Diseases

Alternaria Fruit Rot

Alternaria spp.

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…

Anthracnose

Colletotrichum acutatum.

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…

Armillaria Root Rot

Armillaria spp.

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…

Bacterial Blight

Pseudomonas syringae pv syringae

Symptoms appear from bud break to bloom. Brownish-black discoloration appears on one-year-old stems, often near branch tips. Buds and flower clusters within or adjacent to the infected stem…

Blueberry Leaf Rust

Naohidemyces vaccinia

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.

Botrytis Blight and Fruit Rot

Botrytis cinerea

Infected twigs turn silvery and brittle. Infected flowers wilt, turn brown and develop a grey fuzzy mould on the surface. Green berries develop small, soft, purple patches. Ripe…

Crown Gall

Agrobacterium tumefaciens

Hard, tumour-like growths are present on the roots, crown, or stems. Individual branches or entire plant may be killed.

Godronia Canker

Godronia cassandrae ( Fusicoccum putrefaciens).

Mites

Tetranychus urticae

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;…

Mummy Berry

Monilinia vaccinii-corymbosi

Individual leaf and flower clusters turn brown and droop. A bluish-grey fuzz is visible on the petiole or flower stem. Infected berries become pink and puckered, then turn…

Phomopsis Canker

Phomopsis vaccinii).

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.

Root and Crown Rot

Phytophthora cinnamomi).

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…

Silver Leaf

Chondrostereum purpureum).

Leaves have a silvery appearance. Infected branches have a brown discoloration in the heartwood. Infected plants die within 1-3 years.

Sooty Blotch

Unidentified causal agent

Grey to black blotches form on the surface of green stems and twigs, giving them a sooty appearance.