RESPONSE OF PINES TO TREE RUST ISOLATES 



497 



ISOLATE NUMBER 



WISCONSIN NORTH CAROLINA MISSISSIPPI 

 12 12 12 



6 12 6 12 6 12 6 12 



AGE (MONTHS) 



^SURVIVING 



6 12 6 12 



■galled 



Figure 1. Gall development on pines inoculated with Cronartium 

 quercuum from three geographic sources. 



