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Yonghong Guo, Matthew Kramer and Margaret Pooler

problematic fungal diseases of the genus is cherry leaf spot (CLS) incited by Blumeriella jaapii (Rehm) Arx. (syn. Coccomyces hiemalis B.B. Higgins). CLS is a devastating pathogen on ornamental cherries, black cherries ( Prunus serotina Ehrh.), sweet

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Barrett R. Gruber, Libby R.R. Davies and Patricia S. McManus

The fungus Blumeriella jaapii [anamorph Phloeosporella padi (Lib.) Arx] incites cherry leaf spot (CLS), a serious disease of tart cherry ( Prunus cerasus ) in the Great Lakes region of North America ( Jones, 1995 ) and Europe ( Annesi et al

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Gregory A. Lang

High tunnel production systems typically use horticultural crops that are annually or biennially herbaceous, high in value, short in stature, and quick to produce. At best, tree fruits may fit only one of these criteria–high value. Sweet cherry (Prunus avium) may command high enough values in premium market niches to make high tunnel production strategies worth attempting. Furthermore, sweet cherry production can be a risky endeavor, even in optimal climates, due to the potentially devastating effects of preharvest rain that cause fruit cracking. Consequently, environmental modification by tunnels in regions like the Great Lakes provides a significant risk reduction. Additional potential benefits, such as protection from frosts, diseases, insects, wind scarring, etc., add further production value. Multi-bay high tunnels were constructed in 2005 at two Michigan State University experiment stations, over established and newly planted sweet cherry trees on dwarfing rootstocks, to study and optimize the effects of production environment modification on vegetative and reproductive growth, marketing season extension, and protection of cherries from diseases, insect pests, and/or physiological disorders. Results with tunnels thus far include premium fruit quality and high crop value; increased leaf size and terminal shoot growth; decreased radial trunk growth; decreased chemical pesticide inputs; decreased incidence of cherry leaf spot (Blumeriella jaapii) and bacterial canker (Pseudomonas syringae); increased incidence of powdery mildew (Podosphaera clandestina); inconclusive effects on brown rot (Monolinia fructicola); no or reduced infestation by plum curculio (Conotrachelus nenuphar) or cherry fruit fly (Rhagoletis cingulata); dramatically reduced japanese beetle (Popillia japonica) damage; and increased black cherry aphid (Myzus cerasi) and two-spotted spider mite (Tetranychus urticae) populations.

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Vladislav Ognjanov, Maja Miodragović, Goran Barać, Dejan Prvulović, Mirjana Ljubojević, Jovana Dulić and Dušica Dorić

Blumeriella jaapii (Rehm.) v. Arx. However, due to its high tolerance, it could serve as a potential donor for polygenic resistance ( Table 1 ). Availability Limited quantities of budwood are available for testing and commercial propagation from the Faculty

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Ksenija Gasic, John E. Preece and David Karp

; tolerant to brown rot and cherry leaf spot ( Blumeriella jaapii ), resistant to rain-induced cracking. Maddison. Dark red fruit, large, with firm flesh, early season. Origin: Malaga, WA by E. Gooch. Purportedly a whole-tree mutation of Bing; USPP 20