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. |
| 66 Images of 22 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 5492330 | Ploioderma fungi | Ploioderma spp. | Appearance of immature fruiting bodies as observed on needles in spring |
| 5492332 | Ploioderma fungi | Ploioderma spp. | Immature Ploioderma fruiting bodies appearing as thin black lines on the needle surface; as fruiting bodies mature and swell, the needle epidermis will split along these lines. |
| 5457956 | Camarosporium fungi | Camarosporium spp. | Spores |
| 5492322 | Rhizosphaera needle cast | Rhizosphaera spp. | Fruiting bodies developing from stomates on a spruce needle |
| 5492324 | oak wilt | Ceratocystis fagacearum | Dark streaking on wood of oak branch |
| 5492325 | oak wilt | Ceratocystis fagacearum | Endoconidia and conidia of Ceratocystis fagacearum from culture |
| 5492326 | oak wilt | Ceratocystis fagacearum | Appearance of Ceratocystis fagacearum grown on acidified potato dextrose agar (APDA) at 18 degrees C. (at 3-4 weeks) |
| 5492314 | Cytospora cankers | Cytospora spp. | Cytospora/spruce canker: cross section of Cytospora pycnidial stroma |
| 5492315 | Cytospora cankers | Cytospora spp. | The tip of a pycnidial stroma just visible breaking through the bark on a spruce branch with Cytospora canker |
| 5492317 | Cytospora cankers | Cytospora spp. | yellow tendrils of conidia oozing from pycnidial stromata of a Cytospora sp. developing in an infected spruce branch |
| 5492312 | Cytospora cankers | Cytospora spp. | Pycnidial stromata of Cytospora sp. showing yellowish spores oozing from fruiting bodies after bark cut away and tissue moistened. |
| 5492309 | Cytospora cankers | Cytospora spp. | Tendril of spores (conidia) oozing from pycnidial stroma of a Cytospora sp. |
| 5492333 | pine wilt nematode | Bursaphelenchus xylophilus | Anterior half of a pine wood (pine wilt) nematode |
| 5492335 | pine wilt nematode | Bursaphelenchus xylophilus | view of head region of an individual Bursaphelenchus nematode |
| 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. |
| 5492340 | white pine weevil | Pissodes strobi | an adult white pine weevil collected from spruce |
| 5492342 | white pine weevil | Pissodes strobi | White pine weevil adult on a spruce branch |
| 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. |
| 5492307 | Cytospora cankers | Cytospora spp. | Pycnidial stromata of Cytospora exposed in bark of a spruce branch |
| 5492308 | Cytospora cankers | Cytospora spp. | Cross section through a pycnidial stroma in bark of a blue spruce branch |
| 5492331 | Ploioderma fungi | Ploioderma spp. | Appearance of immature fruiting bodies as observed on needles in spring |
| 5492311 | Cytospora cankers | Cytospora spp. | Pycnidial stromata of Cytospora sp. showing yellowish spores oozing from fruiting bodies after bark was cut away and tissue moistened. |
| 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. |
| 5492334 | pine wilt nematode | Bursaphelenchus xylophilus | Anterior region of a pine wood (pine wilt) nematode showing metacorpus |
| 5492316 | Cytospora cankers | Cytospora spp. | Close up of a pycnidial stroma of Cytospora in cross section |
| 5492310 | Cytospora cankers | Cytospora spp. | Pycnidial stromata exposed when bark cut away from spruce canker |
| 5461621 | spruce bud scale | Physokermes piceae | spruce bud scale close view |
| 5458679 | Dermea | Dermea sp. | conidia |
| 5457964 | Dothiostroma fungus | Dothistroma spp. | Conidia |
| 5458084 | Japanese apple rust | Gymnosporangium yamadae | |
| 5461619 | forest tent caterpillar | Malacosoma disstria | single young larva |
| 5461614 | forest tent caterpillar | Malacosoma disstria | injury to dogwood by forest tent caterpillars |
| 5458656 | spruce needle rust | Chrysomyxa weirii | Individual Chrysomyxa weirii rust pustule swelling and splitting open on a blue spruce needle. |
| 5458707 | Japanese apple rust | Gymnosporangium yamadae | Aeciospores and peridial cells. |
| 5458708 | Japanese apple rust | Gymnosporangium yamadae | Close view of aeciospores |
| 5458709 | Japanese apple rust | Gymnosporangium yamadae | Aeciospores and peridial cells |
| 5458710 | Japanese apple rust | Gymnosporangium yamadae | Teliospores from gall on juniper |
| 5458680 | Japanese apple rust | Gymnosporangium yamadae | Gall on juniper. |
| 5458655 | spruce needle rust | Chrysomyxa weirii | Chrysomyxa weirii spores |
| 5458677 | black vine weevil | Otiorhynchus sulcatus | Two adult black vine weevils. Look closer to see white nymph in lower right corner. |
| 5457969 | maple cankers | Stegonsporium spp. | Dark fruiting bodies emerging from blighted maple twig |
| 5458705 | Japanese apple rust | Gymnosporangium yamadae | Close-up of surface of gall on Juniper. |
| 5458706 | Japanese apple rust | Gymnosporangium yamadae | Close view of the spore producing surface of a gall. |
| 5457974 | Inonotus cankers | Inonotus spp. | View through fungal pores showing setae. Image is a composite of several photos layered together. |
| 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 |
| 5458667 | bacterial leaf scorch | Xylella fastidiosa | Bacterial Leaf Scorch symptoms on maple leaves. |
| 5458688 | Stigmina leaf spot | Stigmina lautii | |
| 5458678 | Dutch elm disease (novi-ulmi) | Ophiostoma novo-ulmi | Synnemata |
| 5458668 | bacterial leaf scorch | Xylella fastidiosa | Bacterial Leaf Scorch and Black Spot on an elm leaf. |
| 5458669 | bacterial leaf scorch | Xylella fastidiosa | Bacterial Leaf Scorch symptoms on elm. |
| 5458670 | bacterial leaf scorch | Xylella fastidiosa | Symptoms of Bacterial Leaf Scorch on maple leaves. Note distinct bands between green and brown foliage on some leaves. |
| 5458671 | bacterial leaf scorch | Xylella fastidiosa | Bacterial Leaf Scorch symptoms on maple leaves. |
| 5457979 | Inonotus cankers | Inonotus spp. | Fruiting body removed from the base of a living tree |
| 5458081 | Japanese apple rust | Gymnosporangium yamadae | Aecia on the underside of a crabapple leaf. |
| 5457977 | balsam twig aphid | Mindarus abietinus | two balsam twig aphid eggs on bark |
| 5457955 | bacterial leaf scorch | Xylella fastidiosa | Bacterial leaf scorch on Ulmus spp. |
| 5457976 | balsam twig aphid | Mindarus abietinus | A single dark egg covered with thin rods of light colored wax which gives the egg a silvery appearance. |
| 5457963 | Dutch elm disease (novi-ulmi) | Ophiostoma novo-ulmi | Synemmata developing within a wound on an elm branch. |
