Sandra Jensen's Images
Title: Extension Support SpecialistOrganization: Cornell University
Unit: Plant Pathology and Plant-Microbe Biology
Country: United States
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Sandra Jensen has been the primary diagnostician at the Cornell Plant Disease Diagnostic Clinic since April of 2004 working with Karen Snover-Clift, Director of the Diagnostic Clinic and Associate Director of the NEPDN. She has a B.S. in Natural Resources from Cornell University, with a field of interest in forestry. Prior to joining the Diagnostic Clinic staff, Sandra worked as a Research Support Specialist for Professor George Hudler in the Department of Plant Pathology and Plant-Microbe Biology at Cornell University. In that capacity, she assisted with research and Extension projects involving pests of trees and shrubs with a focus on conifers. |
| 70 Images of 20 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 5492322 | Rhizosphaera needle cast | Rhizosphaera spp. | Fruiting bodies developing from stomates on a spruce needle |
| 5492323 | leaf spot of maize | Bipolaris zeicola | NCLS spores developing from a lesion on a leaf |
| 5492313 | rust | Pucciniastrum americanum | Rust pustules developing on yellow raspberry fruit |
| 5492318 | early blight | Alternaria solani | External and internal view of Early Blight lesions; note symptoms within this tuber are shallow. |
| 5492319 | early blight | Alternaria solani | Large lesion on tuber infected with Early Blight pathogen Alternaria solani |
| 5492320 | early blight | Alternaria solani | Shallow symptoms in potato tuber flesh where skin cut away from lesion of tuber infected with Alternaria solani |
| 5492303 | early blight | Alternaria solani | Four Alternaria solani isolates growing on acidified potato dextrose agar (APDA) and showing colony variation and yellow pigmentation of the agar. |
| 5492304 | mycelial neck rot | Botrytis tulipae | Rough yellow lesions on surface of an infected bulb |
| 5492336 | Rhizosphaera needle cast | Rhizosphaera spp. | Rhizosphaera pycnidia on spruce |
| 5492338 | Rhizosphaera needle cast | Rhizosphaera spp. | Close-up view of Rhizosphaera fruiting bodies developing from stomates on a spruce needle. White caps of wax and colorless masses of spores visible on top of pycnidia. |
| 5492305 | mycelial neck rot | Botrytis tulipae | Dark fungal sclerotia on roots of infected (potted) plants |
| 5492306 | mycelial neck rot | Botrytis tulipae | Closer view of dark fungal sclerotia on roots of infected (potted) plants. |
| 5484085 | brown spot needle blight of pine | Mycosphaerella dearnessii | Fruiting bodies on Easter white pine needle. |
| 5484086 | brown spot needle blight of pine | Mycosphaerella dearnessii | Olive brown spores. |
| 5484087 | rust | Pucciniastrum americanum | A rust pustule on raspberry fruit with spores. |
| 5484090 | late blight | Phytophthora infestans | Late blight symptom, leaf spot, view of upper and lower leaf surfaces. |
| 5484091 | late blight | Phytophthora infestans | late blight symptom on green fruit surface |
| 5484092 | late blight | Phytophthora infestans | Late blight internal symptom in green fruit |
| 5492339 | Stigmina leaf spot | Stigmina lautii | dark fruiting bodies developing from stomates on a blue spruce needle |
| 5492337 | Rhizosphaera needle cast | Rhizosphaera spp. | Pycnidia of a Rhizosphaera sp. on a spruce needle. |
| 5492321 | late blight | Phytophthora infestans | Cut surface exposing internal symptoms of tuber infected with Phytophthora infestans |
| 5458673 | Alternaria black molds / stem cankers | Alternaria spp. | Alternaria leaf spot. |
| 5458674 | Alternaria black molds / stem cankers | Alternaria spp. | Alternaria leaf spot. |
| 5461615 | puccinia rusts | Puccinia spp. | rust on buckthorn |
| 5461613 | anthracnose | Colletotrichum spp. | hyphopodia |
| 5458656 | spruce needle rust | Chrysomyxa weirii | Individual Chrysomyxa weirii rust pustule swelling and splitting open on a blue spruce needle. |
| 5457957 | late blight | Phytophthora infestans | Sporangia of Phytophthora infestans. |
| 5457968 | late blight | Phytophthora infestans | Sporangia of Phytophthora infestans. |
| 5458655 | spruce needle rust | Chrysomyxa weirii | Chrysomyxa weirii spores |
| 5457969 | maple cankers | Stegonsporium spp. | Dark fruiting bodies emerging from blighted maple twig |
| 5458657 | spruce needle rust | Chrysomyxa weirii | Immature Chrysomyxa weirii rust pustules on blue spruce needles. Note slight swellings where fruiting bodies are developing within yellow-orange spots on needles. |
| 5458658 | spruce needle rust | Chrysomyxa weirii | Immature Chrysomyxa weirii rust pustules on blue spruce needles. Note slight swellings where fruiting bodies are developing within yellow-orange spots on needles. |
| 5458659 | spruce needle rust | Chrysomyxa weirii | Chrysomyxa weirii rust pustules on blue spruce needles showing the release of masses of infectious spores. |
| 5458665 | Ploioderma needle cast of pine | Ploioderma lethale | Eight mature ascospores |
| 5457972 | maple cankers | Stegonsporium spp. | dark spores |
| 5457973 | maple cankers | Stegonsporium spp. | fruiting body with mature spores |
| 5458688 | Stigmina leaf spot | Stigmina lautii | |
| 5458686 | downy mildew | Peronospora sparsa | Sporangia. |
| 5458681 | Impatiens Necrotic Spot Virus | Tospovirus INSV | Foliar symptoms. |
| 5458682 | orange rust | Arthuriomyces peckianus | Black raspberry infected with the Orange Rust fungus Arthuriomyces peckianus and exhibiting numerous bright orange pustules developing on the undersides of leaves. |
| 5458685 | downy mildew | Peronospora sparsa | Sporangia. |
| 5458088 | mycelial neck rot | Botrytis tulipae | Dark fungal sclerotia developing on roots might be mistaken for clumps of media. |
| 5458715 | downy mildew | Plasmopara viburni | Lesions on the underside of a leaf. Note how many individual lesions appear angular as lesions develop between small leaf veins. |
| 5458716 | downy mildew | Plasmopara viburni | Close view of adjacent lesions on the underside of a leaf. Sparser white growth is the least mature. |
| 5458712 | downy mildew | Plasmopara viburni | Close-up view of lesions on the underside of a leaf. |
| 5458713 | downy mildew | Plasmopara viburni | Fruiting bodies developing along a vein on the underside of the leaf. |
| 5458714 | downy mildew | Plasmopara viburni | Lesions on the upper surface of a leaf. |
| 5458711 | downy mildew | Plasmopara viburni | Lesions on the underside of a leaf. |
| 5458079 | basil downy mildew | Peronospora belbahrii | sporangia |
| 5458086 | basil downy mildew | Peronospora belbahrii | Masses of purplish sporangia on the undersurface of a leaf. |
| 5458087 | basil downy mildew | Peronospora belbahrii | Masses of purplish sporangia on the undersurface of a leaf. |
| 5458376 | rust | Puccinia pelargonii-zonalis | Lesions on underside of leaf, close view |
| 5458377 | rust | Puccinia pelargonii-zonalis | a single teliospore |
| 5458378 | rust | Puccinia pelargonii-zonalis | Urediniospores |
| 5458379 | rust | Puccinia pelargonii-zonalis | Close view of one lesion on the underside of an infected leaf. Note the pustules breaking open in the center where spores are being liberated. |
| 5458380 | rust | Puccinia pelargonii-zonalis | Urediniospores and Teliospores. |
| 5458381 | rust | Puccinia pelargonii-zonalis | Numerous urediniospores with a few two celled teliospores also visible. |
| 5458091 | basil downy mildew | Peronospora belbahrii | Heavy spore production on the undersurface of the leaf may look like dust or dirt on the tissue. |
| 5458092 | basil downy mildew | Peronospora belbahrii | A closer view of a lesion with dense sporulation that looks like a grayish-purple mold on the leaf. |
| 5458383 | rust | Puccinia pelargonii-zonalis | Numerous foliar lesions as viewed on underside of infected leaf. |
| 5458384 | rust | Puccinia pelargonii-zonalis | Underside of severely infected geranium leaf. Note the lesion on the petiole. |
| 5458385 | rust | Puccinia pelargonii-zonalis | Upper surface of severely infected geranium leaf. Note the lesion on the petiole. |
| 5458386 | rust | Puccinia pelargonii-zonalis | A single lesion on the underside of an infected leaf. This lesion looks like a happy face. |
| 5457975 | anthracnose | Colletotrichum spp. | Colletotrichum acervuli with setae developing on butternut squash. |
| 5458080 | basil downy mildew | Peronospora belbahrii | Sporangia |
| 5458090 | mycelial neck rot | Botrytis tulipae | general view of symptomatic plant showing decay of bulb |
| 5458089 | mycelial neck rot | Botrytis tulipae | Symptoms of Botrytis tulipae, Tulip Fire, on leaves and petioles. |
| 5458101 | mycelial neck rot | Botrytis tulipae | Infected bulb exhibiting rot with dark sclerotia developing on surface. |
| 5458103 | mycelial neck rot | Botrytis tulipae | Black sclerotia and gray mycelium and spores developing on roots of infected plants. |
| 5458105 | mycelial neck rot | Botrytis tulipae | Dark sclerotia developing on an infected bulb. |
