Dal Bello G, Perelló A
Facultad de Ciencias Agrarias y Forestales de la Universidad Nacional de La Plata, Fitopatología, CIC-CONICET. 60 y 119 (1900) La Plata, Buenos Aires, Argentina.
Plant Dis. 1998 Sep;82(9):1062. doi: 10.1094/PDIS.1998.82.9.1062A.
During March, 1997, a leaf rust was observed on Vaccinium corymbosum L. cv. Bluegold in Argentina. Leaf lesions began as chlorotic flecks that expanded and developed into necrotic spots with several uredinia. The typical orange pustules of the disease developed mostly on the abaxial sides of leaves. Urediniospores were elliptical to obovate (17 to 28 × 11 to 23 μm) and finely verrucose. Telia were round, covered by the epidermis, slightly elevated, and brown to black. Teliospores were sessile and oblong to columnar (7 to 11 × 14 to 17 μm) with two or more vertical cell walls, and were smooth and brown. Urediniospore and teliospore morphology and dimensions were consistent with the description of Pucciniastrum vaccinii (G. Wint.) Jørst (syn. P. myrtilli Arth.) (1). A pathogenicity test was conducted with 18-month-old cv. Bluegold plants. Fully expanded leaves were sprayed, using a hand-held sprayer, with freshly collected urediniospores (1 mg of spores per ml of 0.05% water solution of Tween 20), covered with plastic bags, and placed in a growth chamber at 20°C for 48 h with 12 h of light per day. The plastic bags were then removed and the plants mantained in a greenhouse. After 10 days, orange rust pustules similar to the original symptoms developed on all plants. As the rust was not reported on ornamental Ericaceae in Argentina, and hemlock, the alternate host, is not present in the area, it is suggested that P. vaccinii is cycling on blueberry. This is the first report of P. vaccinii on blueberry in Argentina. Reference: (1) P. R. Bristow and A. W. Stretch. 1995. Pages 20-22 in: Compendium of Blueberry and Cranberry Diseases. F. L. Caruso and D. C. Ramsdell, eds. American Phytopathological Society, St. Paul, MN.
1997年3月，在阿根廷的越橘品种“蓝金”上发现了一种叶锈病。叶片病斑起初为褪绿斑点，随后扩展并发展成带有多个夏孢子堆的坏死斑。该病典型的橙色脓疱大多出现在叶片背面。夏孢子椭圆形至倒卵形（17至28×11至23微米），表面有细疣。冬孢子堆圆形，被表皮覆盖，稍隆起，褐色至黑色。冬孢子无柄，长圆形至柱状（7至11×14至17微米），具两个或更多垂直细胞壁，表面光滑，褐色。夏孢子和冬孢子的形态及尺寸与越橘柱锈菌（G. Wint.）Jørst（异名：P. myrtilli Arth.）的描述一致（1）。对18个月大的“蓝金”植株进行了致病性测试。使用手持喷雾器向完全展开的叶片喷洒新采集的夏孢子（每毫升含1毫克孢子的0.05%吐温20水溶液），用塑料袋覆盖，置于生长室中，温度为20°C，每天光照12小时，持续48小时。然后取下塑料袋，将植株置于温室中。10天后，所有植株上都出现了与最初症状相似的橙色锈脓疱。由于阿根廷尚未报道观赏杜鹃花科植物上有这种锈病，且该地区不存在转主寄主铁杉，因此推测越橘柱锈菌在蓝莓上循环侵染。这是阿根廷首次报道蓝莓上出现越橘柱锈菌。参考文献：（1）P. R. Bristow和A. W. Stretch。1995年。载于《蓝莓和蔓越莓病害汇编》，F. L. Caruso和D. C. Ramsdell编。美国植物病理学会，明尼苏达州圣保罗。
