DAMPING-OFF IN FOREST NURSERIES. 



21 



Table II. — Relative susceptibility to damping-off of different conifer 



species — Continued. • 





Reports of relative susceptibility. 



Host species. 



Not 

 sus- 

 cep- 

 tible. 



Least 

 sus- 

 cep- 

 tible. 



Less 



than 



average. 



Inter- 

 medi- 

 ate. 



More sus- 

 ceptible 

 than the 

 average. 



Most 

 suscep- 

 tible. 



Pinaeese (Abietoideae)— Continued. 





Nb...; 















N 

















T 





T(2) 



T 

























P 









T 





T 





T 









Nb.... 



N,T(3).. 





Bp, N,T.. 







Bp 





H 













B 











Nb.... 











Pinus ponderosa (type not specified) . . . 

 Pinus ponderosa (Eastern Rocky Moun- 



T(3).. 



P 



Bp, N (4), 

 T(6). 



H (4) 



Nb.... 



T(4) 



B 











B 















N (3) 





Bp, H.T.. 

 N 



B, H. 









P 









P 





B, H, N.. 

 T(2) 



N 



H, P.. 



C,N,T... 



Bp,T(3).. 











N. 







B 









Nb 

















N(3)T(3) 



H 



N, T(5)... 

 B 









Nb.... 





Pseudotsuga taxifolia (Northwestern 





B 





Nb.... 















Nb, P. 



Bu 















9 



6 



17 

 10 



51 

 31 



23 

 14 



48 

 29 



15 





9 



Sciadopitoideae: 















Nb. 



Cupressaceae (Cuprassoideae): 





Nb.... 

 Nb 



T 





Bu 























Nb . 











Nb 













N 















Nb 







P... . 









N 















T 















H. P.. 



T... . 



Nb.... 













Nb.... 



Nb 



T 























Nb.... 











Thuja orientahs 



P 







Nb 













Nb.... 





















9 

 39 



7 

 30 



2 

 9 



4 

 17 



1 

 4 













Sequoideae: 













B 













T 





Taxacese: 



P 



























The fact most evident in Table II is the extreme variation between 

 reports, not only on closely related species but even on the same 

 species. While it is, of course, possible that the obvious lack of a 

 definite basis and method of comparison in most of the reports is 

 responsible for most of this variation, it seems to the writer more 

 probable that different species do actually vary in their relative sus- 

 ceptibility to dampino;-off in different localities. In the first place, 



