The European Corn Borer. 17 
vegetable and flower crops, but the economic loss, as a direct re- 
sult of the feeding of the borers in any instance, seldom exceeded 
1 per cent of the value of the crop. The insect was present in nearly 
every commercial field of rhubarb, beets, celery, and beans examined 
in the infested area in Massachusetts during this season, the degree 
of infestation ranging from 1 to 75 per cent. The worst affected 
portions were usually found in weedy fields and along field borders, 
where the plants were growing among or in close proximity to in- 
fested weeds or corn. 
In order to present a general idea of the damage to the plants 
concerned, and the commercial loss sustained due to the attack of 
the borer, the following list of plants, with a brief mention of the 
extent of injury and intensity of attack, will suffice. 
RHUBARB. 
Affected to a greater extent than any other vegetable or garden 
crop, excepting sweet corn. Eggs of both generations found on 
leaves. Borers tunneled in the leaf stalks, seed stalks, and veins 
% 
: 
d 
A eS ial is 
Iric, 12.—Rhubarb stems infested with the European corn borer. 
of leaves and frequently caused them to collapse and break over. 
Injury occurred after close of commercial season and growth of 
plants did not appear to be seriously affected. (Fig. 12.) 
BEETS. 
Similar to that outlined under rhubarb. Borers tunneled ex- 
tensively in leaf stalks and infrequently entered the beet root. Injury 
did not appear to seriously interfere with the growth of the plant. 
(Fig. 13.) 
CELERY. 
Infestation light, but quite general. A few egg clusters found 
on leaves. Borers tunneled in the leaf stalks and in cases of severe 
injury the affected parts were unfit for sale. Affected portion usually 
could be removed with very little commercial injury to the rest 
