Plant Disease Management Handbook

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Blackberry (Rubus spp.) - Virus Diseases

Raspberry (Rubus spp.) - Crumbly Fruit

Confirmed to have RBDV and notice the poorly formed fruit.

Neil Bell, 2010.

Tomato ringspot virus symptoms in ‘Willamette’ red raspberry.

Bob Martin.

Cause Verticillium dahliae, a fungus that has been reported in the PNW. The disease is particularly serious in black raspberry. It also attacks red raspberry but rarely. It is more often in 'Loganberry' and 'Youngberry' than in the 'Marion' and 'Evergreen' trailing berries. The fungus may live saprophytically in soil many years but can attack susceptible plant roots whenever they are placed in infested ground.

Black raspberry plants with veriticillium wilt showing dead floralcanes, wilting primocanes and poor growth overall.

Jay W. Pscheidt, 2008.

Dead black-cap floral canes in the center of this plant.

Jay W. Pscheidt, 2008.

Note how the dead and dying plants in the foreground form a circular pattern in the field. Previous crop was peppermint.

Jay W. Pscheidt, 2008.

Verticillium symptoms on primocane fruiting raspberry growing in eastern Washington.

Lisa Jones, 2017.

Image related to Raspberry (Rubus spp.)-Verticillium Wilt

When the outer bark is stripped away you may see a bluish stripe or ribbons of infected tissue.

Part of OSU Extension Plant Pathology Slide Set.

See:

Raspberry Cultivar Susceptibility

Image related to Raspberry (Rubus spp.)-Spur Blight

During the winter, infected canes turn gray.

Photo by Ralph S. Byther

The fungus has grown into the cane tissue around the bud, producing a brown-purple diseased area.

OSU Extension Plant Pathology Slide Set, 1981.

Melodie Putnam, 2010.

See:

Raspberry Cultivar Susceptibility

Floricane fruiting raspberry collapsing from root rot.

Lisa Jones, 2017.

Image related to Raspberry (Rubus spp.)-Root Rot

Dieback and crown rot due to Phytophthora sp.

OSU Plant Clinic Collection, 2011.

Root systems are very reduced once Phytophthora gets established.

OSU Plant Clinic collection, 2012.

Young primocanes with root rot showing chlorosis, marginal leaf burn and wilting.

Jay W. Pscheidt, 2018.

See:

Raspberry (Rubus spp.) - Nematode, Dagger

Raspberry Cultivar Susceptibility

Note the yellowed, puckered areas of these leaves.

OSU Extension Plant Pathology Slide Collection, 1953.

Image related to Raspberry (Rubus spp.)-Ringspot

Note the many ringspots on these leaves.

OSU Extension Plant Pathology Slide Set, 1958.

More ringspots.

OSU Extension Plant Pathology Slide Set, 1996.

The entire plant can have problems, not just leaves.

OSU Extension Plant Pathology Slide Set, 1996.

Field of ‘Willamette’ red raspberry with high incidence of Tomato ringspot virus (note missing plants in each row).

Bob Martin.

Tomato ringspot virus symptoms in ‘Willamette’ red raspberry.

Bob Martin.

See:

Raspberry Cultivar Susceptibility

Image related to Raspberry (Rubus spp.)-Pseudomonas Blight

The canker on this primocane is due to Pseudomonas.

Melodie Putnam, 2007.

Affected laterals show a characteristic downward bend.

OSU Extension Plant Pathology Slide collection, 1970.

Shoots of 'Cascade Delight' raspberry collapsing from bacterial blight.

OSU Plant Clinic Collection, 2011.

See:

Raspberry Cultivar Susceptibility

Floricane leaf with heavy powdery mildew infection.

Lisa Jones, 2017.

Image related to Raspberry (Rubus spp.)-Powdery Mildew

Infected fruit become covered with a white, mealy mat of fungus, fail to size, wither and die.

OSU Plant Clinic Image, 2013.

New shoot tip of 'Wakefield' has become infected with powdery mildew.

Lisa Jones, 2015.

Flag shoot covered with powdery mildew from bud infection the previous year.

Lisa Jones, 2017.

Note the lower row of berries are smaller with a dull appearance.

Photo by Edward K. Vaughan, 1957.

See:

Blackberry (Rubus spp.) - Orange Rust

Note: Red raspberry is resistant while black raspberry is susceptible.

Cause The root-lesion nematode Pratylenchus penetrans is a migratory endoparasite where part of the population is in soil and part in the roots at all times. Populations in raspberry generally are low through winter and spring, increase rapidly through the summer, and decline in fall. Densities at or below detectable levels at planting can increase to damaging levels by the sixth-to-eighth year. Other species of this nematode do not cause significant root damage.

Image related to Raspberry (Rubus spp.)-Nematode, Root-lesion

The reddish long structures are the stained bodies of the nematodes in this raspberry root.

OSU Extension Plant Pathology Slide Set.

See:

Raspberry (Rubus spp.) - Ringspot