. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. SHADE TREES. 195 Schw.) grows in the secretions of woolly aphis, causing a large spongy black mass on the leaves. Hawthorne {Cratcvyus). â The leaves of the English hawthorne are affected often seriously with Entomosporium thumenii Cke., which produces spots. Ash {Fraxinus). â The stems and leaves of the ash for the past few years have been troubled v/ith a rust (^â Ecidiuni fraxini Schw.). The worst cases have been. Fi<i. «7 Lirnien leaf spot {Cerrosponi). found in the vicinity of Cape Cod. The ash is also subject to
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. SHADE TREES. 195 Schw.) grows in the secretions of woolly aphis, causing a large spongy black mass on the leaves. Hawthorne {Cratcvyus). â The leaves of the English hawthorne are affected often seriously with Entomosporium thumenii Cke., which produces spots. Ash {Fraxinus). â The stems and leaves of the ash for the past few years have been troubled v/ith a rust (^â Ecidiuni fraxini Schw.). The worst cases have been. Fi<i. «7 Lirnien leaf spot {Cerrosponi). found in the vicinity of Cape Cod. The ash is also subject to a leaf spot (Septoria leucostroma E. & E.) and mildews {PhijUactinia suffulta (Reb.) Sacc. and Phyl- losticta viridis E. & K.). Locust (Robinia). â The locust is unusually susceptible to borers, and when attacked by them often l)ecomes infected with various species of fungi. Linden (Tilia). â The leaves of the linden are sometimes .badly affected with leaf spots, svich as Cercospnrn microsora Sacc, which may be largely controlled by. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Massachusetts Agricultural Experiment Station. Amherst, : Massachusetts Agricultural Experiment Station, 1907-1974
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