Garibaldi A, Bertetti D, Gullino M L
DIVAPRA and Centre of Competence for the Innovation in the Agro-Environmental Sector (AGROINNOVA), Via Leonardo da Vinci 44, 10095 Grugliasco, Italy.
Plant Dis. 2004 Sep;88(9):1045. doi: 10.1094/PDIS.2004.88.9.1045B.
Honeysuckle (Lonicera caprifolium L., family Caprifoliaceae) is a climbing shrub used in gardens to cover walls and supports. During the summer of 2003, severe outbreaks of a previously unknown powdery mildew were observed on this species in some gardens near Biella (northern Italy). The first symptoms included extensive chlorosis on leaves, followed by the appearance of white mycelium on the adaxial and abaxial leaf surfaces. As the disease progressed, infected leaves turned yellow and died. Conidia were hyaline, ellipsoidal, and measured 27.6 to 43.2 × 12.2 to 21.6 μm (average 35.7 × 17.6 μm). Foot cells were cylindric and appressoria lobed. Fibrosin bodies were not present. Cleistothecia were not observed during the growing season. The pathogen was identified as Oidium subgenus Pseudoidium (2). The inoculation procedure involved gently pressing diseased leaves onto leaves of healthy L. caprifolium plants. Three plants of L. caprifolium were used as replicates. Noninoculated plants served as control. Inoculated and noninoculated plants were maintained in a garden at temperatures ranging from 15 to 25°C. After 10 days, typical symptoms of powdery mildew developed on inoculated plants. Noninoculated plants did not show symptoms. To our knowledge, this is the first report of powdery mildew on L. caprifolium in Italy. The presence of powdery mildew on different species of Lonicera has been reported in several countries, particularly, Microsphaera miurae U. Braun on L. morowii A. Gray in Germany (1), M. lonicerae (DC.) Winter on L. peryclimenum L. in England (3), and M. lonicerae-ramosissimae on L. ramosissima Fr. & Sav. in Japan (4). The conidia of M. lonicerae are smaller than those of the Oidium sp. reported on L. caprifolium. Voucher specimens are available at DIVAPRA Collection at the University of Torino. References: (1) U. Braun. Mycotaxon 16:417, 1983. (2) U. Braun and S. Takamatsu. Schlechtendalia 4:1, 2000. (3) J. Robbins. Cecidology 15:15, 2000. (4) S. Tanda. Mycoscience 41:155, 2000.
忍冬（忍冬科的意大利忍冬Lonicera caprifolium L.）是一种攀缘灌木，常用于花园中覆盖墙壁和支撑物。2003年夏季，在比耶拉（意大利北部）附近的一些花园中，该物种上出现了一种此前未知的白粉病严重暴发情况。最初症状包括叶片广泛黄化，随后在叶片正面和背面出现白色菌丝体。随着病情发展，受感染叶片变黄并死亡。分生孢子无色透明，椭圆形，大小为27.6至43.2×12.2至21.6μm（平均35.7×17.6μm）。基部细胞呈圆柱形，附着胞有裂片。无纤维状小体。在生长季节未观察到闭囊壳。该病原菌被鉴定为拟粉孢属（Oidium subgenus Pseudoidium）（2）。接种过程是将病叶轻轻按压到健康的意大利忍冬植株叶片上。以三株意大利忍冬作为重复样本。未接种的植株作为对照。接种和未接种的植株置于温度为15至25°C的花园中。10天后，接种植株上出现了典型的白粉病症状。未接种植株未表现出症状。据我们所知，这是意大利关于意大利忍冬白粉病的首次报道。在几个国家都有报道不同忍冬属物种上存在白粉病，特别是在德国，忍冬L. morowii A. Gray上的三浦球针壳Microsphaera miurae U. Braun（1）；在英国，欧洲忍冬L. peryclimenum L.上的忍冬球针壳M. lonicerae (DC.) Winter（3）；以及在日本，细毡毛忍冬L. ramosissima Fr. & Sav.上的忍冬球针壳小枝变种M. lonicerae-ramosissimae（4）。忍冬球针壳的分生孢子比报道的意大利忍冬上的拟粉孢属真菌的分生孢子小。凭证标本保存在都灵大学的DIVAPRA标本馆。参考文献：（1）U. Braun. Mycotaxon 16:417, 19,83.（2）U. Braun和S. Takamatsu. Schlechtendalia 4:1, 2000.（3）J. Robbins. Cecidology 15:15, 2000.（4）S. Tanda. Mycoscience 41:155, 2000.
