Abstracts. 303 



"While it is undoubtedly possible to control the bud moth 

 by spraying the affected trees in the spring with arsenate of 

 lead (5 lbs. to 100 gals, water) this is practical only for orna- 

 mental and park trees." 



"The woodsland owner can, however, lessen the danger 

 of the much increased loss which will occur if the trees which 

 are weakened by the budworm are attacked by hordes of beetles 

 capable of breeding in them and completing their destruction. 

 This he can do by using proper methods in his logging opera- 

 tions." 



"Trees killed by the budworm are by no means valueless, 

 as they will remain sound for several years and can be utilized 

 for pulp-wood, provided they are not riddled by wood boring 

 insects." 



STUDIES ON THE VIABILITY OF THE POTATO 

 BLACKLEG ORGANISM.* 



Field studies and other general observations indicate that 

 in Maine the bacteria which cause potato blackleg do not remain 

 alive over winter in the soil where the disease has occurred. 

 This paper has to do with certain experiments the primary ob- 

 ject of which was to obtain more accurate data on this point, 

 under control conditions ; also to determine whether this ap- 

 parent inability of the bacteria to remain alive in the soil was 

 due to the low temperatures of the winter months or simply to 

 the fact that they were unable to retain their vitality in the soil 

 when separated from the host plant or after they had produced 

 complete decay of the tissues of the latter. 



Potato tubers inoculated with pure cultures of the blackleg 

 organism, Bacillus atrosepticus Van Hall, after they began to 

 decay were kept at o° C., or a fraction of a degree above, for 

 from one to 11 days and were then planted in the greenhouse. 

 All of these tubers decayed and only a small proportion of 

 them were able to produce sprouts that reached the surface of 

 the soil. These sprouts died down almost immediately with 

 blackleg. The pots of soil containing these diseased tubers were 



*This is an abstract of a paper by Glen B. Ramsey, having the same 

 title and published in Phytopathology, Vol. IX, pp. 285-288, 1919. 



