The book A Disease of Pines Caused By Cronartium Pyriforme was written by author George G George Grant Hedgcock Here you can read free online of A Disease of Pines Caused By Cronartium Pyriforme book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Disease of Pines Caused By Cronartium Pyriforme a good or bad book?
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Do Often very long (PL I, fig. 2). Often very long (PI. I, fig. 1). ' Often not very pro- nounced. Do. Do. Usually very short. Usually very short (PL I, fig. 3). Usually very short. Ellipsoid or obo- vatetopyriform. . Do 8500, Eldorado Springs, Colo. do The senior writer, during August, 1914, visited Newfield and several other localities in the same region. He found the same species of pine here that are known to occur in southern New Jersey and that probably were present at the time of the Ell...is collection, viz, Pinus echinata, P. Rigida, and P. Virginiana. None of these were found by him to be diseased with the Peridermium of Cronartium pyriforme. A DISEASE OF PINES CAUSED BY CEONAKTIUM PYRIFORME. 7 Comandra umbellata observed in a number of these localities was also free from the rust. In 1914 the senior writer found Pinus pungens, P. Rigida, and P. Virginiana closely associated in a mixed forest near Greenwood Fur- nace, Pa. In this instance Pinus pungens was attacked by Peri- dermium pyriforme so badly that in some places more than 50 per cent of the trees were killed, and although Comandra umbellata plants bearing the telial form of the rust were present in abundance, no pines of either of the other species were diseased.
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