Intermediate, 

 suppressed 

 (54%) 



Oaks 

 (62%) 



Species group 



.04> 



Crown 

 position 



Blaci^ a 

 Chestnut 

 Oalt 

 (64%) 



Species group 



Other 

 (467o) 



Other ^ 

 oal(s 

 (54%) 



Crown 

 condition 



3 



Domlnon 

 Co-dominant 

 (37%) 



.15/ 



Intermediate, 

 suppressed 



(27%) 



.17^" 



Crown position 



Dominan^j^ 

 )o-domlnant 

 (16%) 



Oaks 

 (35%) 



Species group 

 77i 



Crown 

 condition 



Other 

 (2l7o) 





Block a 





Chestnut 





Oak 





(15%) 





Species group 





Other 





(87o) 



Inter-^ 

 mediate, 

 suppressed 



(247o) 



Crown position 



Dominonfy 

 Co-dominont 

 (13%) 



Figure 1.— Guide for estimating relative risl<s of tree mortality in areas expecting new 

 infestation by gypsy moth. Any tree can be assigned to a mortality group representing 

 its cliaracteristics. Average probability of tree mortality in our Pennsylvania study is 

 show/n in parentheses for each group. Fractions on each line connecting groups show 

 the portion of the sample in that group. Circled numbers indicate the 10 final groups 

 delineated by the AID analysis. 



3 



