. Manual of fruit diseases . Fruit. 152 MANUAL OF FRUIT DISEASES on Oldenburg apples while still hanging on the tree at Ithaca, New York, by the junior author. Later it was found in market fruit. So far, it has done no great damage in the United States, partly due, no doubt, to its very limited range. Up to date it has not been reported outside of New York State, although it doubtless occurs, to some extent at least, in several of the apple regions of North America. The disease is induced by the fungus Phytophtliora cactorum. Affected apples were first ob- served in July on those fruits neares
. Manual of fruit diseases . Fruit. 152 MANUAL OF FRUIT DISEASES on Oldenburg apples while still hanging on the tree at Ithaca, New York, by the junior author. Later it was found in market fruit. So far, it has done no great damage in the United States, partly due, no doubt, to its very limited range. Up to date it has not been reported outside of New York State, although it doubtless occurs, to some extent at least, in several of the apple regions of North America. The disease is induced by the fungus Phytophtliora cactorum. Affected apples were first ob- served in July on those fruits nearest the ground. Earlier infections were not seen. These facts indicate strongly that the source of the inocuhun is the soil. Infections occur up to the time of the ripening of the fruit. A brown-rot is produced which in many respects closely re- sembles fire-blight lesions on apple fruits (Fig. 40). The affected portion appears water-soaked at first, the margin is not definite, and there are no external evidences of fungus fruiting bodies. Refehencbs Whetzel, H. H., and Rosenbaum, J. The Phytophthora rot of apples. Phytopath. 6 : 89-90. 1916. Osterwalder, A. Die Pliytophthorafaule beim Kernobst. Centralbl. f. Bakt. 2 : 15 ; 1905. BubSk, Fr. Die Phytophthorafaule der Birnen in Bohmen. Zeitschr. f. Pflanzenkr. 20 : 257-261. Fig. 40. — Phytophthora-rot of 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 Hesler, L. R. (Lexemuel Ray); Whetzel, Herbert Hice, 1877-1944. New York : Macmillan
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