Apple rust . o m w o. 16 W. Va. Agrl. Experiment Station [Bul. 154] PLATE III. Fig. 1—Mature rust spots on apple leaf. Lower surface view. (Re-duced.) Pig. 2—Young aeciosori. Taken 64 days after inoculation. (X 5). Fig. 3—Mature aeciosori. They are open and many of the aeciosporesare gone. (X ). Fig. 4—Aeciospores. (X 240). Fig. 5—Cedar twig with numerous galls of various sizes. leaf surface. During the months of July and August bodiesknown as cluster cups, which bear the aeciospores, breakthrough these swellings. (Plate III, fig. 2.) The aeciosporesof this fungus are not capable of produc
Apple rust . o m w o. 16 W. Va. Agrl. Experiment Station [Bul. 154] PLATE III. Fig. 1—Mature rust spots on apple leaf. Lower surface view. (Re-duced.) Pig. 2—Young aeciosori. Taken 64 days after inoculation. (X 5). Fig. 3—Mature aeciosori. They are open and many of the aeciosporesare gone. (X ). Fig. 4—Aeciospores. (X 240). Fig. 5—Cedar twig with numerous galls of various sizes. leaf surface. During the months of July and August bodiesknown as cluster cups, which bear the aeciospores, breakthrough these swellings. (Plate III, fig. 2.) The aeciosporesof this fungus are not capable of producing reinfection of theapple, but may be carried back to the cedar where they lodgein the axils of the tiny leaf scales, producing an infection inthe young growth of the cedar. No outward indication ofsuch cedar infection can be observed until the followingseason. CONDITIONS INFLUENCING INFECTIONOF APPLE. It was believed that a more definite knowledge of theconditions which bring about rust infection of the a
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Keywords: ., bookcentury1900, bookdecade1910, bookidapplerust154, bookyear1915
