SOME STEM TUMORS OR KNOTS ON APPLE AND QUINCE TREES. 



of knots occurring on apple trees which is apparently the same 

 disease; this he reports from at least two localities in the State. 



Fig. 1. — Stem tumors 



liple tree at Mesilla Park, N. Mex. 



AVaite, of the Bureau of Plant Industry, reports the disease as com- 

 mon on the apple in tidewater Maryland and Virginia. 



DESCRIPTION. 



On the apple tree this disease appears most often on the trunk and 

 larger limbs (fig. 1), but in a number of instances it has been found 



[Cir. 3] 



