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Virus Not In BC

Blueberry Leaf Mottle

(Blueberry leaf mottle virus – BLMV)
Damage: Leaves are mottled and may be malformed or strap-like. The top of bushes die back with weak regrowth occurring only at the crown.
Disease: BLMV is spread by pollen and carried by bees. It is present in Michigan.
blmv

 

Blueberry Red Ringspot

(Blueberry red ringspot virus – BRRV)
Damage: Circular red rings or blotches, 4-6 mm in diameter, develop on one-year-old and older stems. Older leaves develop reddish brown circular spots, 3-5 mm in diameter, in mid to late summer.
Disease: The disease is caused by BRRV and it is not known how it spreads. It is present at low incidence in Oregon and the Eastern US. ‘Bluecrop’ is resistant to this disease.
brrv

 

Blueberry Shoestring

(Blueberry shoestring virus – BSSV)
Damage: New and one-year-old stems show red streaks, 3-20 mm long, more on the side of the stem exposed to the sun. Leaves are elongated and strap-like (shoestring appearance), and may be reddish in colour. Blossoms have reddish streaks. Berries are reddish purple instead of blue. Yield is reduced.
Disease: BSSV is spread by the blueberry aphid, Illinoia pepperii, which is not present in BC. The virus has a latency period of 4 years before infected bushes show symptoms.
bssv

 

Blueberry Stunt

Damage: Bushes are severely stunted and bushy. Leaves may be spoon-shaped or cupped downward with chlorotic margins and chlorosis between the veins. Chlorotic areas turn bright red in late summer. Yield is reduced.
Disease: This disease is caused by a phytoplasma and is spread by leafhoppers. It is present in Eastern Canada and the Eastern US.
blueberry-stunt

 

Necrotic Ringspot

(Tobacco ringspot virus – TRSV)
Damage: Symptoms vary among cultivars. Leaves may be small, misshapen, crinkled and have small necrotic spots, 2-5 mm in diameter. Young twigs may have small brown necrotic patches. Yield is reduced. Symptoms are similar to those of ToRSV.
Disease: TRSV is spread by dagger nematodes (Xiphinema spp.) from infected to healthy roots in the soil. It causes plant decline in Oregon and the Eastern US.

 

Tomato Ringspot

(Tomato ringspot virus – ToRSV)
Damage: Leaves are cupped and misshapen or elongated and have pale yellow or brown circular spots of 2-5 mm in diameter. Stems may have brown, circular spots of 2-5 mm in diameter. Some shoots may appear normal, others may have misshapen leaves. An infected bush can be completely defoliated.
Disease: ToRSV is spread by dagger nematodes (Xiphinema spp.) from infected to healthy roots in the soil. The virus spreads slowly, causing plant decline in expanding circular patches in the field. It is present in Washington, Oregon and Michigan. It has been detected in BC on raspberries but not on blueberries.

Premature Fruit Drop

Premature Fruit Drop

Damage: Flowers and leaves have red streaking during bloom. Berries begin to develop, reach 3-5 mm in size and then prematurely turn blue and drop. Infected bushes stand taller than neighbouring bushes as they have no fruit. Symptoms have only been noted on Bluecrop.
Disease: The causal agent of this disease is not well understood.

Premature Fruit DropRobert Martin, USDA-ARS

Premature Fruit Drop Leaf ReddeningRobert Martin, USDA-ARS

Premature Fruit DropRobert Martin, USDA-ARS

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Unhealthy vs Healthy BushRobert Martin, USDA-ARS

Premature Fruit Drop Height DifferencesRobert Martin, USDA-ARS

Blueberry Shock Virus (BIShV)

Blueberry Shock

Blueberry shock virus BIShV
Damage: Flowers and/or leaves blight and die, while stems remain green. Yield is reduced. Symptoms are nearly identical to Blueberry scorch, but blighting may occur slightly earlier. Symptoms appear at blossom and remain visible from spring to mid-summer.
Disease: BIShV is spread by pollen. Infected bushes will recover in 1-4 years, but will remain infected with the virus. This virus will slowly spread through an entire field.

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Blueberry Shock VirusCarolyn Teasdale, ES Cropconsult

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Blueberry Shock VirusCarolyn Teasdale, ES Cropconsult

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Blueberry Shock VirusCarolyn Teasdale, ES Cropconsult

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Blueberry Shock Virus

Blueberry Scorch Virus (BIScV)

Blueberry Scorch

Blueberry scorch virus BIScV
Damage: Flowers and/or leaves blight and die, while stems remain green. Yield is reduced. Some varieties, like Bluecrop, may not show blighting but leaves may turn slightly yellow and yields will be reduced. Symptoms appear at blossom and remain visible from spring to mid-summer.
Disease: BIScV is spread by aphids and infected propagating plant materials. The virus can spread rapidly in the field. Bushes infected with this disease will never recover.

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Blueberry Scorch VirusCarolyn Teasdale, ES Cropconsult

scorch2

Blueberry Scorch VirusCarolyn Teasdale, ES Cropconsult

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Blueberry Scorch VirusCarolyn Teasdale, ES Cropconsult

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Blueberry Scorch VirusCarolyn Teasdale, ES Cropconsult

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Blueberry Scorch VirusCarolyn Teasdale, ES Cropconsult

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Blueberry Scorch VirusCarolyn Teasdale, ES Cropconsult

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Blueberry Scorch VirusCarolyn Teasdale, ES Cropconsult

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Blueberry Scorch VirusCarolyn Teasdale, ES Cropconsult

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Blueberry Scorch VirusCarolyn Teasdale, ES Cropconsult

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Blueberry Scorch VirusKarina Sakalauskas, BCBC

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Blueberry Scorch VirusKarina Sakalauskas, BCBC

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Blueberry Scorch VirusCarolyn Teasdale, ES Cropconsult

 

Blueberry Scorch Fact Sheet English

 

Blueberry Scorch Fact Sheet Punjabi

 

Blueberry Mosaic

Blueberry Mosaic

Damage: Leaves are brightly coloured with red, yellow and green mottling. One or more branches may show symptoms on a bush. Yield is reduced, and berries are of poor quality.
Disease: The cause of the disease is not well understood.

Blueberry Mosaic

Blueberry Mosaic

Blueberry Mosaic

Blueberry Mosaic

Phomopsis Canker

Phomopsis Canker

(Phomopsis vaccinii).
Damage: Individual branches turn reddish-brown, called “flagging”, and die, and leaves may fall soon after Large (5-15 cm), reddish brown, oval-shaped lesions can be seen on 1-3 year-old stems.
Disease cycle: This fungus over- winters on cankers on stems. Spores are released from cankers during periods of rainy weather and splash onto adjacent stems mostly in the spring. Lesions may take 1-3 year to fully girdle and kill individual branches.

Phomopsis Stem Canker On DraperSiva Sabaratnam, BCAGRI

Armillaria Root Rot

Armillaria Root Rot.

(Armillaria spp.)
Damage: Infected bushes have small, pale leaves and die within 1-2 years. At the late stages of disease, entire foliage turn brown. Root-like fungal growth (called rhizomorphs),dark brown to black when matured or pale white when young, can be found attached to roots or crown or under the bark. White fungal mats can be seen on the stem underneath the bark when scraped away at the crown just below or at the soil line.
Disease cycle: This fungal disease is common on trees and woody species, and may attack blueberries planted on recently cleared of forest land. Wood bark and other woody plant materials used as planting medium for blueberry propagation or as mulch in the field may harbour the fungus.

Armilaria Root RotSiva Sabaratnam, BCAGRI

Armilaria Root RotSiva Sabaratnam, BCAGRI

Armilaria Root RotSiva Sabaratnam, BCAGRI

Armilaria Infected CrownSiva Sabaratnam, BCAGRI

Armillaria RhizomorphsSiva Sabaratnam, BCAGRI

Rhizomorph Of Armilaria On Infected CrownSiva Sabaratnam, BCAGRI

Sooty Blotch

Sooty Blotch

Unidentified causal agent
Damage: Grey to black blotches form on the surface of green stems and twigs, giving them a sooty appearance.
Disease cycle: The organism grows below the cuticle on plant surfaces. It does not appear to harm the plant.

Sooty BlotchCarolyn Teasdale, ES Cropconsult

Silver Leaf

Silver Leaf

(Chondrostereum purpureum).
Symptoms: Leaves have a silvery appearance. Infected branches have a brown discoloration in the heartwood. Infected plants die within 1-3 years.
Disease cycle: Growth of bracket-like fungus, 5-7 cm wide, emerges from dead branches and pruning wounds at plant base and releases spores. Spores are spread by wind and rain during spring and winter. It can also spread by transplants generated from stem cuttings of infected plants.

Silver Leaf On Phomopsis Infected Draper PlantSiva Sabaratnam, BCAGRI

Silver Leaf DraperSiva Sabaratnam, BCAGRI

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Silver Leaf DukeSiva Sabaratnam, BCAGRI

Root and Crown Rot

Root and Crown Rot

(Phytophthora cinnamomi).
Damage: Patches of bushes in a field look weak, have small yellow leaves, and few blossoms or berries. Infection often occurs in low areas of the field with poor drainage. Roots are soft and brown, may lack feeder roots.
Disease cycle: This fungus-like organism thrives in warm, wet soils.

Root RotSiva Sabaratnam, BCAGRI

Root Rot DeclineSiva Sabaratnam, BCAGRI