| 5430064 |
southern blight |
Sclerotium rolfsii |
Infected lower stem showing white, mycelial fan and mustard seed-sized sclerotia. |
| 5430065 |
southern blight |
Sclerotium rolfsii |
Infected lower stem showing mustard seed-sized sclerotia. |
| 5430066 |
southern blight |
Sclerotium rolfsii |
Infected lower stem showing close-up of mustard seed-sized sclerotia. |
| 5368683 |
Verticillium wilts |
Verticillium spp. |
Culture of a species of the fungus Verticillium taken from discolored xylem tissue on Acid potato dextrose agar (APDA). Isolated from red maple (Acer rubrum). |
| 5368586 |
Dutch elm disease |
Ophiostoma ulmi |
Characteristic asexual stage or "synnemata", conidiophores protruding from the end of an infected branch. |
| 5368587 |
Dutch elm disease |
Ophiostoma ulmi |
Characteristic asexual stage or "synnemata", conidiophores protruding from the end of an infected branch. |
| 5368588 |
Dutch elm disease |
Ophiostoma ulmi |
Characteristic asexual stage or "synnemata", conidiophores protruding from the end of an infected branch. |
| 5368589 |
Dutch elm disease |
Ophiostoma ulmi |
Characteristic asexual stage or "synnemata", conidiophores protruding from the end of an infected branch. |
| 5368351 |
gummy stem blight (vine decline) |
Didymella bryoniae |
Stained, asexual spores of the fungal anamorph, Phoma cucurbitacearum. |
| 5368651 |
Fusarium wilt |
Fusarium oxysporum f.sp. nicotianae |
A one-sided yellowing when looking at the whole plant, an individual leaf, or both. Vascular disoloration is also seen. Variety KT 204. |
| 5368652 |
Fusarium wilt |
Fusarium oxysporum f.sp. nicotianae |
A one-sided yellowing when looking at the whole plant, an individual leaf, or both. Vascular disoloration is also seen. Variety KT 204. |
| 5368653 |
Fusarium wilt |
Fusarium oxysporum f.sp. nicotianae |
A one-sided yellowing when looking at the whole plant, an individual leaf, or both. Vascular disoloration is also seen. Variety KT 204. |
| 5368654 |
Fusarium wilt |
Fusarium oxysporum f.sp. nicotianae |
A one-sided yellowing when looking at the whole plant, an individual leaf, or both. Vascular disoloration is also seen. Variety KT 204. |
| 5368684 |
Verticillium wilts |
Verticillium spp. |
Cross and tangential sections of the lower trunk of one of the nursery trees showing characteristic olive green color of Verticillium-infected xylem. |
| 5368685 |
Verticillium wilts |
Verticillium spp. |
Trunk section with outer tissue cut away to reveal characteristic olive green color of Verticillium-infected xylem. |
| 5368681 |
Verticillium wilts |
Verticillium spp. |
Lower portion of trunk with outer tissue stripped off to reveal discolored xylem tissue. |
| 5368682 |
Verticillium wilts |
Verticillium spp. |
Trunk portion near ground level with outer tissue cut away to reveal discolored xylem tissue. |
| 5368707 |
Dutch elm disease |
Ophiostoma ulmi |
Characteristic asexual stage or "synnemata", conidiophores with clusters of colorless conidia at the top. |
| 5368708 |
Dutch elm disease |
Ophiostoma ulmi |
Characteristic asexual stage or "synnemata", conidiophores with clusters of colorless conidia at the top. |
| 5368709 |
Dutch elm disease |
Ophiostoma ulmi |
Incubation of symptomatic pieces of elm branches, surface sterilized and placed in an incubation chamber. |
| 5368710 |
Dutch elm disease |
Ophiostoma ulmi |
Tree limbs and leaves shown symptoms of dieback. |
| 5368857 |
gummy stem blight (vine decline) |
Didymella bryoniae |
Dark brown leaf spots often with concentric rings. |
| 5368858 |
gummy stem blight (vine decline) |
Didymella bryoniae |
Close-up of leaf spots with concentric rings. |
| 5368859 |
gummy stem blight (vine decline) |
Didymella bryoniae |
Close-up of leaf spots with concentric rings. Spots often occur along margins of leaves. |
| 5368860 |
gummy stem blight (vine decline) |
Didymella bryoniae |
Earlier stage of leaf spot development before all infected tissue turns dark brown. |
| 5368887 |
gummy stem blight (vine decline) |
Didymella bryoniae |
Asexual spore-producing structures "pycnidia" with spores oozing out, seen in infected tissue. |
| 5369017 |
gummy stem blight (vine decline) |
Didymella bryoniae |
Conidia enbedded in infected leaf tissue under darkfield observation. |
| 5369018 |
gummy stem blight (vine decline) |
Didymella bryoniae |
Asexual spores of the fungal anamorph, Phoma cucurbitacearum. |
| 5369019 |
gummy stem blight (vine decline) |
Didymella bryoniae |
Dark brown leaf spots often with concentric rings. |
| 5369020 |
gummy stem blight (vine decline) |
Didymella bryoniae |
Close-up of dark brown leaf spot with concentric rings.
|
| 5369062 |
southern blight |
Sclerotium rolfsii |
Infected roots and lower stem showing tan, mustard seed-sized sclerotia. |
| 5369063 |
southern blight |
Sclerotium rolfsii |
Infected roots and lower stem showing mycelial fan at the upper edge of infection. |
