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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)
Bacterial
Canker Pseudomonas spp. 3
Crown Gall Agrobacterium tumefaciens 1
Fungal
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