First Report of Bronze Leaf Disease on Hybrid Poplar (Populus × canescens 'Tower') Caused by Apioplagiostoma populi in Manitoba, Canada

Plant Disease
P R Northover, M Desjardins

Abstract

Poplars (Populus alba × P. tremula (P. × canescens) (Aiton) Smith cv. Tower) are common ornamental and windbreak trees in Manitoba and across the Canadian prairie provinces because of their rapid growth and columnar growth habit. Bronze leaf disease symptoms have been reported on five poplar species (P. alba, P. canescens, P. grandidentata, P. tremula, and P. tremuloides) (2), and the disease presents a significant barrier to the development and continued use of poplars (1). Elimination of tower poplars would represent a significant loss to the Canadian horticultural industry, and the costs incurred in the replacement of existing windbreaks would be high. In August 2002, we observed symptoms of bronze leaf disease on approximately 20-year-old tower poplars, ranging in height from 8 to 12 m at a tree nursery and golf course near Carman, Manitoba (49°30'N, 98°0'W). The leaf laminae of affected plants were chocolate brown, and the petioles and veins were yellow to light green. In the nursery windbreak, 70 trees had foliar symptoms on 30 to 80% of the canopy. At the golf course, eight trees had foliar symptoms on approximately 5 to 20% of the canopy. No fruiting structures were visible on leaf or shoot tissue, and no staining of va...Continue Reading

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