Susan K. Hagle's Images
Title: Plant PathologistOrganization: USDA Forest Service
Unit: Forest Health Protection
Country: United States
| 56 Images of 30 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 1241503 | fir broom rust | Melampsorella caryophyllacearum | Fir broom rust stimulates yellow-tinged witches brooms in fir branches. |
| 1241646 | herbicides (general) | Growth distortion of common mullein from hormone type herbicide. | |
| 1241636 | drought | Under extreme drought conditions, even mature trees can be severely damaged. This tree had shed older needles first but as the drought continued, the terminal and branch tips have died back. Crown thinning due to drought is typically nonuniform as seen here. | |
| 1241644 | herbicides (general) | A mixture of herbicides was used beneath this pine producing both recurved needles and foliage loss. | |
| 1241592 | larch casebearer | Coleophora laricella | The needle tips turn brown due to feeding. |
| 1241526 | Diplodia blight | Sphaeropsis sapinea | |
| 1241612 | lodgepole pine needle cast | Lophodermella concolor | Lophodermella concolor turns needles bright red-brown just before bud break in the spring. |
| 1241613 | lodgepole pine needle cast | Lophodermella concolor | Lophodermella concolor turns needles bright red-brown just before bud break in the spring. |
| 1241617 | pine needle cast | Lophodermium nitens | The wilted needles are red-brown with dark mottling at first, then gray. |
| 1241669 | Armillaria root rot | Armillaria solidipes | Resinosus on a young, thin-barked Douglas-fir is often the first sign of infection. |
| 1241610 | Dothistroma needle blight | Mycosphaerella pini | A light infection. |
| 1241637 | drought | This sapling exhibits symptoms of chronic drought; thin crown, short needles, and short terminal growth. | |
| 1241754 | deer | Repeated browsing has caused multiple stems to be produced. | |
| 1241647 | chemicals | Douglas-fir damaged several miles downwind from release site of chloring gas. Outer foliage was killed and shed within two weeks of exposure. | |
| 1241758 | fire | This old fire scar has intact bark covering most of the injury. The cambium was killed by a column of heat without burning the bark. Decay extends into the heartwood behind the injury. Pulling away loose bark revealed a single callous ridge typical of a non-canker stem injury. | |
| 1241713 | white pine blister rust | Cronartium ribicola | Stem cankers eventually girdle and kill trees. |
| 1241759 | fire | This old fire scar has intact bark covering most of the injury. The cambium was killed by a column of heat without burning the bark. Decay extends into the heartwood behind the injury. Pulling away loose bark revealed a single callous ridge typical of a non-canker stem injury. | |
| 1241648 | chemicals | Trees of several species died after calcium chloride dust abatement was applied to the road. | |
| 1241583 | Delphinella shoot blight | Delphinella abietis | Delphinella abietis infects and kills tender shoots during expansion in early summer. |
| 1241661 | root diseases and rots | Crown symptoms of root disease (right) are most evident when compared to a healthy crown (left). | |
| 1241735 | sequoia pitch moth | Synanthedon sequoiae | Pine with unusually heavy damage. |
| 1241753 | deer | Antler rubbing damage with shedded bark and callous ridges. | |
| 1241649 | chemicals | Foliage symptoms of calcium chloride injury. Symptoms developed in the spring following a late summer application. | |
| 1241645 | herbicides (general) | Herbicide injury. | |
| 1241721 | western gall rust | Endocronartium harknessii | Branch gall as they normally appear. |
| 1241723 | western gall rust | Endocronartium harknessii | Stem ("hip") canker caused by western gall rust. |
| 1241756 | sunscald | Sunscald is seen on the south side of thin-barked trees. | |
| 1241757 | mechanical | Fresh mechanical wound with resin. The bark was torn away and the wood gouged during logging. Frayed wood and bark are evidnece of mechanical injury. | |
| 1241652 | root diseases and rots | Typical root disease patch (or pocket)with dead and symptomatic trees, especially at the margins, and younger trees in the center of the patch. | |
| 1241656 | root diseases and rots | Root disease mortality in young stands often goes undetected before about 20 years of age. | |
| 1241658 | root diseases and rots | Root disease mortality in young stands often goes undetected before about 20 years of age. | |
| 1241660 | root diseases and rots | Root disease mortality in young stands often goes undetected before about 20 years of age. From the scattered or small groups of mortality, the disease generally progresses to large mosaics of poorly stocked forest by age 80-100. | |
| 1241686 | laminated root disease | Phellinus weirii | Decay from laminated root rot has distinctive round pits about pinhead-size. |
| 1241687 | Schweinitzii root and butt disease | Phaeolus schweinitzii | Brown cubical decay in the butt end of the first log is the most common indication. |
| 1241691 | Schweinitzii root and butt disease | Phaeolus schweinitzii | Phaeolus schweinitzii conks are yellow-green when fresh but age rapidly to a yellow-brown and finally dark brown color. They have a velvety cap, a short stem (stipe) and a pored green to brown lower surface. |
| 1241692 | Schweinitzii root and butt disease | Phaeolus schweinitzii | Phaeolus schweinitzii conks are yellow-green when fresh but age rapidly to a yellow-brown and finally dark brown color. They have a velvety cap, a short stem (stipe) and a pored green to brown lower surface. |
| 1241693 | Schweinitzii root and butt disease | Phaeolus schweinitzii | Small diameter roots sometimes have a dark red resinous heart when infected. |
| 1241694 | Schweinitzii root and butt disease | Phaeolus schweinitzii | Roots of windthrown trees with schweinitzii root rot commonly are stubbed and have gall-like swellings. |
| 1241577 | fir needle cast | Isthmiella quadrispora | Yellow discolored needles of subalpine fir with Isthmiella quadrispora (needle cast) infection and secondary infection by Lophomerum autumnale (Darker) magasi. |
| 1241578 | common snow mold | Phacidium infestans | Snow blight kills needles under snow. Small black dots of fruiting bodies are in two lines on either side of the midrib on the underside of needles. |
| 1241579 | Rasutoria fungus | Rasutoria abietis | Black mildew is only weakly parasitic, growing mostly superficially in round colonies. The mycelium enters needles through stomata to absorb nutrients from the host. Needle senescence may be hastened by heavy growth of black mold. |
| 1241541 | cedar brown pocket rot | Postia sericeomollis | Cedar brown pocket rot occurs in isolated large pockets of brown cubical decay. Seen in longitudinal. |
| 1241716 | white pine blister rust | Cronartium ribicola | Basal canker. |
| 1241568 | Swiss needle cast | Phaeocryptopus gaeumannii | Pseudothecia on underside of needles ranging from lightly infected (left) to heavily infected (right). |
| 1241569 | Swiss needle cast | Phaeocryptopus gaeumannii | Close-up of pseudothecia on underside of needle. |
| 1241570 | Swiss needle cast | Phaeocryptopus gaeumannii | Micrograph of needle cross section with pseudothecia emerging from stomata on underside. |
| 1241543 | red-belted fungus | Fomitopsis pinicola | Red belt fungus conks has a distinctive red band along the perimeter when mature and fresh. |
| 1241544 | red-belted fungus | Fomitopsis pinicola | Red belt fungus conks has a distinctive red band along the perimeter when mature and fresh. |
| 1241508 | Diplodia blight | Sphaeropsis sapinea | Severely infected tree. |
| 1241509 | Diplodia blight | Sphaeropsis sapinea | Close-up of infected twig. |
| 1241528 | Schweinitzii root and butt disease | Phaeolus schweinitzii | Conk of the velvet top fungus the cause of Schweinitzii Root Rot. |
| 1241531 | veiled polypore | Cryptoporus volvatus | Close-up of Pouch fungus fruits through bark beetle emergence holes on boles. |
| 1241534 | red heart of pine | Phellinus pini | Pini conks are woody and shelving or nearly resupinate with a tan to cinnamon colored pore layer. |
| 1241540 | laminated root disease | Phellinus weirii | Examined longitudinally, wood decayed by Phellinus weirii separates easily into thin concentric sheets. |
| 2251089 | clearcut | in Montana | |
| 2251092 | Schweinitzii root and butt disease | Phaeolus schweinitzii | Brown decay in center of approx. 4 cm diameter root. Very common and slow-acting disease of conifers. |
