Figure 4. The underside of a grapevine leaf showing the typical “down”. These are the sporangia of the pathogen. This down develops in moist conditions in the dark. (Courtesy G. Ash)
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Figure 4. The underside of a grapevine leaf showing the typical “down”. These are the sporangia of the pathogen. This down develops in moist conditions in the dark. (Courtesy G. Ash) BACK |