. Manual of fruit diseases . Fruit. QUINCE DISEASES 389 although it does not necessarily bring about serious difS- culty. Yet in nurseries defohation is common, and some- times twigs are girdled. The quince orchards in New York State suffer rather severely, especially those in sod or those which are otherwise neglected. Even well-managed orchards are not always free from the disease. All varieties are sus- ceptible. Symptoms. Like the spots on pear leaves, there is produced a more or less circular discoloration on the upper surface, with a reddish. Fig. 113. — Types of lesions on quince-leaves
. Manual of fruit diseases . Fruit. QUINCE DISEASES 389 although it does not necessarily bring about serious difS- culty. Yet in nurseries defohation is common, and some- times twigs are girdled. The quince orchards in New York State suffer rather severely, especially those in sod or those which are otherwise neglected. Even well-managed orchards are not always free from the disease. All varieties are sus- ceptible. Symptoms. Like the spots on pear leaves, there is produced a more or less circular discoloration on the upper surface, with a reddish. Fig. 113. — Types of lesions on quince-leaves produced by the leaf-blight fungus. center and dull borders (Fig. 113). Finally the lesion extends through the leaf-tissue showing on the lower surface. The spot on the upper surface becomes dark-brown and a characteris- tic blackish elevation appears in the center, — the fruiting pustule of the pathogene (Fig. 113). When the spots are numerous, they coalesce (Fig. 113); in cases of severe attack the leaves turn yellow and fall. This defoliation is common in August and September. As a result of a serious infection the quince fruits remain small and the next year's crop suffers. The lesions on the twigs are sunilar in appearance to those on. 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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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1917
