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Stem and leaf spot infections caused by septoria musiva and septoria populicola on poplar seedlings

, : Stem and leaf spot infections caused by septoria musiva and septoria populicola on poplar seedlings. Phytoprotection 59(1): 54-50

S. musiva and S. populicola were isolated, respectively, from overwintered leaves of hybrid poplar and balsam poplar, Populus balsamifera in Manitoba [Canada] as perithecia of Mycosphaerella populorum and M. populicola. Isolates were sporulated on barley meal in flasks and inocula were prepared by suspending conidia in water. Seedlings of P. balsamifera grown from 90 trees in 18 localities in 6 source areas in Manitoba were inoculated in the greenhouse. S. musiva caused the highest percentage of canker and leaf spot of balsam poplar seedlings from all areas. Seedlings from 2/3 of the localities did not develop S. populicola cankers, and from 2 localities no leaf spots. S. musiva also caused canker and leaf spot on 1 seed source sample (15 trees) of eastern cottonwood, P. deltoides, a differential host of S. populicola, which caused occasional leaf spot but no canker. Infected plants responded with a canker that is delimited laterally by phloem fibers. Twelve selections of seedlings were resistant to Septoria canker caused by S. populicola and one to S. musiva. Although S. musiva generally had a high inoculum potential, the fungus did not produce as many spores as S. populicola in infected balsam poplar seedlings. Monitoring leaf infections and the change of fungus activity from colonization to sporulation may help to time control measures under nursery operations.


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