Trees and Timber 



399 



juring the lower branches of large trees; serious damage, 

 however, is not common. 



Damping-off {Fusarium sp.). — The general characters 

 are those mentioned under damping-off. It is serious in 



Fig. 211. — Cronartium ribicola on pine show- 

 ing sporiferous pustules. After Colley. 



Vermont, New York, Missouri, and probably in many other 

 states, killing the seedlings in nurseries as soon as they ap- 

 pear above ground. The beds should be given all ventilation 

 possible. A top-dressing of sterilized sand sprinkled over the 

 beds immediately after germination resulted in 30 per cent 

 of disease against 42 per cent in the untreated part. For dis- 

 infection of soil, see p. 460. 



