John W. Schwandt's Images
Title: Plant PathologistOrganization: USDA Forest Service
Unit: Forest Health Protection - Coeur d’Alene Field Office
Country: United States
| 31 Images of 20 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 4215071 | spruce broom rust | Chrysomyxa arctostaphyli | on spruce |
| 1241567 | Rhabdocline needlecasts | Rhabdocline spp. | Rhabdocline apothecia are released when flaps of leaf epidermis fold back on either side of the midrib. |
| 1241566 | Rhabdocline needlecasts | Rhabdocline spp. | Rhabdocline apothecia are released when flaps of leaf epidermis fold back on either side of the midrib. |
| 1241616 | pine needle cast | Lophodermium nitens | Lophodermium nitens has caused severe defoliation in this western white pine. |
| 1241588 | needle blight of larch | Meria laricis | Larch needle cast causes yellow spots which become red-brown, begins infecting emerging needles in the spring, and can continue to reinfect as long as rainfall creates suitable conditions. |
| 1241565 | Rhabdocline needlecasts | Rhabdocline spp. | Red spots and transverse banding on infected needles. |
| 1241666 | root diseases and rots | A cluster of young Douglas-fir and grand fir have been killed by root disease near this old stump. | |
| 1241717 | white pine blister rust | Cronartium ribicola | Wetting branch cankers can make it easier to see the discoloration from a canker. |
| 1241724 | western gall rust | Endocronartium harknessii | Branch flagging in crown caused by western gall rust. |
| 1241662 | root diseases and rots | A stress cone crop produced on a tree with thinning foliage and shortened terminal growth is an indication of root disease. | |
| 1241654 | root diseases and rots | Root disease is often easily recognized from afar. Changes in tree density and clusters of young trees or brush assocaiated with tree mortality are good indicators of root disease. | |
| 1241718 | white pine blister rust | Cronartium ribicola | Branch flagging occurs after the canker has girdled the branch. |
| 1241671 | Armillaria root rot | Armillaria solidipes | Mycelium fans of Armillaria are thick and leathery. The cambium often develops fan-shaped ridges which are discernible long after the fungus has died. |
| 1241672 | Armillaria root rot | Armillaria solidipes | Mushrooms of Armillaria can be produced in abundance, but are not reliably present. |
| 1241674 | annosum root disease | Heterobasidion annosum | An useful sign of annosus root disease is an irregular pattern of staining in root and butt heartwood. In firs, the stain varies from dull gray, to reddish-purple. |
| 1241678 | annosum root disease | Heterobasidion annosum | Annosus root disease often is diagnosed by looking in hollows of nearby stumps where the conks are found. The lower surface has tiny pores and is cream colored. |
| 1241679 | annosum root disease | Heterobasidion annosum | Advanced decay has irregular white pockets and black fleck. It is soemwhat laminate at the beginning but eventually becomes stringy and spongy. |
| 1241685 | laminated root disease | Phellinus weirii | Laminated root rot separates easily at the annual rings and is pitted with tiny holes. Cinnamon brown mycelium and tiny hairlike hyphae are often found in the decay. |
| 1241715 | white pine blister rust | Cronartium ribicola | Rust sporulating on the bole of an infected tree. |
| 1241542 | cedar brown pocket rot | Postia sericeomollis | Cedar brown pocket rot occurs in isolated large pockets of brown cubical decay. Seen in cross section. |
| 1241571 | Douglas-fir needle midge | Contarinia pseudotsugae | Needles infested with Douglas-fir needle midge have swellings or galls which are discolored yellow. |
| 1241545 | red-belted fungus | Fomitopsis pinicola | Red belt fungus conks has a distinctive red band along the perimeter when mature and fresh but are often seen in the immature stage. |
| 1241546 | heart rot | Laricifomes officinalis | Typical quinine conk fruiting high on the stem of a tree. |
| 1241547 | heart rot | Laricifomes officinalis | Close-up of conk showing the pore layer on the underside. |
| 1241549 | indian paint fungus | Echinodontium tinctorium | Indian paint fungus decay is yellow to brown and slightly stringy in the early stages. Concentric rings of lighter and darker heartwood are seen in cross section. In late stages the decay is somewhat laminate and distinctly stringy. |
| 1241494 | American dwarf mistletoe | Arceuthobium americanum | |
| 1241499 | Douglas-fir dwarf mistletoe | Arceuthobium douglasii | Male |
| 1241505 | Elytroderma needle cast of pine | Elytroderma deformans | Cambium of infected branches has small pockets of dark resin. |
| 1241507 | Elytroderma needle cast of pine | Elytroderma deformans | Fruiting bodies are black lines near the base of needles. |
| 1241510 | Diplodia blight | Sphaeropsis sapinea | Pycnidia on twig. |
| 1241532 | veiled polypore | Cryptoporus volvatus | Conk cut away to show pore layer and air space inside. |
