Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 88 California Agricultitral Extension Service [Cm. 120 Peaches of the peeuto type and their hybrids, such as the Babcock and CO. Smith varieties, are not affected in this manner. Fruit Gumming, Split Pit.'—Clear, transparent gum breaks out on the surface of the young fruit and hardens into good-sized masses. Ef- fects of this nature may be produced by injuries, insect punctures, Cory- neum (peach blight) infections, and other causes, but the most typical disease occurs mainly in the Phillips Cling peac
Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 88 California Agricultitral Extension Service [Cm. 120 Peaches of the peeuto type and their hybrids, such as the Babcock and CO. Smith varieties, are not affected in this manner. Fruit Gumming, Split Pit.'—Clear, transparent gum breaks out on the surface of the young fruit and hardens into good-sized masses. Ef- fects of this nature may be produced by injuries, insect punctures, Cory- neum (peach blight) infections, and other causes, but the most typical disease occurs mainly in the Phillips Cling peach and seems to be due to Fig. 39.—Peaclies showing liail injury. a physiological cliaracteristic or weakness peculiar to this variety. This form of fruit gumming appears very early, before the pit hardens. It is more abundant when the crop is light. Affected peaches usually have the condition known as 'split pit,' in which the stone is more or less cracked and the embryo degenerates into a gummy mass. To prevent fruit gumming of Phillips Cling peaches, in years of a light crop, thinning' should be delayed fully 5 weeks after the pit begins to harden. In years of heavy crop, it should be done at least 10 days earlier than this. Hail Injury.—Peaches sometimes are much deformed, with numerous scars and pits (fig. 39) and masses of clear, hard gum on the surface. This is the effect of hail injury when the fruit was young. Internal Browning.—Occasionally in certain years or places, some- 23 Pqj. further information, see: Davis, Luther D. Delayed thinning as an aid in controlling the gumming of the Phillips Cling peach. California Agr. Exp. Sta. :l-14. 11 figs. 1937.
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