Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 Diseases of Fruits and Nuts 99 No adequate control is known. Keeping the trees in good vigor may lessen the injury, at least in Bartlett. Probably the removal of cankers on the pear and severely affected stone fruits in the vicinity will be helpful. Blight.âSee 'Fire Blight' (p. 101). Blister-Mite Effect.âA blister mite, Eriophyes pyri, causes yellow- ish, blisterlike spots or swellings on young pear leaves and fruits (fig. 49). These later turn dark, and the foliage and fruit is more or less de- I
Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 Diseases of Fruits and Nuts 99 No adequate control is known. Keeping the trees in good vigor may lessen the injury, at least in Bartlett. Probably the removal of cankers on the pear and severely affected stone fruits in the vicinity will be helpful. Blight.âSee 'Fire Blight' (p. 101). Blister-Mite Effect.âA blister mite, Eriophyes pyri, causes yellow- ish, blisterlike spots or swellings on young pear leaves and fruits (fig. 49). These later turn dark, and the foliage and fruit is more or less de- I 'â #i> Fig. 49.âBlister-mite effect on pear leaves and fruit; often mistaken for a fungus disease. formed. The same mite also causes bud blight, discussed later. This trouble is properly an entomological subject, but it is often mistaken for a fungus disease. See Extension Circular 87. Brown Rot.âPears from the coast districts in boxes or storage some- times show a fast-spreading, brownish rot, with a dusty, light-gray fungus, Sclerotinia fructicola or 8. laxa, on the surface, just as in apri- cots and peaches. Blossom blight also occurs (fig. 50) especially in the early-blooming Madeleine variety. This effect is easily mistaken for that of fire blight. The disease is not common enough in pears to warrant any attempt at control. Bud Blight.âAffected fruit buds turn brown early in the winter and frequently flare open. During the winter the buds are dry and drop read- ily when touched. At pruning time many of the buds fall off. At bloom-
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