症状。通过荧光显微镜检出的植原体与叶片变红状况密切相关。事前调查表明，无论砧木的种类如何，会议树的影响都较小，而喜剧树在P梨幼苗上的叶子症状要比木瓜砧木更强烈，而Abate Fetel，Kaiser和Williams的树苗对木薯的敏感性相同。两种砧木。根深蒂固的喜剧树表现出最强的症状，而根深蒂固的会议树则没有症状，即使严重感染了植物浆原体也是如此。关于砧木，木瓜幼苗29，木瓜BA 29和木瓜CTS 212表现出大致相同的症状强度，但强度不如木瓜A，木瓜C或无性砧木OHF333。

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