173 



river valley south to the upper portion of the coast pine 

 belt. The bark is the so-called "quercitron bark" em- 

 ployed for tanning and as a dyestuff while the timber is 

 of some value. 



LIVE OAK. {Quercus virginiana ]Mill. ) — This oak oc- 

 curs only in the coast plain district and rarely extends 

 north of about 31°. This, one of the valuable timber and 

 tanning- trees of the state, is at times in the coast plain 

 counties a verj- important shade tree. 



SYMPTOMS OF THE DISEASE. 



The disease now under consideration makes its appear- 

 ance early in the sprinj^ before the new leaves are ma- 

 ture. A number of grey or bluish spots appear on the 

 leaf and the more rapid growth of the parenchyma of the 

 leaf at these points renders the surface convex on one 

 side and concave on the other. The concave side 

 of this spot or area is frequentlj^ on the upper 

 side of the leaf but the spots on the same leaf may 

 show variation in this regard. Some trees have been seen 

 in which tlie great majority of the concavities were upon 

 the lower surface but this is by no means the rule. These 

 characteristic depressions, or '"pockets," in the leaf re- 

 sult from the more rapid growth set up in that part of 

 the leaf by the presence and action of the fungus caus- 

 inj; the disease. These areas varv in diameter from 0.25 

 to 1 cm and are either isolated or confluent. In some of 

 the narrow leaved oaks, such as Quercus phellos and lau- 

 ri folia, it is not rare to find the spots confluent over so 

 large a part of the whole leaf that the leaf is as badly 

 curled as occurs in the peach leaf-curl, a closely related 

 disease. 



The rapid spread of the disease from one leaf to an- 

 other may lead to a partial or even complete' defoliation 



