Table 2.— Predicted versus observed tree loss by year based on q,, the average probability of tree loss by 2-inch (5.1 -cm) tree 

 diameter class (Situation A, Klein and others 1978) 







Number of trees 









Diameter 



Year of 



per acre 









Predicted 



class 



infestation 



Green 



Dead 



1/Dt 



qt 



tree loss 



• 



6-inch 



n 

 u 



79.8 



0.3 



o.ooo 





U. 1 H 



(15.2-cm) 





79.5 







n 



U 



1 .uuuu 



n 

 U 



2 



79.5 



.3 



3.333 



.9857 



14 





3 



79.2 



2.1 



.476 



.9873 



.99 





4 



77.1 











1.0000 









5 



77.1 











1.0000 









6 



77.1 





















Total loss: 



2.7 



Average: 



.9937 



1.27 









(D. / 0/ naj 







(3.175/ha) 



R-inrh 





62.7 



.8 



1 c'^n 



1 . ^ou 



n Q84 





/on ^ nm\ 



1 



61.9 



.8 



1.250 



.yo4 







2 



61.1 



2.7 



.370 



.983 



2.92 





3 



58.4 



8.1 



.120 



.982 



7.99 





4 



50.3 



.7 



1.430 



.980 



.63 





5 



49.6 



.5 



2.000 



.980 



.63 





6 



49.1 





















Total loss: 



13.6 



Average: 



.982 



13.96 









/OA n/Ko\ 



(o4.U/na; 





(34.9/ha) 



1 u-incn 



n 

 u 



38.8 



0.8 





n Q74 



1 nq 





1 



1 



38.0 



1.1 





Q74 



1 4fi 







36.9 



3.9 





Q79 



A 7Q 





3 



33.0 



10.6 



.0943 



.964 



10.38 





4 



22.4 



1 .4 



.714 



.955 



1.09 





5 



21.0 



.6 



1.667 



.953 



.44 





6 



20.4 



.2 



5.000 





.14 





7 



20.2 





















Total loss: 



18.6 



Average: 



.965 



19.39 









(46. 5/ ha) 







(48.475/ha) 



12-incn 



n 



17.0 



0.6 



1 fifi7 

 1 . uu / 



n 94? 



0.95 



(ou.D-cm) 



-1 



1 



16.4 



1.3 



7RQ 



.938 



1.91 





z 



lb.1 



O Q 

 Z.O 



.357 









3 



12.3 



4.2 



.238 



.902 



4.06 





4 



8.1 



1.2 



.833 



.875 



.88 





5 



6.9 



.2 



5.000 



.863 



.13 





6 



6.7 



.1 



10.000 





.64 





7 



6.6 





















Total loss: 



10.4 



Average: 



.909 



11.87 









(26.0/ha) 





(29.675/ha) 



4 



