793 
Resume of Status of Parasites of European Com Borer 
at Close of 1940 Season 
Lake States area . — This area includes only the western portion of New 
York and Pennsylvani s. The 1940 fall survey indicates that in the Lake States 
area Lydella grisescens was the only parasite present in concentrations suffi- 
ciently high to he of economic importance and this status exists only in a nar- 
row area hordering the marshland on the southwestern shore of Lake Erie. The 
species is not known to have maintained itself near the marshland hordering any 
of the smaller lakes or ponds or at any other point in the Lake States area. 
Eu-lophus vi ri dulus i s present over a considerable part of the infested 
area in northwestern Ohio,' The exact limits of its dispersion have not heen 
determined but at no locality has it been found to be abundant. 
Inarec la ta p unctoria is present over a limited area in the vicinity of 
the Cattaraugus Greek, in the Cattaraugus Indian Reservation, ''N. Y. It was 
not reccvyerca at any other point in the area in 1940, ana, although, it possibly 
is present in extremely low concentrations at one or more points in the area 
(since it has been widely colonized), it is probably of no economic importance 
at any other locality in the Lake States. 
Macro cent m s gifuensis was recovered at only one point in the area and 
there only as a result of a current season’s release. 
At present no exotic parasite other than those cited above is on a 
maintenance basis in the Lake States area nor does it seem probable that any 
other of the parasites imported to date will prove of value in the area where 
the one-generation strain of the borer is strongly predominant. It is known 
that over the greater part of the infested area in the Lake States no parasite, 
either native or of foreign origin, is present in numbers sufficient to be of 
any economic value. 
Eastern States area . — In the Eastern States, however, including east- 
ern New York and Pennsylvania, where the multiple-generation strain of the 
borer predominates., the picture of corn borer parasitization presents a differ- 
ent aspect. The surveys of 1940, together with those of recent previous years, 
show that the two parasites, Lydella stabula ns var„ gr isescens and Inarecl ata 
punc tori a , are present over a considerable part of the infested area. Of the 
many widespread dispersion colony points of these two species., good establish- 
ment was found at practically all of those which it was possible to examine in 
1940. Prom campling the dispersion points and from observations at the earlier 
established test points, it is known that these two species are present in con- 
siderable concentrations throughout eastern Massachusetts and Rhode Island, 
throughout the Connecticut River Valley from the Massachusetts-New Hampshire 
line to Long Island Sound, in Suffolk County on Long Island, and at one or more 
points in New Jersey, L. grisescens is present on the Eastern Shore of 
Virginia. 
