Donald Groth's Images
Title: ProfessorOrganization: Louisiana State University Ag Center
Unit: Rice Research Station
Country: United States
Web: http://www.lsuagcenter.com\ricediseases
 |
Donald Groth is a F. Avalon Dagget Professor of Rice Pathology and Research Coordinator at the LSU AgCenter Rice Research Station in Crowley Louisiana. He has been working with the rice varietal development team for 25 years. His interests include development of host disease resistance, cultural management of rice diseases, and chemical control. He is a 1983 graduate of Iowa State University. |
| 193 Images of 40 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 5410641 | wheat leaf rust | Puccinia recondita | Symptoms of wheat rust on leaves. |
| 5410640 | wheat leaf rust | Puccinia recondita | Symptoms of wheat rust in small plots. |
| 5410709 | wheat stem rust | Puccinia graminis | |
| 5410710 | wheat stem rust | Puccinia graminis | |
| 5410711 | wheat stem rust | Puccinia graminis | |
| 5410708 | wheat stem rust | Puccinia graminis | |
| 5410700 | Gibberella stalk rot | Gibberella zeae | conidia |
| 5410704 | Gibberella stalk rot | Gibberella zeae | sporulating |
| 5410678 | rice | Oryza sativa | Sterile rice pollen, from male sterile line, stained with Iodine showing absense of starch. |
| 5410679 | straight head | Curved palea and lemma symptoms on rice grain called parrot beak due to the straight head disorder. | |
| 5410680 | straight head | Upright heads with sterile grain due to the straight head disorder. | |
| 5410686 | rust | Puccinia hordei | |
| 5410687 | rust | Puccinia hordei | urediospores |
| 5410656 | rice | Oryza sativa | Rice levee fabric flood depth control structure. |
| 5410657 | rice | Oryza sativa | Rice levees with fabric flood depth control structures installed. |
| 5410664 | rice | Oryza sativa | Rice pistol stained with Iodine. |
| 5410666 | rice | Oryza sativa | damage after crawfish |
| 5410670 | rice | Oryza sativa | Scouting rice for diseases with a PVC "T". |
| 5410671 | rice | Oryza sativa | Scum floating on rice flood water. |
| 5410675 | Rhizoctonia damping-off, blight and rot | Rhizoctonia solani | Field view of shealth blight resistant and susceptible lines. |
| 5410650 | rice | Oryza sativa | Ditch in rice field for drainage. |
| 5410652 | rice | Oryza sativa | Drain in rice field. |
| 5410646 | copper toxicity | Rice leaves showing of copper fungicide phytotoxicity. | |
| 5410647 | rice | Oryza sativa | Purple leaf rice variety used as marker in disease nursey. |
| 5410621 | rice | Oryza sativa | Flexible pipe used as water control structure in rice field levee. |
| 5410622 | Narrow brown leaf spot | Cercospora janseana | Cercospora janseana sporulation from a narrow brown leaf spot. |
| 5410623 | Narrow brown leaf spot | Cercospora janseana | Cercospora janseana sporulation from a narrow brown leaf spot. |
| 5410632 | rice | Oryza sativa | Fertile rice pollen stained with Iodine showing presense of starch. |
| 5410635 | rice | Oryza sativa | Rice field being flagged to spot airplane passes. |
| 5410676 | rice | Oryza sativa | Slick surface of rice field after water seeding and drainage. |
| 5410644 | lightning | Lightning strike in soybean field. | |
| 5410642 | leaf smut of rice | Entyloma oryzae | Up close view of rice leaves showing signs and symptoms of infection with leaf smut. |
| 5410669 | rice | Oryza sativa | Rice levee with pipe installed for water depth management. |
| 5410653 | rice | Oryza sativa | Flooding rice field from underground irrigation sysytem. |
| 5410654 | rice | Oryza sativa | Rice field leveled with land plane. |
| 5410655 | rice | Oryza sativa | Underground irrigation sysytem control structure. |
| 5410651 | rice | Oryza sativa | Rice field ditcher. |
| 5410649 | rice | Oryza sativa | Disking rice field in preparation for planting. |
| 5410634 | rice | Oryza sativa | Rice field being leveled with land plane. |
| 5410638 | rice | Oryza sativa | Rice field being leveled with laser guided bucket. |
| 5410633 | rice | Oryza sativa | Rice field being leveled with land plane. |
| 5410628 | rice | Oryza sativa | Diesel powered well that pumps water from the aquifer to flood rice fields. |
| 5410629 | rice | Oryza sativa | Drill-seeded rice germinating. |
| 5410630 | rice | Oryza sativa | Disking rice field in preparation for planting. Egrets feeding in field. |
| 5410613 | rice | Oryza sativa | Agricultural airplane applying granules to rice crop. |
| 5410648 | rice | Oryza sativa | Rice disease nursey. |
| 5410620 | rice | Oryza sativa | Heads showing boot split and headed growth stages. |
| 5410696 | Fusarium wilts, blights, rots and damping-off | Fusarium spp. | |
| 5410691 | loose smut of wheat or barley | Ustilago tritici | |
| 5410692 | loose smut of wheat or barley | Ustilago tritici | |
| 5410663 | rice | Oryza sativa | Heading rice with heads partially exerted. |
| 5410639 | Fusarium wilts, blights, rots and damping-off | Fusarium spp. | Late symptoms of wheat scab. |
| 5410636 | rice | Oryza sativa | Headed rice with heads completely exerted. |
| 5410637 | rice | Oryza sativa | Heading rice with heads partially exerted. |
| 5410627 | crawfish | Procambarus spp. | Crawfish mound of mud pushed up out of the burrow by the crawfish. |
| 5410624 | crawfish | Procambarus spp. | Mound in a rice field |
| 5410626 | crawfish | Procambarus spp. | Commercial crawfish fishing in a rice field. |
| 5410625 | crawfish | Procambarus spp. | Track left by commercial crawfish fishing ina a rice field. |
| 5410610 | rice | Oryza sativa | Rice with 10% of heads showing heads. |
| 5410701 | Fusarium wilts, blights, rots and damping-off | Fusarium spp. | Resistant and susceptible symptoms of wheat scab. |
| 5410702 | Fusarium wilts, blights, rots and damping-off | Fusarium spp. | Resistant ans susceptible symptoms of wheat scab. |
| 5410703 | Fusarium wilts, blights, rots and damping-off | Fusarium spp. | |
| 5410705 | Fusarium wilts, blights, rots and damping-off | Fusarium spp. | |
| 5410699 | Fusarium wilts, blights, rots and damping-off | Fusarium spp. | |
| 5410697 | Fusarium wilts, blights, rots and damping-off | Fusarium spp. | |
| 5410698 | Fusarium wilts, blights, rots and damping-off | Fusarium spp. | |
| 5410694 | Fusarium wilts, blights, rots and damping-off | Fusarium spp. | |
| 5410695 | Fusarium wilts, blights, rots and damping-off | Fusarium spp. | |
| 5410693 | Fusarium wilts, blights, rots and damping-off | Fusarium spp. | |
| 5410690 | loose smut of wheat or barley | Ustilago tritici | |
| 5410685 | rust | Puccinia hordei | |
| 5410688 | rust | Puccinia hordei | |
| 5410674 | Fusarium wilts, blights, rots and damping-off | Fusarium spp. | |
| 5410684 | rust | Puccinia hordei | |
| 5410706 | Septoria leaf spot and cankers | Septoria spp. | |
| 5410665 | rice | Oryza sativa | Seeding rice being grown in a green house. |
| 5410712 | White Leaf Streak of Rice | Mycovellosiella oryzae | |
| 5410707 | Septoria leaf spot and cankers | Septoria spp. | |
| 5410689 | rust | Puccinia hordei | Teliospore stage symptoms of wheat rust on wheat leaves. |
| 5410682 | rice | Oryza sativa | Water-seeded rice field showing fallen seedlings on soil surface. |
| 5410683 | rice | Oryza sativa | Flooded water seeded rice field showing clumping of seeds. |
| 5410677 | stem rot of rice | Sclerotium oryzae | Rice shealth showing sclerotia imbedded in tissues. |
| 5410673 | brown spot of rice | Cochliobolus miyabeanus | Rice leaf showig severe brown spot leaf symptoms. |
| 5410672 | Septoria leaf spot and cankers | Septoria spp. | Wheat leaf showing Septoia leaf blotch symptoms. |
| 5410667 | rice | Oryza sativa | Rice stubble being burned. |
| 5410668 | rice | Oryza sativa | Rice stubble being burned. |
| 5410659 | rice | Oryza sativa | Rice being grown in a green house. |
| 5410660 | rice | Oryza sativa | Rice being grown in a gree house. |
| 5410661 | rice | Oryza sativa | Rice being transferred from the combine to a grain cart while harvest continues. |
| 5410662 | rice | Oryza sativa | |
| 5410658 | rice | Oryza sativa | Rice grain cart used to transport rie from the combine in the field to a truck. |
| 5410645 | Narrow brown leaf spot | Cercospora janseana | Rice leaves showing signs of infection with narrow brown leaf spot compared to other leaf diseases. |
| 5410643 | leaf smut of rice | Entyloma oryzae | Rice leaves showing signs and severe symptons of infection with leaf smut. |
| 5410631 | false smut | Ustilaginoidea virens | Rice grain showing symptoms and signs of early infection with false smut. |
| 5410614 | bacterial panicle blight | Burkholderia glumae | Bacterial panicle blight infection of rice heads in the field showing upright discolored heads. |
| 5410615 | bacterial panicle blight | Burkholderia glumae | Rice head with symptoms of Bacterial panicle blight infection on the grain. |
| 5410611 | Alternaria leaf spot | Alternaria padwickii | Rice leaves showing symptoms of Alternaria leaf spot. |
| 5410612 | Alternaria leaf spot | Alternaria padwickii | Rice leaves showing symtpoms of Alternaria leaf spot. |
| 5410619 | Cochliobolus leaf spot / black kernel | Cochliobolus lunatus | Infected rice grain showing signs and symptoms of black kernal. |
| 5390541 | Rhizoctonia damping-off, blight and rot | Rhizoctonia solani | Rhizoctonia solani mycelium from culture on PDA; isolated from rice; rice sheath blight |
| 5390511 | leaf scald | Monographella albescens | Rice leaves with chevron leaf scald symptoms |
| 5390512 | leaf scald | Monographella albescens | Rice leaves showing tan type symptoms of leaf scald infection |
| 5390477 | Cochliobolus leaf spot / black kernel | Cochliobolus lunatus | Fungal spores of the black kernel pathogen |
| 5390478 | Cochliobolus leaf spot / black kernel | Cochliobolus lunatus | Black kernel grain infection |
| 5390497 | take-all root rot / sheath rot | Gaeumannomyces graminis | crown sheath rot symptoms on rice |
| 5390498 | take-all root rot / sheath rot | Gaeumannomyces graminis | Rice plant showing symptoms of Crown sheath rot infection |
| 5390516 | Narrow brown leaf spot | Cercospora janseana | Rice leaves showing signs of infection with narrow brown leaf spot |
| 5390517 | Narrow brown leaf spot | Cercospora janseana | Rice leaves showing signs of infection with narrow brown leaf spot |
| 5390503 | Pythium diseases | Pythium spp. | Rice fine roots rotted by various fungal pathogens |
| 5390529 | Pythium diseases | Pythium spp. | Rice roots showing symptoms of rot by several fungal pathogens |
| 5390532 | Fusarium wilts, blights, rots and damping-off | Fusarium spp. | Fusarium spp. spores form scab infected rice grain; Fusarium head blight |
| 5390533 | Fusarium wilts, blights, rots and damping-off | Fusarium spp. | Rice grain showing symptoms and signs of Fusarium head blight infection caused by Fusarium spp. |
| 5390563 | water mold | Achlya spp. | Rice seed infected with water mold showing pathogen hyphae radiating out into water |
| 5390564 | water mold | Achlya spp. | Mycelium and wet areas around rice seeds infected with water molds |
| 5390522 | brown spot of rice | Cochliobolus miyabeanus | grain infection symptoms |
| 5390523 | brown spot of rice | Cochliobolus miyabeanus | Peck infected milled rice grain showing symptoms |
| 5390534 | brown spot of rice | Cochliobolus miyabeanus | Rice seedlings with symptoms of seedling blight |
| 5390538 | Rhizoctonia damping-off, blight and rot | Rhizoctonia solani | Field view of severe early upper rice leaf infection symptoms of rice sheath blight |
| 5390539 | Rhizoctonia damping-off, blight and rot | Rhizoctonia solani | Field view of severe late upper leaf infection symptoms of rice sheath blight |
| 5390542 | Rhizoctonia damping-off, blight and rot | Rhizoctonia solani | Water soaked initial rice sheath blight lesion symptoms on rice stems |
| 5390543 | Rhizoctonia damping-off, blight and rot | Rhizoctonia solani | Rice sheath blight symptoms (snake skin appearance) and signs (black sclerotia) on a rice leaf |
| 5390544 | Rhizoctonia damping-off, blight and rot | Rhizoctonia solani | Variation of early Rice sheath blight symptoms on rice stems- from left to right- water soaked lesion, dark resistance reaction or fungicide application lesion, and dried lesions |
| 5390545 | Rhizoctonia damping-off, blight and rot | Rhizoctonia solani | Snake skin like Rice sheath blight symptoms on rice leaves |
| 5390546 | Rhizoctonia damping-off, blight and rot | Rhizoctonia solani | Snake skin like Rice sheath blight symptoms on rice stems |
| 5390547 | Rhizoctonia damping-off, blight and rot | Rhizoctonia solani | Rice sheath blight symptoms and pathogen signs (sclerotia) on rice head |
| 5390556 | rice stink bug | Oebalus pugnax | Rice stink bug feeding scar symptoms on rice grain |
| 5390562 | Pythium diseases | Pythium spp. | Mycelium causing wet areas around rice seeds infected with water molds |
| 5390467 | rice | Oryza sativa | Agricultural airplane applying fungicide to rice crop |
| 5390468 | bacterial leaf blight of rice | Xanthomonas oryzae pv. oryzae | Rice leaves showing symptoms of bacterial blight infection in the field. |
| 5390469 | bacterial leaf streak | Xanthomonas oryzae pv. oryzicola | Rice leaves showing symptoms of bacterial leaf streak infection in the field. |
| 5390470 | bacterial panicle blight | Burkholderia glumae | Burkholderia glumae Colony on King’s medium B medium, note yellow green toxin production in agar |
| 5390471 | bacterial panicle blight | Burkholderia glumae | Severe bacterial panicle blight infection of rice heads in the field. |
| 5390472 | bacterial panicle blight | Burkholderia glumae | Bacterial panicle blight infection of rice heads in the field showing cluster of upright discolored heads |
| 5390473 | bacterial panicle blight | Burkholderia glumae | Bacterial panicle blight infection of rice grain showing characteristic two tone discoloration symptom. |
| 5390474 | bacterial panicle blight | Burkholderia glumae | Late symptoms of bacterial panicle blight infection of rice head showing secondary fungal infection compared to a healthy head |
| 5390475 | bacterial panicle blight | Burkholderia glumae | Early infection by the bacterial panicle blight pathogen of rice grain showing discoloration on lower part of grain |
| 5390476 | bacterial panicle blight | Burkholderia glumae | Rice head with symptoms of Bacterial panicle blight infection on the grain. |
| 5390479 | gray leaf spot | Magnaporthe grisea | Rice flag leaf collars symptomatic of infection with the rice blast pathogen |
| 5390480 | gray leaf spot | Magnaporthe grisea | Ten day old colony on rice leaf agar. |
| 5390481 | gray leaf spot | Magnaporthe grisea | Rice stem nodes symptomatic of infection with rice blast pathogen |
| 5390482 | gray leaf spot | Magnaporthe grisea | spores from a leaf blast lesion |
| 5390484 | sheath spot of rice | Rhizoctonia oryzae | Rice leaf sheath with symptoms of sheath spot infection |
| 5390485 | brown spot of rice | Cochliobolus miyabeanus | Rice leaf with brown spot infection |
| 5390487 | zinc deficiency | Bronzing symptoms of zinc deficiency on rice leaf. | |
| 5390488 | sheath spot of rice | Rhizoctonia oryzae | A rice leaf sheath with symptoms of sheath spot infection |
| 5390489 | brown spot of rice | Cochliobolus miyabeanus | Close-up view of rice leaf with brown spot infection |
| 5390490 | brown spot of rice | Cochliobolus miyabeanus | Rice leaf showing severe brown spot leaf symptoms |
| 5390491 | brown spot of rice | Cochliobolus miyabeanus | Rice leaf with brown spot infection symptoms |
| 5390492 | Narrow brown leaf spot | Cercospora janseana | Rice leaf sheath showing discolored veins typical symptom of Cercospora net blotch (Narrow Brown leaf spot) |
| 5390493 | Narrow brown leaf spot | Cercospora janseana | Rice flag leaf sheath infection showing Cercospora sheath rot (Narrow Brown leaf spot) symptoms |
| 5390494 | cold injury (low temperature) | Soil level white bands due to cold damage on rice seedlings | |
| 5390496 | bacteria wilt and soft rot | Dickeya chrysanthemi | Foot rot symptoms of bacterial infection of crown |
| 5390504 | rice | Oryza sativa | Flooding rice field showing movement of water from low to high areas of the field |
| 5390505 | kernel smut | Tilletia barclayana | Kernel smut spores from grain |
| 5390506 | kernel smut | Tilletia barclayana | Kernel smut infected rice showing spores oozing from grain |
| 5390507 | kernel smut | Tilletia barclayana | Comparison of kernel smut infected and healthy brown rice |
| 5390508 | rice | Oryza sativa | Using laser as a reference to level rice field with a soil bucket |
| 5390509 | gray leaf spot | Magnaporthe grisea | Screening for leaf blast resistance in an upland nursery showing dead susceptible plants to undamaged resistant plant symptoms |
| 5390510 | gray leaf spot | Magnaporthe grisea | Rice leaves showing symptoms of leaf blast |
| 5390500 | false smut | Ustilaginoidea virens | Rice grain replaced by the false smut fungal spores and sclerotia |
| 5390501 | false smut | Ustilaginoidea virens | False smut spores from infect rice grain |
| 5390502 | false smut | Ustilaginoidea virens | Seedhead of rice showing symptoms and signs of infection with false smut (Ustilaginoidea virens). |
| 5390513 | leaf scald | Monographella albescens | Rice leaf with chevron leaf scald symptoms |
| 5390514 | leaf smut of rice | Entyloma oryzae | Rice leaves showing signs and symptoms of infection with leaf smut |
| 5390515 | leaf smut of rice | Entyloma oryzae | Rice leaves showing signs and symptoms of infection with leaf smut. Note desiccation on leaf tips. |
| 5390524 | rice | Oryza sativa | Rice pollination showing emerged anthers |
| 5390525 | rice | Oryza sativa | Rice field drain showing movable insert to adjust water level |
| 5390526 | rice | Oryza sativa | Rice seed treated with fungicide |
| 5390527 | rice | Oryza sativa | Rice seeds or grain untreated |
| 5390528 | rice | Oryza sativa | Rice stubble at end of season often infested with many overwintering pathogens |
| 5390518 | gray leaf spot | Magnaporthe grisea | Rice heads showing symptoms of rotten neck, neck, and collar blast infection |
| 5390519 | gray leaf spot | Magnaporthe grisea | Rice nodes with symptoms of blast infection |
| 5390520 | gray leaf spot | Magnaporthe grisea | Rice head showing symptoms of panicle blast infections |
| 5390521 | straight head | Curved deformed palea and lemma of rice grain | |
| 5390530 | root-knot nematode | Meloidogyne spp. | Roots showing symptoms of infection with root knot nematode |
| 5390531 | sea salt | Symptoms of excess salt on seedling rice plants resulting from water moved in by hurricane | |
| 5390536 | sheath rot of rice | Sarocladium oryzae | Severe sheath and grain symptoms due to sheath rot |
| 5390537 | stem rot of rice | Sclerotium oryzae | Severe rice sheath infection symptoms of stem rot |
| 5390548 | sheath blotch of rice | Pyrenochaeta oryzae | Sheath blotch symptoms on rice leaf sheath |
| 5390549 | sheath rot of rice | Sarocladium oryzae | Rice flag leaf sheath and head infection symptoms of sheath rot |
| 5390550 | sheath rot of rice | Sarocladium oryzae | Rice sheath infection symptoms of sheath rot |
| 5390551 | Alternaria leaf spot | Alternaria padwickii | Rice leaves with stack burn (Alternaria leaf spot) symptoms |
| 5390552 | Alternaria leaf spot | Alternaria padwickii | Rice leaves with stack burn (Alternaria leaf spot) symptoms |
| 5390553 | stem rot of rice | Sclerotium oryzae | Rice stubble sheath showing sclerotia imbedded in tissues |
| 5390555 | stem rot of rice | Sclerotium oryzae | Rice leaf sheath showing symptoms of Stem rot |
| 5390557 | straight head | Upright rice head in filed due to straight head disorder | |
| 5390558 | straight head | Curved palea and lemma symptoms of rice grain due to the straight head disorder | |
| 5390559 | straight head | Curved palea and lemma symptoms on rice grain called parrot beak due to the straight head disorder | |
| 5390560 | rice | Oryza sativa | Flooding rice field from underground irrigation system |
| 5390561 | rice | Oryza sativa | Using water in a flooded rice field as a level indicator to fill low areas and cut off high areas |
| 5390565 | White Leaf Streak of Rice | Mycovellosiella oryzae | White leaf streak symptoms on rice leaves |
| 5390566 | rice white tip nematode | Aphelenchoides besseyi | Rice leaves showing symptoms of damage caused by white tip nematode |
| 5390567 | rice white tip nematode | Aphelenchoides besseyi | Rice leaves showing symptoms of damage caused by white tip nematode |
