18 CIRCULAR 6 5 6, U. S. DEPARTMENT OF AGRICULTURE 



In case shellac or rosin and fish oil are not available under existing 

 priorities an orchardist should obtain information about the proved 

 merit of any dressing that he proposes to substitute because, as the 

 experiments reported herein show, a wound dressing only slightly toxic 

 may have an injurious effect on apple tree wounds. The hazard of 

 such dressing might be greater than that from possible heart rot injury. 



LITERATURE CITED 



(1) Brooks, F. T. 



1928. plant diseases. 368 pp., illus. London. 



(2) and Moore, W. C. 



1926. silver leaf disease. Jour. Pomol. and Hort. Sci. 5: 61. 



(3) Childs, Leroy. 



1930. NICOTINE IN PAINT FOR WOOLLY APHIS CONTROL. Joiir. EcOn. 



Ent. 23: 883. 



(4) Cooley, Jacquelin S. 



1932. PERENNIAL CANKER AND ITS RELATION TO WINTER INJURY AND TO 



woolly aphis. Northwest. Fruit Grower 4 (2) : 6, 12-13. 



(5) Cope, Joshua A., and Spaeth, J. Nelson. 



1931. the killing of trees with sodium arsenite. Jour. Forestry 



29: 775-783, illus. 



(6) Crenshaw, J. H., and Cooley, J. S. 



1931. experimental freezing of apple trees. (Abstract) Phyto- 

 pathology 21: 997-998. 



(7) Day, Leonard H, 



1927. zinc chloride stays canker blight. Better Fruit 22 (3) : 9, 21. 



(8) Howe, G. H. 



1915. EFFECT OF VARIOUS DRESSINGS ON PRUNING WOUNDS OF FRUIT 



trees. New York (Geneva) Agr. Expt. Sta. Bui. 396, pp. 

 83-94. 



(9) Marshall, Rush P. 



1931. THE RELATION OF SEASON OF WOUNDING AND SHELLACKING TO 



callus formation in tree wounds. U. S. Dept. Agr. Tech. 

 Bul. 246, 29 pp., illus. 



(10) 



1931. WATER BLISTERING OF WOUND DRESSINGS. Phytopathology 



21: 1173-1180, illus. 



(11) Rose, D. H. 



1917. EFFECT OF VARIOUS DRESSINGS ON PRUNING WOUNDS OF APPLE 



trees. Mo. State Fruit Expt. Sta. Cir. 10, [4] pp. 



(12) Shear, G. M. 



1937. LANOLIN AS A WOUND DRESSING FOR TREES. Amer. SoC. Hort. 



Sci. Proc. (1936) 34: 286-288. 



(13) Swarbrick, Thomas. 



1926. healing of wounds in woody stems. Jour. Pomol. and Hort. 

 Sci. 5:98-114, illus. 



(14) Tilford, Paul E. 



1940. tree wound dressings. Natl. Shade Tree Conf. Proc. 16: 



41-54, illus. 



(15) Walter, James M., and Mook, Paul V. 



1941. TRANSMISSION OF THE PLANETREE CERATOSTOMELLA IN ASPHALT 



wound dressings. (Abstract) Phytopathology 31: 23-24. 



(16) Zeller, S. M. 



1926. CANKERS OF APPLE AND PEAR IN OREGON AND THEIR CONTROL. 



Oreg. Agr. Expt. Sta. Cir. 73, 29 pp., illus. 



