| 1574177 |
mosaic viruses (general) |
|
Zucchini Yellow Mosaic Virus and Watermelon Mosaic Virus on slicing cucumber. November 1997
|
| 1574135 |
white spot |
Pseudocercosporella capsellae |
Teleomorph = Mycosphaerella capsellae. |
| 1574117 |
powdery mildew |
Podosphaera xanthii |
Micrograph of conidia and conidiophores. October 1997 |
| 1574115 |
powdery mildew |
Podosphaera xanthii |
Micrograph of conidia and conidiophores. October 1997 |
| 1574116 |
powdery mildew |
Podosphaera xanthii |
Micrograph of single conidiophore. October 1997 |
| 1573950 |
edema |
|
Edema in young plant (see leaf in lower left). September 1997 |
| 1573951 |
edema |
|
Severe edema on young cabbage plant. September 1997 |
| 1573949 |
edema |
|
Close-up of 2 leaves. September 1997 |
| 1573687 |
downy mildew |
Pseudoperonospora cubensis |
Close up of diseased leaf edge. Cultivar = Athena. August 1997 |
| 1573686 |
downy mildew |
Pseudoperonospora cubensis |
Close up of diseased leaf on black background. Cultivar = Athena. August 1997 |
| 1573676 |
mosaic viruses (general) |
|
Four squash fruit from the same diseased plant showing virus symptom expression at each stage of fruit development; see leaf photo for foliar symptoms. Watermelon Mosaic Virus and Zucchini Yellow Mosaic Virus were confirmed using AgDia cucurbit screen. August 1997 |
| 1573675 |
mosaic viruses (general) |
|
Close up of 2 diseased squash fruit. See leaves in image 1573670 (same plant). Watermelon Mosaic Virus and Zucchini Yellow Mosaic Virus were confirmed using AgDia cucurbit screen. August 1997 |
| 1573673 |
mosaic viruses (general) |
|
Close up of diseased squash leaf & fruit from the same plant. Watermelon Mosaic Virus and Zucchini Yellow Mosaic Virus confirmed by Agdia cucurbit screen. August 1997 |
| 1573671 |
mosaic viruses (general) |
|
Close up of diseased squash leaf & fruit on black background. Watermelon Mosaic Virus and Zucchini Yellow Mosaic Virus were confirmed using AgDia cucurbit screen. August 1997 |
| 1573670 |
mosaic viruses (general) |
|
Close up of diseased squash leaf on black background; see fruit on #1572675 (same plant). Watermelon Mosaic Virus and Zucchini Yellow Mosaic Virus confirmed using AgDia cucurbit screen. August 1997 |
| 1573669 |
mosaic viruses (general) |
|
Severe shoestringing on 2 squash leaves. Watermelon Mosaic Virus and Zucchini Yellow Mosaic Virus confirmed using Agdia cucurbit screen. August 1997 |
| 1573668 |
mosaic viruses (general) |
|
Close up of shoestringing symptom on squash leaf. Watermelon Mosaic Virus and Zucchini Yellow Mosaic Virus confirmed by Agdia cucurbit virus screen. August 1997 |
| 1573667 |
mosaic viruses (general) |
|
Close up of shoestringing symptom on squash leaf. Watermelon Mosaic Virus and Zucchini Yellow Mosaic Virus confirmed by Agdia cucurbit virus screen. August 1997 |
| 1573517 |
anthracnose |
Colletotrichum orbiculare |
Diseased cucumber leaf tissue showing dark, hair-like structures (setae) of Colletotrichum orbiculare as seen at low magnification (30-50X). July 1997 |
| 1573515 |
anthracnose |
Colletotrichum orbiculare |
Diseased cucumber leaf tissue showing dark, hair-like structures (setae) of Colletotrichum orbiculare as seen at low magnification (30-50X). July 1997 |
| 1573516 |
anthracnose |
Colletotrichum orbiculare |
Diseased cucumber leaf tissue showing dark, hair-like structures (setae) of Colletotrichum orbiculare as seen at low magnification (30-50X). July 1997 |
| 1573514 |
anthracnose |
Colletotrichum orbiculare |
Micrograph of diseased cucumber leaf tissue showing dark, hair-like structures (setae) of Colletotrichum orbiculare as seen at high magnification (100X). Two conidia can been seen near a leaf trichome. July 1997 |
| 1573513 |
anthracnose |
Colletotrichum orbiculare |
Micrograph of diseased cucumber leaf tissue showing dark, hair-like structures (setae) of Colletotrichum orbiculare as seen at high magnification (200X). Two conidia can been seen near a leaf trichome. July 1997 |
| 1573511 |
anthracnose |
Colletotrichum orbiculare |
Dark, hair-like structures are setae of Colletotrichum orbiculare as seen at high magnification (100X), July 1997 |
| 1573507 |
anthracnose |
Colletotrichum orbiculare |
Dark, hair-like structures are setae of Colletotrichum orbiculare as seen at low magnification (30-50X), July 1997 |
| 1573500 |
bean anthracnose |
Colletotrichum lindemuthianum |
July 1997 |
| 1573501 |
bean anthracnose |
Colletotrichum lindemuthianum |
July 1997 |
| 1573424 |
brown spot |
Alternaria alternata |
Secondary organisms will colonize injured tissue following chilling injury. July 1997 |
| 1573510 |
anthracnose |
Colletotrichum orbiculare |
Conidia of Colletotrichum orbiculare as seen under a compound microscope. July 1997 |
| 1573508 |
anthracnose |
Colletotrichum orbiculare |
Cucumber leaf tissue infected with Colletotrichum orbiculare as seen under a compound microscope. Dark hair-like structures are setae of the fungus and are diagnostic of the disease. July 1997 |
| 1573177 |
powdery mildew |
Erysiphe pisi |
Powdery mildew cleistothecia on pea leaf. June 1997 |
| 1572870 |
black spot |
Alternaria brassicicola |
Leaf spot on cabbage caused by Alternaria brassicicola or A. brassicae. April 1997? |
| 1572869 |
black spot |
Alternaria brassicicola |
Leaf spot on cabbage caused by Alternaria brassicicola or A. brassicae. April 1997? |
| 1572861 |
black spot |
Alternaria brassicicola |
Chinese cabbage leaf showing many lesions caused by Alternaria brassicicola. April 1997? |
| 1572862 |
black spot |
Alternaria brassicicola |
Chinese cabbage leaf showing many lesions caused by Alternaria brassicicola. April 1997? |
| 1572859 |
black spot |
Alternaria brassicicola |
Leaf spot on cabbage caused by Alternaria brassicicola or A. brassicae. April 1997 |
| 1572820 |
anthracnose |
Colletotrichum fragariae |
Anthracnose fruit rot (black spot) can be caused by Colletotrichum fragariae, C. acutatum, C. dematium and C. gloeosporoides. April 1997?? |
| 1572545 |
Stemphylium leaf spot |
Stemphylium botryosum |
Symptoms of Stemphylium leaf spot. January 1997 |
| 1572544 |
downy mildew |
Peronospora trifoliorum |
Symptoms of downy mildew on the uppecr leaf surface. January 1997 |
| 1572543 |
downy mildew |
Peronospora trifoliorum |
Symptoms of downy mildew on the lower leaf surface. January 1997 |
| 1572542 |
downy mildew |
Peronospora trifoliorum |
Symptoms of downy mildew on the lower leaf surface. January 1997 |
| 1572541 |
downy mildew |
Peronospora trifoliorum |
Symptoms of downy mildew on the lower leaf surface. January 1997 |
| 1572540 |
downy mildew |
Peronospora trifoliorum |
Symptoms of downy mildew on the lower leaf surface. January 1997 |
| 1572539 |
downy mildew |
Peronospora trifoliorum |
Symptoms of downy mildew on the upper leaf surface. January 1997 |
| 1572538 |
downy mildew |
Peronospora trifoliorum |
Symptoms of downy mildew on the upper leaf surface. January 1997 |
| 1572537 |
downy mildew |
Peronospora trifoliorum |
Symptoms of downy mildew on the upper leaf surface. January 1997 |
| 1571929 |
downy mildew |
Peronospora destructor |
Abundant sporulation of Peronospora destructor on onion leaf. February 1996 |
| 1571734 |
downy mildew |
Peronospora farinosa |
Sporulation of Peronospora farinosa on spinach leaf. December 1995 |
| 1571111 |
downy mildew |
Peronospora farinosa |
Spinach leaf showing angular chlorotic lesions caused by the pathogen Peronospora farinosa. March 1995 |
| 1571108 |
downy mildew |
Peronospora farinosa |
Underside of spinach leaf showing sporulation of the pathogen (Peronospora farinosa). March 1995 |
| 1571106 |
downy mildew |
Peronospora farinosa |
Underside of spinach leaf showing sporulation of the pathogen (Peronospora farinosa). March 1995 |
| 1570302 |
Pestalotiopsis blight |
Pestalotiopsis quepinii |
Conidia of Pestalotiopsis guepinii. December 1991 |
| 1570314 |
leaf spot |
Stemphylium sarciniforme |
Stemphylium sarciniforme (400X). December 1991 |
| 1571333 |
late blight |
Phytophthora infestans |
Light micrograph of Phytophthora infestans from potato leaf. Small, dark, football-shaped bodies are sporangia. June 1995 |
| 1571334 |
late blight |
Phytophthora infestans |
Light micrograph of Phytophthora infestans from potato leaf. Small, dark, football-shaped bodies are sporangia. June 1995 |
| 1577301 |
anthracnose |
Colletotrichum orbiculare |
|
| 1571082 |
powdery mildew |
Erysiphe betae |
Underside of leaf showing powdery mildew of sugar beet caused by Erysiphe polygoni. March 1995 |
| 1571083 |
powdery mildew |
Erysiphe betae |
Underside of leaf showing powdery mildew caused by Erysiphe polygoni. March 1995 |
| 1571084 |
powdery mildew |
Erysiphe betae |
Close-up of underside of leaf showing powdery mildew caused by Erysiphe polygoni. March 1995 |
| 1571086 |
powdery mildew |
Erysiphe betae |
Close-up of sugar beet leaf showing powdery mildew caused by Erysiphe polygoni. March 1995 |
| 1571089 |
powdery mildew |
Erysiphe betae |
A single powdery mildew (caused by Erysiphe polygoni) lesion on the underside of a sugar beet leaf. March 1995 |
| 1570299 |
brown spot |
Alternaria alternata |
Altenaria alternata (400X). December 1991 |
| 1570300 |
brown spot |
Alternaria alternata |
Chains of conidia of Alternaria alternata (100X). December 1991 |
| 1570301 |
Ascochyta fungi |
Ascochyta spp. |
Conidia of Ascochyta sp. (400X). December 1991 |
| 1570306 |
downy mildew |
Peronospora farinosa |
Mass of sporangia and sporangiophores of Peronospora effusa (100X, phase contrast). December 1991 |
| 1570307 |
anthracnose |
Colletotrichum graminicola |
Colletotrichum graminicola (400X), causal agent of anthracnose diseases. December 1991 |
| 1570373 |
powdery mildew |
Oidium spp. |
Scanning electron micrograph of appressoria of Oidium sp. on Euonymus. |
| 1570374 |
powdery mildew |
Oidium spp. |
Transmission electron micrograph (TEM) of thin section through appressorium of Oidium sp. on Euonymus. Yellow flecks are not part of image, but are surface contaminants of film. February 1992 |
| 1570375 |
powdery mildew |
Oidium spp. |
Scanning electron micrograph (SEM) of leaf surface of Euonymus showing hyphae and appressoria of Oidium sp. Yellow flecks are not part of image, but are surface contaminants of film. February 1992 |
| 1570376 |
powdery mildew |
Oidium spp. |
Scanning electron micrograph (SEM) of conidia of Oidium sp. February 1992 |
| 1570377 |
powdery mildew |
Oidium spp. |
Transmission electron micrograph (TEM) of thin section through appressorium of Oidium sp. on Euonymus. Club-shaped structure is the tip of the appressorium (penetration peg) extending into a host cell. February 1992 |
| 1570378 |
powdery mildew |
Oidium spp. |
Transmission electron micrograph (TEM) of thin section through Oidium sp. on Euonymus at stomatal opening. February 1992 |
| 1570379 |
powdery mildew |
Oidium spp. |
Transmission electron micrograph (TEM) of thin section through appressorium of Oidium sp. on Euonymus. Fungal cell is above and within the host cell. February 1992 |
| 1570380 |
powdery mildew |
Oidium spp. |
Transmission electron micrograph (TEM) of thin section through appressorium and penetration peg of Oidium sp. on Euonymus. Club-shaped structure is the tip of the penetration peg extending into a host cell. February 1992 |
| 1570381 |
powdery mildew |
Oidium spp. |
Transmission electron micrograph (TEM) of Oidium sp. (cause of powdery mildew) appressorium and penetration peg. February 1992 |
| 1570382 |
powdery mildew |
Oidium spp. |
Transmission electron micrograph (TEM) of Oidium sp. (cause of powdery mildew) appressorium and penetration peg. February 1992 |
| 1570383 |
powdery mildew |
Oidium spp. |
Transmission electron micrograph (TEM) of Oidium sp. (cause of powdery mildew) appressorium and penetration peg. February 1992 |
| 1570385 |
powdery mildew |
Oidium spp. |
Transmission electron micrograph (TEM) of Oidium sp. (cause of powdery mildew) appressorium and penetration peg. February 1992 |
| 1570386 |
powdery mildew |
Oidium spp. |
Transmission electron micrograph (TEM) of Oidium sp. (cause of powdery mildew) appressorium and penetration peg. February 1992 |
| 1570387 |
powdery mildew |
Oidium spp. |
Transmission electron micrograph (TEM) of Oidium sp. (cause of powdery mildew) showing multiple appressoria and penetration pegs. February 1992 |
| 1570477 |
Phytophthora basal canker |
Phytophthora palmivora |
Brown rot caused by Phytophthora palmivora. May 1992 |
| 1571043 |
late blight |
Phytophthora infestans |
|
| 1571046 |
late blight |
Phytophthora infestans |
Leaf underside |
| 1571049 |
late blight |
Phytophthora infestans |
|
| 5377179 |
downy mildew |
Pseudoperonospora cubensis |
|
| 5377178 |
downy mildew |
Pseudoperonospora cubensis |
Dichotomously branched sporangiophore and lemon-shaped sporangia of P. cubensis at 400x magnification. |
| 5340093 |
downy mildew |
Pseudoperonospora cubensis |
Cucumber cv. LaFayette; downy mildew caused by Pseudoperonospora cubensis; leaves collected during rain and scanned on a flatbed scanner a few hours later; shows watersoaking of tissue shortly before sporulation; See 5340094 for view of upper leaf surface of same leaf. |
| 5340094 |
downy mildew |
Pseudoperonospora cubensis |
cucumber cv. LaFayette; downy mildew caused by Pseudoperonospora cubensis; leaves collected during rain and scanned on a flatbed scanner a few hours later; shows watersoaking of tissue shortly before sporulation; See 5340093 for view of lower leaf surface of same leaf. Water soaking is much more subtle on upper leaf surface. |
