64 



BULLETIN 934, U. S. DEPARTMENT OF AGRICULTURE. 



TABLE VIII. Results of inoculations with miscellaneous oomycetes on pines in 

 autoclaved soil at the time of sowing Continued. 



OTHER FUNGI. 



Data on the possible relation between various other fungi and the 

 damping-off of conifers have been already summarized by Hartley, 

 Merrill, and Rhoads (68, p. 546-550), Pestalozzia funerea on the 

 basis of the experiments of Spaulding (135), Botrytis cinerea on the 

 basis of observation and very preliminary inoculations, and Tricho- 

 derma Jconingi on cultural evidence only are all believed to be po- 

 tential causes of damping-off, though not ordinarily important. Al- 

 temaria sp. is under a certain amount of suspicion on account of its 

 frequent association with the damping-off of conifers, but it has 

 never been used in experiments. Rhizopus nigricans (incorrectly re- 

 ported as Mucor) , Trichothecium roseum, Rosellinia sp. from nursery 

 soil, Chaetomium sp. from maple roots, strains of Penicillium and 

 Aspergillus, Phoma betae, and Phoma spp. are all reported to have 

 been used in inoculations with negative results. 



Since the publication of the above summary a preliminary success- 

 ful inoculation experiment with Botrytis cinerea on recently emerged 

 Pseudotsuga taxifolia has been found briefly mentioned in an article 

 by Tubeuf (140) on another disease. Further experiments with va- 



