6 BULLETIN 1103, U. S. DEPARTMENT OF AGRICULTURE. 



pest swarmed over the entire State and in many cases as high as 95 

 per cent of the ears of sweet corn were infested. The pest was also 

 reported as much more numerous and destructive than usual in 

 Connecticut, and a single report was received from Newfane in the 

 southern part of Vermont. 



In the Middle Atlantic States the outbreak was unusually severe. 

 Pennsylvania reported the insect as abnormally destructive over the 

 entire corn-growing area. A similar report was received from Xew 

 Jersey, where an actual count showed sweet corn damaged to the 

 extent of 30 per cent and field corn 15 per cent. In Xew York the 

 infestation ran into the extreme northeastern corner on the Canadian 

 boundary. In Delaware the demonstration plats at the experiment 

 station showed from 10 to 15 per cent loss, and the pathologist of the 

 experiment station reported that usually Fvxarfaim monUiforme 

 Shel.. Cep7ialosporum ^acchari Butler, and Diplodia zeae Lev. are 

 associated with corn earworm damage. Virginia and West Virginia 

 reported the infestation general, Virginia estimating that from 3 to 5 

 per cent of the corn was lost because of the ravages of this insect, 

 while West Virginia recorded 90 to 95 per cent of the ears infested 

 by actual count. 



In North Carolina the pest was generally distributed, but not 

 reported as unusually abundant. In South Carolina the infestation 

 was most serious along the coastal region, extending from Aiken to 

 Horry Counties and southeastward to the coast, the center of the 

 infestation being in Barnwell County. In Florida the pest was 

 particularly abundant and destructive. By actual count the crop 

 was found to be damaged in some places from 10 to 25 per cent, while 

 in the region about Sandford fields were completely destroyed. 



In the North-Central States the infestation was unusually severe. 

 This pest, though usually present, rarely attracts any considerable 

 attention. In Michigan the entire lower peninsula was generally 

 infested, the infestation ranging from 10 to 75 per cent of the ears. 

 The southern half of Minnesota, north to a line extending from Clay 

 to Chisago Counties, was infested. On the experimental plats at the 

 station an actual count showed that from 20 to 30 per cent of the 

 ears were infested. In Wisconsin the southeastern counties were 

 quite generally infested north to Adams County, and west to and 

 including Dane County. In North Dakota the insect was unusually 

 abundant in the southeastern part, and in South Dakota it was serious 

 in the eastern tier of counties, and also in the central and west-central 

 counties. 



Arthur Gibson. Dominion entomologist, reports that by far the 

 worst infestation of which they have any record occurred in Canada 

 in 1921. In Ontario late sweet corn was injured in some fields to the 

 extent of 25 per cent of the crop. In certain districts the ears were 



