REPORT OF THE HORTICULTURAL 
DEPARTMENT. 
I. BORDEAUX INJURY# 
A, (Poet BRICK, 
’ 
SUMMARY. 
1. Bordeaux injury is known under several names, as “ spray 
injury,” “ bordeaux scald,’ “ bordeaux burning,” “ spray russeting,” 
“cork russeting,” and “ yellow leaf.” 
2. Accounts of bordeaux injury date back to the first use of 
bordeaux mixture upon the apple, and almost all subsequent workers 
in the field of experimentation have noted it. 
3. Injury occurs in some degree wherever bordeaux mixture 
is used. Correspondence has brought out the fact that it is found 
in all apple-growing sections of North America, Europe, Australia, 
Tasmania and New Zealand. 
4. Different species of plants are injured in different degrees 
by bordeaux mixture. The peach, dpricot and Japanese plum are 
most susceptible to injury. The common plum, quince, pear and 
apple are injured in about equal degree. Varieties of the above 
fruits are susceptible to injury in greatly different degrees. 
5. The amount of injury done to a given species or variety 
seems to depend: (1) Upon the specific susceptibility of the plant; 
(2) upon the solvent properties of cell sap on the copper hydroxid; 
(3) upon the permeability of the epidermis of the plant; (4) upon 
the weather conditions following spraying. 
6. There are many anomalies of occurrence brought about, for 
most part, by weather conditions; as, damage in some seasons, 
not in others; in some localities and not in others; some report 
dry seasons as favoring injury, others wet; some trees of a variety 
*A reprint of Bulletin No. 287. 
| [217] 
