Pacific Northwest Plant Disease Management Handbook

Pacific Northwest Plant Disease Management Handbook

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Apple. Cause These diseases are caused by Apple scar skin viroid. Many infected cultivars do not express symptoms of disease. It has become a problem ... after long-term regular air storage. Lenticel ... The tissue appears water-soaked , glassy and may become hard. Later there may be ... In severe cases, a dark necrotic line will appear at the graft union flanked by spongy orange tissue. Cultural controlanbsp;...

Title:Pacific Northwest Plant Disease Management Handbook
Author: Jay W. Pscheidt, Cynthia M. Ocamb
Publisher: - 2009

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