122 



Data obtained concerning the results of the final campaign of 

 1914 showed that in thirteen counties of west-central Illinois two 

 thousand barrels of creosote and a thousand barrels of coal-tar were 

 used, together with considerable quantities of other materials, and that 

 at least fifteen hundred miles of barrier were maintained in these coun- 

 ties at a total cost of $40,500 for materials and labor, with the result 

 to protect against injury by chinch-bug corn fields aggregating 

 190,590 acres and yielding 4,764,750 bushels of corn, a fourth of which 

 yield, worth $715,000, was due to the protective measures. This was a 

 net profit of $674,212 on an investment of $40,500, a ratio of 1665 per- 

 cent. If each infested wheat field had been wholly surrounded, the 

 profit would still have been 342 percent on the cost of labor and ma- 

 terials. 



Since it has proven impossible to induce farmers to surround in- 

 fested fields at harvest time with impassable barriers and lines of 

 traps, owing to the fact that the benefit of this complete operation de- 

 pends upon its performance by all owners of infested fields, legislation 

 is proposed similar to that in force for the control of the San Jose 

 scale and other pests of horticulture, but applying to chinch-bugs, 

 army-worms, Hessian flies, and a considerable series of insect pests 

 of agriculture, the effective control of which requires community ac- 

 tion. It is advised that any law of this character should be given 

 effect only by a proclamation of the Governor, based upon information 

 given him by the State Entomologist, and specifying the territory, 

 time, and extent to which the law shall apply. 



Errata 



Page 84, line 11, erase (Map 6). 



Page 90, line 13 from bottom, for (Map 2) read (Map 1). 



