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Black Rot (Guignardia bidwellii): Pycnidia over-winter
in fruit
mummies/rotted berries and cane lesions and
released by spring rain
after budbreak. Leaf lesions
develop 3-5 days after infection. Mature leaves and
ripe fruits (8 weeks after bloom) are resistant to infection.
Rainfall
required for release of spores. Data as of
7:30 am on 8/13/07
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