Diseases of Trees and Shrubs

Transcription

1 Diseases of Trees and Shrubs Color Diagnostic Guide Cynthia L. Ash, Martin A. Draper, H. Arthur Lamey and Dale 1. Gallenberg A collaborative effort of the University of Minnesota, North Dakota State University and South Dakota State University

2 1. Cedar-apple rust on red cedar Uuniper). 2. Cedar-apple rust on red cedar Uuniper). 3. Cedar-apple rust on apple. 4. Cedar-apple rust on apple. 5. Rust on hawthorn. 6. Rust onjuneberry. 7. Rust on buckthorn. 8. White pine blister rust on white pine. Authors: Cynthia L. Ash, Extension Plant Pathologist, University of Minnesota* Martin A. Draper, Plant-Pest Diagnostician, North Dakota State University H. Arthur Lamey, Extension Plant Pathologist, North Dakota State University Dale J. Gallenberg, Extension Plant Pathologist, South Dakota State University *publishing state MINNESOTA EXTENSION SERVICE UNIVERSITY OF MINNESOTA COOPERATIVE EXTENSION SERVICE 2

3 9. White pine blister rust on white pine. 10. Gall rust on Scots pine. 11. Cytospora canker on blue spruce. 12. Cytospora canker on blue spruce. 13. Rhizosphaera needlecast on blue spruce. 14. Rhizosphaera needlecast on blue spruce. 15. Sphaeropsis (Diplodia) blight on pine. Branch dieback. 16. Sphaeropsis blight on pine. Shoot blight. 17. Sphaeropsis blight on pine. Shoot blight. 18. Sphaeropsis blight on pine. Cones with fungal fruiting bodies Brown rot on wild plum.

4 20. Plum pockets on plum. 21. Black knot on Mayday tree. 22. Bacterial shothole on flowering plum. 23. Apple scab. 24. Apple scab. Close-up of lesions. 25. Apple scab on fruit. 26. Sooty blotch and fly speck on apple fruit. 27. Frog-eye leaf spot on apple leaf. 28. Black rot canker on apple limb Nectda canker on honey locust.

5 30. Tubercularia canker on Siberian elm. 31. Eutypella canker on Norway maple. 32. Smooth patch on oak. 34. Botryosphaeria shoot blight on sumac. 35. Laetiporus sulfureus, brown rot fungus on green ash. 33. Valsa canker on Prunus species. 36. Schizophyllum commune, common decay fungus. Follows sunscald on apple. 37. Walnut anthracnose on walnut. 38. Dogwood leaf spot. 5

6 39. Guignardia leaf spot on horse chestnut. 40. Rust on green ash. 43. Oak anthracnose. 41. Ash anthracnose on green ash. Early infection. 42. Ash anthracnose on green ash. Summer infection. 44. Maple anthracnose. Bottom of leaf. 45. Maple anthracnose. Top of leaf. 46. Tar spot on maple. 47. Elm black leaf spot on American elm. 6

7 48. Poplar shoot blight. 49. Septoria leaf spot on hybrid poplar. 50. Leaf rust on poplar. 51. Insolibasidium blight on honeysuckle. Bottom of leaves. 52. Insolibasidium blight on honeysuckle. Top of leaves. 53. Rose black leaf spot. 54. Rose black leaf spot. Close-up. 55. Rose rust. 7

8 56. Powdery mildew on rose. 57. Powdery mildew on nannyberry. 58. Powdery mildew on sumac. 59. Powdery mildew on lilac. 60. Bacterial blight on lilac. 61. Guignardia leaf spot on Boston ivy. 62. Fireblight on mountain ash. 63. Fireblight on apple. 8

9 64. Fireblight on cotoneaster. 65. Armillaria rhizomorphs. Associated with oak decline. 66. Phytophthora root rot on rhododendron. 68. Oak wilt. Fungal pressure pads. 67. Oak wilt. 69. Verticillium wilt on green ash. 70. VerticiJIium wilt. Foliar symptoms on green ash. 71. VerticiUium wilt. Vascular discoloration on maple. 72. Verticillium wilt. Vascular discoloration. 9

10 73. Dutch elm disease. 74. Dutch elm disease. 75. Dutch elm disease. 76. Dutch elm disease. Vascular streaking. 77. Bacterial wetwood on American elm. 78. Ash yellows witches' broom on green ash. 79. Rose mosaic virus complex. 81. Phenoxy herbicide damage on wild grape. 80. Phenoxy herbicide damage on lilac. 82. Phenoxy herbicide damage on maple. 10

11 83. Dicamba herbicide damage on birch. 84. Iron chlorosis on silver maple. 85. Iron chlorosis on pin oak. 86. Environmental leaf scorch on American elm. 87. Fall needle drop on red pine. 88. Girdling roots on maple. 89. Russeting on "Haralson" apple Winter injury to pine.

12 Disease/Problem Index Apple scab 23, 24, 25 Anthracnose 37, 41, 42, 43, 44, 45 Armillaria root rot 65 Ash anthracnose 41, 42 Ash rust 40 ' Ash yellows 78 Bacterial wetwood 77 Black knot 21 Black rot canker 28 Botryosphaeria shoot blight 34 Brown rot 19, 35 Buckthorn rust 7 Cedar-apple rust 1, 2, 3, 4 Cytospora canker 11, 12 Dicamba damage 83 Dogwood leaf spot 38 Dutch elm disease 73, 74, 75, 76 Elm black leaf spot 47 Environmental leaf scorch 86 Eutypella canker 31 Fall needle drop 87 Fireblight 62, 63, 64 Fly speck 26 Frog-eye leaf spot 27 Gall rust 10 Girdling roots 88 Guignardia leaf spot 39, 61 Hawthorn rust 5 Honeysuckle blight 51, 52 Iron chlorosis 84, 85 J uneberry rust 6 Laetiporus sulfureus 35 Lilac bacterial blight 60 Maple anthracnose 44, 45 Nectria canker 29 Oak anthracnose 43 Oak wilt 67, 68 Phenoxy herbicide damage 80, 81, 82 Phytophthora root rot 66 Plum pockets 20 Poplar shoot blight 48 Poplar leaf rust 50 Powdery mildew 56, 57, 58, 59 Rhizosphaera needlecast 13, 14 Rose black leaf spot 53, 54 Rose mosaic 79 Rose rust 55 Russeting 89 Rusts 1, 2, 3, 4, 5, 6, 7, 8, 9,10,40, 50,55 Septoria leaf spot 49 Shothole, bacterial 22 Schizophyllum commune 36 Smooth patch 32 Sooty blotch 26 Sphaeropsis (Diplodia) shoot blight 15, 16, 17, 18 Tar spot 46 Tubercularia canker 30 Valsa canker 33 Verticillium wilt 69, 70, 71, 72 Walnut anthracnose 37 White pine blister rust 8, 9 Winter injury 90 Host Index Apple 3, 4, 23, 24, 25, 26, 27, 28, 36, 63, 89 Ash, Green 35, 40, 41, 42, 69, 70, 78 Ash, Mountain 62 Birch 83 Buckthorn 7 Chestnut, Horse 39 Cotoneaster 64 Dogwood 38 Elm, American 47, 73, 74, 75, 76, 77,86 Elm, Siberian 30 Grape 81 Hawthorn 5 Honeylocust 29 Honeysuckle 51, 52 Ivy, Boston 61 Juneberry 6 Lilac 59, 60, 80 Maple 31, 44, 45, 46, 71, 82, 84, 88 Mayday Tree 21 Nannyberry 57 Oak 32, 43, 65, 67, 68, 85 Pine 8, 9, 10, 15,16,17, 18, 87, 90 Plum 19, 20, 22, 33 Poplar 48, 49, 50 Rose 53, 54, 55, 56, 79 Spruce 11, 12, 13, 14 Sumac 34, 58 Walnut 37 Photographs provided by faculty and staff at the University of Minnesota, North Dakota State University and South Dakota State University. FO-6426-S (in Minnesota) Reviewed 1996 PP-1082 (in North Dakota) ESS 37 (in South Dakota) Find more Minnesota Extension Service educational information at on the World Wide Web Copyright 1994 Minnesota Extension Service, University of Minnesota. All rights reserved. Send copyright permission inquiries to: Copyright Coordiantor, EDS, University of Minnesota, 405 Coffey Hall, St. Paul, MN , or to copyright@mes.umn.edu or fax to (612) In accordance with the Americans with Disabilities Act, this material is available in alternative formats upon request. Please contact your Minnesota county extension office or, outside of Minnesota, contact the Distribution Center at (612) The University, including the Minnesota Extension Service, is an equal opportunity educator and employer. Printed on recycled paper with."". Produced by the Educational Development System, Minnesota Extension Service. 10% postconsumerwaste. fj, 12