Cherries are subject to the same Brown Rot that affects peaches and plums. The trouble is extremely common on all these fruits, although perhaps the cherry is less seriously damaged than peaches and plums. White sweet cherries are more susceptible than sour and native cherries. The general statement is also made by authorities that the juicy, best-flavored varieties are more commonly affected than others. The Heiderman sand-cherry and Governor Wood both are listed as especially susceptible to Brown Rot; on the other hand, the Montmorency is relatively resistant. Susceptibility generally increases as cherries approach maturity.
Brown Rot is the most destructive disease of cherries. It may kill the blossoms, thus destroying the set of fruit. It may destroy a whole crop of green, ripe or ripening fruit (Fig. 47) before picking. The trouble is particularly destructive in transit and in the market. Sometimes leaves (Fig. 47) and twigs are blighted. The losses involved are frequently extensive. The disease commonly prevents choice cherries from being placed on distant markets. Losses have been estimated from 10 to 50 per cent. Its wide range over the globe and the numerous fruits which the Brown Rot fungus attack are factors in the economic importance of the disease. The disease is readily controlled by spraying with lime sulfur, diluted 1-40; first application, just before the blossoms open to prevent blossom blight; second application, just after the shucks have fallen, when fruits are about the size of peas; and again as the fruit begins to color. Arsenate of lead, 2 pounds to 50 gallons, should be added to the second application for worms. Finely ground sulfur and dry arsenate of lead 90 - 10 may be dusted on the trees instead of spraying them. (See more detailed discussion under Peach, page 270.)
Fig. 47. - Brown Rot on cherry.
Stewart, F. C. Notes on New York plant diseases, I. Cherry. Brown rot, Sclerotinia fructigena (Pers.) Schroet. New York (Geneva)
Agr. Exp. Sta. Bul. 328: 338 - 339. 1910. Clinton, G. P. Notes on fungous diseases, etc., for 1904. Cherry, Prunus avium. Brown rot, Sclerotinia fructigena (Pers.) Schrot.
Connecticut Agr. Exp. Sta. Rept. 1904: 316 - 317. 1905. Arthur, J. C. Rotting of cherries and plums. New York (Geneva)
Agr. Exp. Sta. Rept. 4: 280-285. 1886. Galloway, B. T. Brown Rot of cherry. U. S. Agr. Comm. Rept.
1888:349 - 352. 1889.