(Naohidemyces vaccinia)
Symptoms: Appear in late summer. Brown spots on the upper surface of leaves. Powdery orange-yellow pustules on the underside of leaves. May caused early defoliation.
Disease cycle: In northern climates, Blueberry leaf rust uses hemlock as its alternative host. With the Fraser Valley’s warm climate, the disease might not need hemlock to complete its life cycle.
Blueberry Leaf Rust
Blueberry Leaf Rust
Blueberry Leaf Rust
(Colletotrichum acutatum.)
Symptoms: Symptoms appear on ripe and overripe berries. Ripe berries develop a soft, sunken area near the calyx (flower-end) of the berry. Masses of orange spores are visible on the sunken areas of the berry.
Disease: This fungus over- winters on live twigs, flower buds, dead twigs and debris on the ground. Spores are released during warm, wet weather, and spread by splashing rain onto blossoms and green berries. Infections on young berries remain latent until fruit ripening.
Anthracnose Fruit Rot Carolyn Teasdale, ES Cropconsult
Anthracnose Fruit Rot Carolyn Teasdale, ES Cropconsult
Anthracnose Fruit Rot Carolyn Teasdale, ES Cropconsult
Anthracnose Fruit Rot Carolyn Teasdale, ES Cropconsult
Anthracnose Fruit Rot Carolyn Teasdale, ES Cropconsult
Anthracnose Fruit Rot Carolyn Teasdale, ES Cropconsult
(Alternaria spp.)
Symptoms: Leaf spot symptoms appear from March to May. Leaf spots are 1-5 mm wide, grey with a red margin. Fruit rot symptoms appear during fruit ripening. Infected berries become soft and develop a greenish-black mould on the surface.
Disease cycle: This fungus over-winters on twigs of dead branches and debris on the ground. Spores are released during cool, wet weather and are carried by the wind.
Alternaria Fruit Rot Carolyn Teasdale, ES Cropconsult
Alternaria Fruit Rot Carolyn Teasdale, ES Cropconsult
Alternaria Fruit Rot Carolyn Teasdale, ES Cropconsult
Alternaria Leaf Spot and Fruit Rot Carolyn Teasdale, ES Cropconsult
(Tetranychus urticae) Damage: Spider mites feed on the underside of the leaves, and can be found on older leaves as well as near the shoot tips. Lightly infested leaves become speckled; heavily infested leaves become bronzed and covered with webbing. Spider mites are a sporadic pest in blueberries and are rarely seen in most fields. Mite populations build up during the heat of summer, and can be more prevalent in hot dry locations. Mites can reside on weeds within blueberry fields. Pest: Two-Spotted Spotted spider mites are yellowish-greenish with two dark spots on the back. They vary in size from near microscopic to clearly visible. These mites overwinter as orange females in the soil near the plant.
Spider Mites On Blueberry LeafCarolyn Teasdale, ES Cropconsult
Spider Mites and Eggs On Blueberry LeafCarolyn Teasdale, ES Cropconsult
Spider Mite DamageCarolyn Teasdale, ES Cropconsult
Spider Mites DamageCarolyn Teasdale, ES Cropconsult