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Figure

Development of primary apple scab spores and infection of plant parts in spring: (a) scab lesions on overwintering leaf; (b) mature pseudothecia on leaf surface ready to release primary spores (enlarged); (c) primary spore (enlarged); (d) susceptible plant parts; and (e) primary spore germinating and penetrating leaf or fruit cuticle (enlarged).

Illustration by David Kidd.

Statewide IPM Program, Agriculture and Natural Resources, University of California
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