516 MISC. PUBLICATION 657, U. S. DEPT. OF AGRICULTURE 
The spray should be apphed when the blossom buds show a trace of 
pink between the separating sepals. (See caution on p. 36.) 
QUERCUS (Oak) 
The oak spangles are small saucerlike galls attached by slender stalks 
to the underside of the leaves. They are usually in clusters and range 
in color froma pale toa vivid red. They are from 3 to 5 mm. in diame- 
ter and are made by /tonida poculum (O.S.). The vein pocket galls 
(fig. 135), are elongate pocketlike swellings along the midrib and sec- 
2 ~ — 
Figure 185.—Leaf galls on pin oak caused by Parallelodiplosis florida. 
