Plant Disease Management Handbook

Cause The fungus Botrytis sp. has been reported in Washington and found by the OSU Plant Clinic. Alternaria alternata has been a problem on ripe fruit in California. Rain or dew when figs are ripening will result in surface spotting. These spots are up to 0.2 inch in diameter, are light-brown to-black in color, sunken, and distributed over the entire surface of the fruit.

Fruit infected by Botrytis can be seen here to wilt and collapse along with the production of a mass of buff-colored spores at the bottom of the fruit.

Neil Bell, 2020.

As fall rains return, many different fungi can colonize ripe fruit.

Jay W. Pscheidt, 2020.

Cause There are numerous leaf spots on Sambucus sp. but only a few have been reported in the PNW including Cercosporella prolificans and Septoria sambucina. A Ramularia sp. has been found by the OSU Plant Disease Clinic. Fungal leaf spots are generally encouraged by wet, rainy weather that keeps foliage wet for long periods of time. Most overwinter in plant debris.

Septoria leaf spots on elderberry.

Jay W. Pscheidt, 2022.

Septoria leaf spots on elderberry.

Jay W. Pscheidt, 2022.

Septoria leaf spots on elderberry.

Jay W. Pscheidt, 2022.

Large necrotic leaf spots with yellow halos that were not specifically identified.

2020.

Cause Daphne-infecting viruses such as cycas necrotic stunt virus (CNSV, Nepovirus) which was prevalent in Korea, carnation mottle virus (CaMoV, Carmovirus) has been found by the OSU Plant Clinic, cucumber mosaic virus (CMV, Cucumovirus), daphne virus S (DVS, Carlavirus), daphne virus X (DVX, Potexvirus), daphne virus Y (DVY, Potyvirus), daphne mosaic virus (DapMV, Potyvirus), a tobamovirus, alfalfa mosaic virus, arabis mosaic virus, tobacco ringspot virus, and some other poorly characterized rod-shaped or isometric viruses have been repo

Chlorotic spots and mosaic symptoms have been observed on Daphne in Oregon.

Daphne with distorted (wrinkled) leaves and mosaic symptoms have been observed in Oregon.

See:

Rhododendron - Cutting Rots

Note Both Fusarium and Rhizoctonia have been cultured by the OSU Plant Clinic from rotting Daphne cuttings that failed to root.

Cuttings of Daphne 'Carol Mackie' that failed to root. Fusarium was found from the discolored stems to the right side of this image.

Oregon State University Plant Clinic image, 2006.

See:

Greenhouse Plants, Ornamental - Black Root Rot

Note Out of dozens of samples there have been 6 that were diagnosed with black root rot by the OSU Plant Clinic.

Cause The fungi Septoria chrysanthemi has been reported from Washington and S. leucanthemi has been reported from Oregon and Washington. These fungi generally overwinter in plant debris and are favored by conditions that keep leaves wet for extended periods of time.

See:

Cherry (Prunus spp.) - Little Cherry

Cherry (Prunus spp.) - Rasp Leaf

Several virus symptoms on one tree. Ringspots on the left side, vein clearing in the center (yellow rather than green leaf veins) and in the bottom right you can see a leaf with a line pattern (wavy or zig-zag line across the leaf blade).

Jay W. Pscheidt, 2020.

Line pattern and ringspots on Prunus serrulata 'Kwanzan' due to Prunus necrotic ringspot virus (PNRSV).

Photo by Melodie Putnam, 1997.

Oak leaf pattern symptom on Prunus serrulata 'Amanagowna' with unidentified virus.

Zeller and Milbrath, 1940.

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Fir, True (Abies spp.) - Drought Injury

Western Red Cedar on a sandy site showing mortality due to drought.

David Shaw, 2016.

Mortality of Western red cedar due to drought.

David Shaw, 2016.

Cause The fungus Postia amara caused an important stem decay of incense-cedar in Oregon. Airborne spores infect, through open wounds such as those from fire, large open knots, or broken branch stubs. Trees are particularly susceptible when growing in ravines or other locations favoring surface moisture on exposed heartwood for extended periods of time. Fruiting bodies called conks indicate extensive decay columns. Mostly a problem of older trees.

See:

Camellia - Variegation