48 



If (lie I'csiills of J)r. Muiicli on (he cause of svisceplibilily and 

 iiniiniiiity of forest trees to disease sliould prove true in the case 

 of this disease also, we iiiav ho])e to be abk' to control the bark 

 disease in shade, lawn, and park trees, by keeping np the water 

 content of the tree. 



AMiether nursery stock serves to introduce the disease into 

 new localities is an important problem to be determined by ob- 

 servation and experiment. The present method of inspection 

 and cutting out would be inefficient if the fungus Uves commonly 

 as a sai)ro})liyte at the base of the tree on dead bark and can at- 

 tain a parasitic habit with some slight change in weather condi- 

 tions. If, on the other hand, it exists only as a AA'Ound parasite, 

 then inspections Avould be possible and the cutting out method 

 effective. However, with such problems as these undecided, no 

 one can i)ronounce definite judgment upon the efficiency of the 

 cutting out method. Once however, these facts are established, 

 moditications may be made in tlie present method by which its 

 effectiveness may be insured at possibly a lower cost than can 

 now- be expected. 



The present method which the I'ennsylvania Commission has 

 adopted of eradicating only spots where the fungus is distinctly 

 parasitic, can accomplish a great good in a sanitary way, and 

 once sufficient facts are forthcoming, the method may be altered 

 to suit our knowledge and thus its efficiency assured. 



THE CHAIR.AIAN : The next paper, entitled "Recent Notes on 

 the Chestnut Bark Disease,"' will be delivered by Professor H. R. 

 Fulton, Division of Tathology, Pennsylvania State College. 



RECENT NOTES ON THE CHESTNUT PARK DISEASE. 



BY PROFESSOR II. R. FT^LTON, Pnni.'^ijlninia State Collerjc, State 



College, Pa. 



The steady au<l devastating spread of the cliestnut bark dis- 

 ease brings us face to face with a grave situation, and raises 

 many questions of great importance. Most of these will centre 

 about the three great questions : Is it pof^sible to check effectively 



