346 MAINE AGRICULTURAL EXPERIMENT STATION. I9IO. 



Russeting or spray injury of fruit. Bordeaux mixture, some 

 of the prepared brands of lime-sulphur, and to a less extent 

 home-cooked and self-boiled lime sulphur spray, may produce 

 a russeting of the fruit.** The relative merits of lime-sulphur 

 and bordeaux mixture as a spray for apple trees will be dis- 

 cussed elsewhere in this publication. 



Experience at other places and at this Station has shown 

 that bordeaux mixture is more likely to produce spray injury 

 than most of the lime-sulphur sprays now on the market. Bor- 

 deaux injury first appears as small, regular, black or brown 

 spots scattered over the apple, but more frequently on those 

 parts which received the most spray. These spots differ from 

 those caused by the apple scab fungus in that they are more 

 regular and are not sunken. As the apple grows these spots 

 are replaced by russeted blotches. In severe cases the fruit 

 may become distorted, irregular and sometimes cracked. Fig. 

 239 represents the later stages of bordeaux injury on the fruit. 



The following list prepared by Hedrick classifies apples 

 according to their immunity to bordeaux injury.f 



"i. No injury or very slight. — Alexander,* Akin, Bietig- 

 heimer, Bloomfield, Baxter, Canada Baldwin, Doctor, Doctor 

 Walker, Deacon Jones, Domine, Early Harvest, Esopus Spitzcn- 

 bnrg, Fall Pippin, Fall Wine, Fishkill, Florence, Gano, Golden 

 Russet, Judson, Keswick, Northern Spy, Oliver, Perry, Pommc 

 Grise, Ralls, Red Canada, Richard Early Winter, Rome, Rox- 

 bury, Rutledge, Smokehouse, Stump, Swaar, Titovka,* Tomp- 

 kins King, Yellow Bellflov/er. 



"2. SligJit injury. — Buckingham, Chenango, Clayton, Elgin 

 Pippin, Fallaw^atcr, Fameuse, Fanny, Gideon, Grimes, Haas, 

 Holland Winter, Hubbardston, Jewett, Karabovka,* Lady, Lady 

 Sweet, Landsberg, Louise, Mcintosh, McMahon, Maiden Blush, 

 Monroe Sweet, Munson, Oldenburg,* Ontario, Pewaukee, Pri- 

 mate, Prince Albert, Pumpkin Sweet, Red Astrachan,* Reinette 

 Pippin, Saint Lawrence, Shannon, Stanard, Stark, Sutton, Te- 



** For an account of spraying experiments conducted in i^io with 

 a discussion of the spray injury from lime-sulphur and bordeaux mix- 

 ture the reader is referred to a forthcoming bulletin of this Station by 

 Mr. W. W. Bonns, the Station Horticulturist. 



t Hedrick, U. P. N. Y. Expt. Sta. Bui. 287, p. 142, 1907. 



* Russian varieties. 



