128 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 17 
21 percent of infested stalks had borers in 24 inch stubble 
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During the past season an experimental field with several plots of 
different varieties of corn planted on different dates was maintained to 
secure data in regard to the relative infestation of different varieties of 
corn as well as to obtain information concerning comparative yields of 
various varieties. The infestation was so slight that no definite informa¬ 
tion was gotten. However, no infestation was noted on plots planted 
after June 11. This work will continue next year. 
Conclusions 
1. There is no indication of two generations per year in Ohio. 
2. The insect has increased enormously within the last year but as 
yet has done no commercial damage. 
3. Sweet corn and dent corn are equally infested. 
4. We have no evidence pointing to the probable efficiency of trap 
crops. 
5. The longer the corn fodder stands on the stalk the greater will be 
the percent of borers in the stubble. 
6. From 10 to 20 percent of the infested stalks have borers in the 
stubble. 
MEASURES RECOMMENDED FOR THE CONTROL OF THE 
EUROPEAN CORN BORER IN THE PROVINCE OF ONTARIO 
By L. Caesar, Provincial Entomologist, Guelph, Ontario, Canada 
Abstract 
In Ontario there is only one brood of Pyrausta nubilalis Hubn. a year; corn is 
practically the only host plant; most of the stalks even of corn grown on the ear are 
consumed by live stock; the acres of corn per farm scarcely average 10. Under these 
conditions control recommendations are:—Cut the corn low. Ensile it or run it 
through a shredder or cutting box, or feed it whole, but in last case pile uneaten 
portions by themselves and haul them out and burn. Leave no cut or shredded or 
whole corn stalks or cobs in the barn or field or elsewhere. Either burn them or 
plough them under. Ploughing under of stubble and corn remnants is of great value 
but must be thorough and they must not be dragged up later in cultivating. Prepare 
for thorough-ploughing by first rolling or discing the stubble or by running plough 
shallowly beneath it and then using a harrow. Cultivate only with disc and sow 
with disc drill. Complete all clean up measures and ploughing by June 1st. In 
