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Overview of Blueberry Diseases

Pacific Northwest blueberry growers must identify and control a number of different fungal, bacterial, and viral diseases as well as nematodes in order to ensure the highest yields possible (profitable yields). Fortunately, only a few of the diseases which occur on highbush blueberry in this region cause significant losses when left unchecked (Table 1). For a complete guide, please click hereGet Adobe Acrobat Reader.

Table 1. Relative importance of diseases of highbush blueberry
in the Pacific Northwest

Disease Causal Agent Relative
Importance (1)
Canker Pseudomonas spp. 3
Crown Gall Agrobacterium tumefaciens 1
Anthracnose Colletotrichum gloeosporioides 2
Armillaria root rot Armillaria mellea 1
Botrytis blight Botrytis cinerea 4
Double Spot Dothichiza caroliniana 1
Godronia canker Godronia cassandre 3
Leaf rust Pucciniastrum vaccinii 1
Mummy berry Monilinia vaccinii-corymbosi 4
Phytophthora root rot Phytophthoraspp. 2
Powdery Mildew Microsphaera alni 1
Sooty Mold Several fungi 1
Stem canker Botryosphaeria corticis 1
Twig blight Phomopsis vaccinii 1%3