- 647 - 
Increased infestation over that of 1937 of the first generation in white 
potatoes occurred in central Connecticut and west-central Massachusetts, with a 
decrease in abundance in this host plant on eastern Long Island, N. Y. In 
Connecticut the average number of borers per 100 plants in 1938 was 358, as com- 
pared '"ith 106 in 1937; Haer^os in Massachusetts the average in 1938 was 280, 
as compared with 74 in 1937 • On Long Island the decrease was from an average of 
60 borers per 100 plants in 1937 to 30 in 1938. 
Favorable weather for the corn borer prevailed in the Lake States in 1938, 
with adequate .and well-distributed moisture in the field during the critical 
stages of the insect’s development. Considerable corn in northwestern Ohio was 
planted late and was only lightly infested by the borer. In central New Jersey 
meteorological factors operated to the advantage of the second-generation borer 
and seasonal conditions in New England were generally favorable. Floods and a 
hurricane in the latter region, however, made necessary the abandonment of the 
fall survey in Massachusetts, although observations indicate that no direct 
effects on prevailing borer populations were associated with the storm. Weather 
extremes of drought and excessive precipitation during oviposition periods of 
the borer are believed to be responsible for the low populations recorded in 
Delaware, Maryland, and Virginia in 1938. 
