| 1572312 |
Stemphylium leaf blight and stalk rot |
Stemphylium vesicarium |
Onion umbel stalk showing a lesion caused by Stemphylium vesicarium. Note the concentric rings. July 1996 |
| 1572311 |
Stemphylium leaf blight and stalk rot |
Stemphylium vesicarium |
Onion umbel stalk showing a lesion caused by Stemphylium vesicarium. Note the concentric rings. July 1996 |
| 1572308 |
Stemphylium leaf blight and stalk rot |
Stemphylium vesicarium |
Onion umbel stalk showing a lesion caused by Stemphylium vesicarium. Note the concentric rings. July 1996 |
| 1570866 |
Stemphylium leaf blight and stalk rot |
Stemphylium vesicarium |
Stemphylium leaf blight on onion; March 1995 |
| 5435810 |
Botrytis leaf blight |
Botrytis squamosa |
|
| 5435811 |
Botrytis leaf blight |
Botrytis squamosa |
|
| 5435812 |
Botrytis leaf blight |
Botrytis squamosa |
|
| 5435813 |
Botrytis leaf blight |
Botrytis squamosa |
|
| 5435814 |
Botrytis leaf blight |
Botrytis squamosa |
|
| 1570865 |
downy mildew |
Peronospora destructor |
March 1995 |
| 1571061 |
downy mildew |
Peronospora destructor |
Light colored patch in field (upper center of frame) is downy mildew. March 1995 |
| 1571062 |
downy mildew |
Peronospora destructor |
Chlorotic patches in field are caused by downy mildew. March 1995 |
| 1571063 |
downy mildew |
Peronospora destructor |
Chlorosis is caused by downy mildew. March 1995 |
| 1571065 |
downy mildew |
Peronospora destructor |
Chlorotic patches in field are caused by downy mildew. March 1995 |
| 1571066 |
downy mildew |
Peronospora destructor |
Chlorotic patches in field are caused by downy mildew. March 1995 |
| 1571067 |
downy mildew |
Peronospora destructor |
Chlorotic patches in field are caused by downy mildew. March 1995 |
| 1571068 |
downy mildew |
Peronospora destructor |
Yellowing of plants is caused by downy mildew. March 1995 |
| 1571069 |
downy mildew |
Peronospora destructor |
Chlorotic patches on leaves are caused by downy mildew. March 1995 |
| 1571159 |
downy mildew |
Peronospora destructor |
Large patches of discolored plant tissue are the result of downy mildew. April 1995 |
| 1571160 |
downy mildew |
Peronospora destructor |
Large patches of discolored plant tissue are the result of downy mildew. April 1995 |
| 1571161 |
downy mildew |
Peronospora destructor |
Large patches of discolored plant tissue are the result of downy mildew. April 1995 |
| 1571165 |
downy mildew |
Peronospora destructor |
Large patches of discolored plant tissue are the result of downy mildew. Darker green areas in the upper left of frame are not as affected. April 1995 |
| 1571075 |
downy mildew |
Peronospora destructor |
Chlorotic patches on leaves are caused by downy mildew. March 1995 |
| 1571076 |
downy mildew |
Peronospora destructor |
The downy mildew pathogen (Peronospora destructor) produces a downy growth on the leaf surface. March 1995 |
| 1571077 |
downy mildew |
Peronospora destructor |
The downy mildew pathogen (Peronospora destructor) produces a downy growth on the leaf surface (center frame; left edge of leaf) which eventually kills the leaf. March 1995 |
| 5358528 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Bacteriophage plaques in the laboratory - Xanthomonas leaf blight bacteria growing on culture medium. |
| 5358529 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Bacteriophage plaques in the laboratory - Xanthomonas leaf blight bacteria growing on culture medium. |
| 5358530 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Bacteriophage plaques in the laboratory - Xanthomonas leaf blight bacteria growing on culture medium. |
| 5358531 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Bacteriophage plaques in the laboratory - Xanthomonas leaf blight bacteria growing on culture medium. |
| 5358532 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Bacteriophage plaques in the laboratory - Xanthomonas leaf blight bacteria growing on culture medium. |
| 5358533 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Bacteriophage plaques in the laboratory - Xanthomonas leaf blight bacteria growing on culture medium. |
| 5358534 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Bacteriophage plaques in the laboratory - Xanthomonas leaf blight bacteria growing on culture medium. |
| 5358535 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Bacteriophage plaques in the laboratory - Xanthomonas leaf blight bacteria growing on culture medium. |
| 5358536 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Bacteriophage plaques in the laboratory - Xanthomonas leaf blight bacteria growing on culture medium. |
| 5362727 |
purple blotch |
Alternaria porri |
onion purple blotch, disease, Alternaria porri |
| 5362265 |
downy mildew |
Peronospora destructor |
Onion plants displaying symptoms of downy mildew, Peronospora destructor. |
| 5367339 |
powdery mildew |
Leveillula taurica |
Powdery mildew (Leveillula taurica) on leaves of onion, in the field. |
| 5367338 |
powdery mildew |
Leveillula taurica |
Close-up view of powdery mildew (Leveillula taurica) on onion leaves. |
| 5360021 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion leaves showing symptoms of Xanthomonas Leaf Blight. |
| 5360022 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion leaves showing symptoms of Xanthomonas Leaf Blight. |
| 5360020 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing symptoms of Xanthomonas Leaf Blight. |
| 5360019 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion leaves showing symptoms of Xanthomonas Leaf Blight. |
| 5360018 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion leaves showing symptoms of Xanthomonas Leaf Blight. |
| 5360017 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing symptoms of Xanthomonas Leaf Blight. |
| 5360015 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing symptoms of Xanthomonas Leaf Blight. |
| 5360016 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing symptoms of Xanthomonas Leaf Blight. |
| 5360014 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing symptoms of Xanthomonas Leaf Blight. |
| 5360012 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing symptoms of Xanthomonas Leaf Blight. |
| 5360013 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing symptoms of Xanthomonas Leaf Blight. |
| 5360011 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing symptoms of Xanthomonas Leaf Blight. |
| 5360009 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing symptoms of Xanthomonas Leaf Blight. |
| 5360010 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing symptoms of Xanthomonas Leaf Blight. |
| 5360008 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing symptoms of Xanthomonas Leaf Blight. |
| 5359780 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
A field onion plant leaf showing symptoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii. |
| 5359779 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Field onion plants showing symptoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii. |
| 5359778 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Field onion plants showing symptoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii. |
| 5359777 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Field onion plant leaves showing symptoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii. |
| 5359776 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
A field onion plants showing symptoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii. |
| 5359774 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
A field onion plant leaf showing symptoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii. |
| 5359775 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
A field onion plant leaf showing symptoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii. |
| 5362264 |
downy mildew |
Peronospora destructor |
Onion downy mildew disease (Peronospora destructor). |
| 5362263 |
purple blotch |
Alternaria porri |
Purple blotch (Alternaria porri), a disease of onions. |
| 5362222 |
downy mildew |
Peronospora destructor |
Agricultural Research Demonstration Education Center (ARDEC), Fort Collins, Colorado onion trial, Onion Disease, Onion Downy Mildew, Pesticide application |
| 5362218 |
downy mildew |
Peronospora destructor |
Agricultural Research Demonstration Education Center (ARDEC), Fort Collins, Colorado onion trial, 09/10/1997, Onion Disease, Onion Downy Mildew, Pesticide application |
| 5366488 |
onion rust |
Puccinia allii |
Evidence of Puccinia porri (P. allii), a rust infecting onions. |
| 5366489 |
onion rust |
Puccinia allii |
Pustules of Puccinia porri (P. allii), a rust infecting onions. |
| 5365292 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plant showing blight sypmtoms caused by the bacteria Xanthomonas axonopodis pv. allii in the field. |
| 5365293 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plant showing blight sypmtoms caused by the bacteria Xanthomonas axonopodis pv. allii in the field. |
| 5365294 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plant showing blight sypmtoms caused by the bacteria Xanthomonas axonopodis pv. allii in the field. |
| 5365295 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plant showing blight sypmtoms caused by the bacteria Xanthomonas axonopodis pv. allii in the field. |
| 5365296 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plant showing blight sypmtoms caused by the bacteria Xanthomonas axonopodis pv. allii in the field. |
| 5365297 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plant showing blight sypmtoms caused by the bacteria Xanthomonas axonopodis pv. allii in the field. |
| 5365298 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plant showing blight sypmtoms caused by the bacteria Xanthomonas axonopodis pv. allii in the field. |
| 5365862 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plant showing blight sypmtoms caused by the bacteria Xanthomonas axonopodis pv. allii in the field. |
| 5365861 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plant showing blight sypmtoms caused by the bacteria Xanthomonas axonopodis pv. allii in the field. |
| 5365859 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plant leaves showing blight sypmtoms caused by the bacteria Xanthomonas campestris in the field. |
| 5365860 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plant leaves showing blight sypmtoms caused by the bacteria Xanthomonas campestris in the field. |
| 5365280 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing blight sypmtoms caused by the bacteria Xanthomonas campestris in the field. |
| 5365281 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing blight sypmtoms caused by the bacteria Xanthomonas campestris in the field. |
| 5365278 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing blight sypmtoms caused by the bacteria Xanthomonas campestris in the field. |
| 5365279 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing blight sypmtoms caused by the bacteria Xanthomonas campestris in the field. |
| 5365277 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing blight sypmtoms caused by the bacteria Xanthomonas campestris in the field. |
| 5365284 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plant leaves showing blight sypmtoms caused by the bacteria Pantoea ananitas and Xanthomonas campestris in the field. |
| 5365282 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plant leaves showing blight sypmtoms caused by the bacteria Pantoea ananitas and Xanthomonas campestris in the field. |
| 5365283 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing blight sypmtoms caused by the bacteria Pantoea ananitas and Xanthomonas campestris in the field. |
| 5365267 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
An onion plant leaf showing blight sypmtoms caused by the bacteria Xanthomonas campestris in the field. |
| 5361700 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing sypmtoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii in the field. |
| 5361699 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing sypmtoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii in the field. |
| 5361698 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
A close-up view of an onion plant leaf showing sypmtoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii on the field. |
| 5361697 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
A close-up view of an onion plant leaf showing sypmtoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii on the field. |
| 5361696 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing sypmtoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii on the field. |
| 5361589 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
A close-up view of onion plant leaves showing sypmtoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii on a field at Granada. |
| 5361588 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
A close-up view of onion plant leaves showing sypmtoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii on a field at Granada. |
| 5361586 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing sypmtoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii on a field at Granada. |
| 5361587 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
Onion plants showing sypmtoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii in a field at Granada. |
| 5361590 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
A close-up view of onion plant leaves showing sypmtoms of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii on a field at Granada. |
| 5364058 |
purple blotch |
Alternaria porri |
Purple blotch lesion on the neck region of an onion plant caused by Alternaria porri. |
| 5364057 |
downy mildew |
Peronospora destructor |
A close-up shot of downy mildew Peronospora destructor on an onion leaf. |
| 5364056 |
purple blotch |
Alternaria porri |
An onion fungicide test plot at Vineland used in the study of onion purple blotch caused by Alternaria porri. |
| 5362728 |
purple blotch |
Alternaria porri |
onion purple blotch, disease, Alternaria porri |
| 5362948 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
A scenic view of an onion field with symptoms of Xanthomonas leaf blight caused by Xanthomonas axonopodis pv. allii. |
| 5362947 |
Xanthomonas leaf blight of onion |
Xanthomonas axonopodis pv. allii |
A scenic view of an onion field with symptoms of Xanthomonas leaf blight caused by Xanthomonas axonopodis pv. allii. |
| 5362946 |
purple blotch |
Alternaria porri |
A field trial of onions for the purple blocth disease caused by Alternaria porri. |
| 5362945 |
purple blotch |
Alternaria porri |
A field trial of onions for the purple blocth disease caused by Alternaria porri. |
| 5362944 |
purple blotch |
Alternaria porri |
An onion field during the mid stages of the purple blocth disease caused by Alternaria porri trial in the field. |
| 5362943 |
purple blotch |
Alternaria porri |
An onion field during the mid stages of the purple blocth disease caused by Alternaria porri trial in the field. |
| 5362942 |
purple blotch |
Alternaria porri |
An onion field during the early stages of the purple blocth disease caused by Alternaria porri trial in the field. |
| 5362941 |
purple blotch |
Alternaria porri |
An onion plant with the purple blocth disease caused by Alternaria porri in the field. |
| 5362939 |
purple blotch |
Alternaria porri |
An onion plant with the purple blocth disease caused by Alternaria porri in the field. |
| 5362940 |
purple blotch |
Alternaria porri |
An onion plant with the purple blocth disease caused by Alternaria porri in the field. |
| 5362926 |
purple blotch |
Alternaria porri |
A volunteer onion plant with the purple blocth disease caused by Alternaria porri in a winter wheat field as identified by Dave Herrera. |
| 5362925 |
purple blotch |
Alternaria porri |
A volunteer onion plant with the purple blocth disease caused by Alternaria porri in a winter wheat field |
| 5361514 |
onion smudge |
Colletotrichum circinans |
An onion bulb with symptoms of the onion smudge disease caused by Colletotrichum circinans. |
| 5361488 |
purple blotch |
Alternaria porri |
An in-filed focus on the symptoms of purple blotch Alternaria porri on a field of onion plants. |
| 5361487 |
purple blotch |
Alternaria porri |
Advanced symptoms of onion purple blotch Alternaria porri on a field of onion plants. |
| 5361486 |
purple blotch |
Alternaria porri |
Early leaf symptoms of onion purple blotch Alternaria porri on onion. |
| 5361485 |
downy mildew |
Peronospora destructor |
An in-filed focus of onion downy mildew, Peronospora destructor. |
| 5361484 |
downy mildew |
Peronospora destructor |
Advanced leaf symptoms of downy mildew, Peronospora destructor on a field of onion plants |
| 5361483 |
downy mildew |
Peronospora destructor |
Advanced leaf symptoms of downy mildew, Peronospora destructor on a field of onion plants. |
| 5361482 |
downy mildew |
Peronospora destructor |
Early leaf symptoms of downy mildew, Peronospora destructor on a field onion plants. |
| 5361481 |
downy mildew |
Peronospora destructor |
Early leaf symptoms of downy mildew, Peronospora destructor on a field onion plant leaf. |
| 5361480 |
downy mildew |
Peronospora destructor |
Early leaf symptoms of downy mildew, Peronospora destructor on a field onion plant leaf. |
| 5361476 |
onion smudge |
Colletotrichum circinans |
A matured onion bulb showing the onion smudge disease. |
| 5357622 |
downy mildew |
Peronospora destructor |
Graphic display of downy mildew on onions |
| 5357391 |
downy mildew |
Peronospora destructor |
Onions in a research plot studying downy mildew. |
| 5357390 |
downy mildew |
Peronospora destructor |
Onions in plot researching downy mildew. |
| 5357389 |
downy mildew |
Peronospora destructor |
Onions in a field plot, research on downy mildew. |
| 5357388 |
downy mildew |
Peronospora destructor |
Field plot, research on downy mildew in onions. |
| 5357387 |
downy mildew |
Peronospora destructor |
Field plot, research conducted on downy mildew in onions. |
| 5357386 |
downy mildew |
Peronospora destructor |
Weather station set up in an onion field for research on downy mildew. |
