INSECTS INJURIOUS TO CORN 175 



There are two generations each year, so that multiplication 

 and spread are rapid, especially as very few of the borers are 

 destroyed by natural enemies. The winter is passed in the larva 

 or borer stage within infested plants. 



To suppress this pest burn or otherwise destroy during the 

 fall, winter, or spring all cornstalks, corn stubble, crop remnants, 

 and stalks of garden plants, weeds, or wild grasses within the 

 infested areas likely to harbor the overwintering borers. Work of 

 this kind is now being conducted by the Federal, State, and local 

 authorities, and the hearty cooperation of all property owners, 

 tenants, or other interested persons is earnestly solicited. This 

 work must be done very thoroughly. The borers in a few over- 

 looked plants may increase by the end of the season to as many 

 as were present before the clean-up. 



To prevent the spread of the insect, quarantine measures, 

 both Federal and State, must be strictly enforced to prevent 

 shipment of infested plants or plant products out of the area 

 now infested. 



Since the date of this bulletin (April, 1919), the borer has 

 been found in about ten counties in Eastern New York, Schenec- 

 tady being near the center of the infested district; in the four 

 western counties of New York; in Rockingham Co., New Hamp- 

 shire; in many new localities in Massachusetts; in Erie Co., 

 Pennsylvania; in the counties of Ohio which border on Lake 

 Erie; in Monroe Co., Michigan and in the province of Ontario 

 where it is very abundant. 



Since little work has been done on the insect in this country 

 except through the U. S. Bureau of Entomology we give here also 

 a copy of the posters summarizing the apperance of the injury, 

 just as they were sent out by the bureau. It is impossible to 

 predict how rapidly the insect will spread or how well it will adapt 

 itself to our conditions. It can be said, however, that it is poten- 

 tially the most serious pest which has ever threatened the corn 

 of the country. 



