18 



MASS. EXPERIMENT STATION BULLETIN 436 



1941 1942 1439 1944 1945 1946 Totals 

 Berkshire County 



Alford 1 2 4 7 



Dalton 1 1 



Egremont 3 2 3 19 



Great Barrington 11 6 6 13 27 



Hancock 1 1 



Lanesboro..._ 1 1 



Lenox 2 13 



Mount Washington 1 1 



New Marlborough 17 17 



Pittsfield 3 5 2 10 



Richmond...^ / 9 8 17 



Sandisfield 1 1 



Sheffield 1 5 2 13 21 



Stockbridge 2 12 14 



West Stockbridge 1 1 11 13 



Williamstown 1 1 



Hampden County 



Agawam 1 1 



Chicopee.- 2 2 



East Longmeadow 1 1 



Holyoke 2 1 3 



Longmeadow 1 5 6 12 



Southwick 2 2 



Springfield 2 3 5 10 



Westfield 1 12 



West Springfield 2 2 



Hampsliire County 



Granby 1 1 



Middlefield..._ 1 1 



South Hadley 1 1 



Totals 16 4 32 42 97 182 



Symptoms of the disease include wilting, curling, yellowing, early falling of 

 leaves, and brown streaking of fungus-infected wood. Affected trees die suddenly 

 or gradually. Elm bark beetles serve as carriers of the causal fungus. Adult 

 beetles penetrate between the wood and inner bark of weakened trees and en- 

 grave breeding galleries. Later the young emerge to feed on tender small twigs 

 and in so doing may inoculate trees if the fungus was carried from breeding gal- 

 leries by beetles. 



The spread of the disease during the past five years has borne out previous 

 experimental work and observations that the incidence of disease tends to build 

 up where conditions are most favorable for increase in population of carrier 

 beetles. Thus far relatively few valuable elms in Massachusetts have been 

 killed by the disease; but if the spread among weed elms is left unchecked, addi- 

 tional important losses may be expected. 



Interest and cooperation in control of the disease throughout the State is en- 

 couraging. The timely application of appropriate disease control measures may 

 materially check the spread of the disease. 



