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首页> 外文期刊>Plant Disease >First report of Sclerotinia stem and twig blight caused by Sclerotinia sclerotiorum on Citrus volkameriana rootstock in Italy.
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First report of Sclerotinia stem and twig blight caused by Sclerotinia sclerotiorum on Citrus volkameriana rootstock in Italy.

机译：在意大利的柑橘（Citrus volkameriana）砧木上，由菌核盘菌（Sclerotinia sclerotiorum）引起的菌核菌茎杆和枯萎病的首次报道。

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摘要

Volkamer lemon (Citrus volkameriana) is the most commonly used rootstock for some ornamental citrus (oval kumquat and calamondin), improving the aesthetic quality of the plants and their marketable value. During the winter of 2011, symptoms of stem blight were observed on approximately 10% of 12 000 one-year-old potted C. volkameriana seedlings grown in different blocks in a commercial nursery near Catania (eastern Sicily, Italy). In the same nursery, only 1% of 15 000 older seedlings (2-year-old) showed disease symptoms. Initial symptoms included gray lesions on stems and occasionally on twigs. Later, buff lesions and gum exude appeared. Symptomatic stems and twigs were usually girdled and killed. In the lesions, irregular, dark gray sclerotia (1.0 to 5 x 1.0 to 7.0 mm, average 2.5 x 3.9 mm) were produced. In high relative humidiy, cottony, white mycelia on the bark surface of infected tissues were also observed. Based on morphological characteristics, sequence analysis of the rDNA internal transcribed spacer region and pathogenicity tests, the causal agent was identified as S. sclerotiorum. This is thought to be the first report of S. sclerotiorum stem and twig blight on C. volkameriana. Worldwide, Scerotinia stem and twig blight is considered a minor disease on citrus, but this evidence suggests that in eastern Sicily, S. sclerotiorum may be an important pathogen of young C. volkameriana seedlings in nurseries.
机译：Volkamer柠檬（ Citrus volkameriana ）是某些观赏柑橘（卵形金橘和calamondin）最常用的砧木，可改善植物的美学品质并提高其市场价值。在2011年冬季，在12000岁一岁盆栽iC中约有10％观察到枯萎病症状。在卡塔尼亚（意大利西西里岛东部）附近的商业苗圃中，在不同块中生长的volkameriana 幼苗。在同一个苗圃中，15,000棵老树苗（2岁）中只有1％表现出疾病症状。最初的症状包括茎部有灰色病变，偶尔有树枝。后来，浅黄色的皮损和牙龈渗出。有症状的茎和小枝通常被束紧并杀死。在病变中，产生不规则的深灰色菌核（1.0至5 x 1.0至7.0 mm，平均2.5 x 3.9 mm）。在较高的相对湿度下，在被感染组织的树皮表面也观察到了棉质，白色菌丝体。根据形态特征，rDNA内部转录间隔区的序列分析和致病性测试，确定病因为 S。硬化菌。这被认为是 S的第一份报告。 C菌核茎和树枝枯萎。 volkameriana 。在世界范围内，Serotinia茎和树枝枯萎病被认为是柑橘类的一种小病，但是这一证据表明在西西里岛东部， S。硬化菌可能是年轻 C的重要病原体。苗圃中的volkameriana 幼苗。

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