THE CANADIAN ENTOMOLOGIST 203 



B. Harrowed in immediately after application. 



25 lbs. Bran and 25 lbs. Shorts, Vz gallon Molasses, 1 lb. Paris 

 Green, 4 gallons Water. — 70% dead. 



50 lbs. Shorts, 3^ gallon Molasses, 1 lb. Paris Green, 4 gallons 

 Water.— 80% dead. 



Most of the experiments were repeated from three to ten times 

 under varying conditions, and the relative killing values were in 

 everv case similar to those given aboA^e. A few experiments in 

 which sugar was used showed a marked inferiority. 



For Enxoa ochrogastcr the unharrowed plots gave slightly 

 better results than the harrowed, and it was observed that this 

 species feeds more frequently above the ground than does P. 

 orthogonia. 



By experimenting with varying amounts of Paris Green, and 

 sweetening substances, we arrived at the following formula as 

 giving the best results: Shorts, 50 pounds; Molasses, 3^ gallon; 

 Paris Green, 1 pound, and Water, 23/^ gallons. 



This mixture costs from $1 to $1.25 per acre for the ingredients 

 alone, but since cutworms begin to damage a field in nearly every 

 case in small well-defined areas, from which they spread subse- 

 quently over far larger areas, prompt treatment as soon as damage 

 is seen reduces the cost per acre of the area saved to a small figure. 



The superiority of Shorts over Bran has been again established 

 in the control of Army Cutworms {Chorizagrotis spp.), which in- 

 vaded part of the Province early this year. Results from field 

 experiments upon these species are rather uncertain, since the 

 migratory habits are so pronounced. In specially constructed field 

 cages definite results were obtained, and comparisons show that 

 the value of poisoned Shorts is certain, while the application of 

 poisoned Bran is of very doubtful benefit when judged from the 

 aspect of cost and results. The cages were set out in a clean field 

 of spring wheat, so that the 50 worms placed in each, though 

 confined to nine square feet, were in every other respect under 

 identical conditions with those experienced in nature. 



Unfortunately the weather turned cold when we started these 

 experiments, and has remained so ever since, so that our percentage 

 killings are not quite so high as they might have been had feeding 

 been more general. Little of the wheat was eaten. 



