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. |
| 30 Images of 10 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 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 |
| 5492304 | mycelial neck rot | Botrytis tulipae | Rough yellow lesions on surface of an infected bulb |
| 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 |
| 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 |
| 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. |
| 5458681 | Impatiens Necrotic Spot Virus | Tospovirus INSV | Foliar symptoms. |
| 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. |
| 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. |
| 5458376 | rust | Puccinia pelargonii-zonalis | Lesions on underside of leaf, close view |
| 5458382 | rust | Puccinia pelargonii-zonalis | Foliar lesions as viewed on underside of infected leaf. |
| 5458091 | basil downy mildew | Peronospora belbahrii | Heavy spore production on the undersurface of the leaf may look like dust or dirt on the tissue. |
| 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. |
| 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. |
| 5458104 | mycelial neck rot | Botrytis tulipae | Dieback of leaf tips and neck rot, with dark fungal sclerotia present on rotted tissue of the bulb. |
