THE CHINCH BUG IX IOWA. 7 



cent, possibly a little less) which killed plant lice almost instantly, 

 affected Chinch Bugs but slightly if at all, and they afterward recov- 

 ered and lived in confinement for many days. 



On August 15th applied kerosene emulsion to bugs accumulating 

 on corn rows, using an emulsion diluted to contain about six per 

 cent, kerosene and spraying with cyclone nozzle from a wagon; great 

 numbers could be found dead within a few minutes after the applica- 

 tion, and on the following day hosts of dead could be found on the 

 ground around the hills treated. In places however the stalks had 

 become well covered by live bugs that had moved in to fill the places 

 of those destroyed. As this application was made irregularly on 

 hills most infested on an irregular patch I cannot say as to the exact 

 amount used on a given area, but think it was less than used in 

 previous applications. 



Subsequently the Farm Department applied on a large scale 

 using a five to six per cent, emulsion, and spraying from barrels in a 

 wagon, one man working the force pump and managing the team, 

 while another manipulated the hose and nozzle, walking rapidly 

 among the hills of corn and directing the spray upon masses of bugs. 

 This resulted in the destruction of great numbers of bugs, but no 

 record of the area being kept, it is impossible to state the exact cost. 



The cyclone nozzle was found by all means the most satisfactory 

 in spraying for this purpose. 



I suggested the trial of emulsion to some of my correspondents, 

 and I extract a paragraph from one letter received in reply. 



DEAR SIR: Your most satisfactory letter received some time 

 since. The emulsion is a success; it was instant death to the Chinch 

 Bugs, but it takes so much when you want to go over five or six 

 acres that one cannot stand the expense. It could be stood to go 

 over it once or twice if I could have got the bugs all on the corn, 

 but they would a part stay on the corn while the rest would lie under 

 sods and anything else that would protect them from the sun. 



J. E. WARREN, Cambridge, Iowa. 



The use of kerosene can hardly be expected to prove of value 

 except when the bugs are massing on corn; at this time application 

 to an acre or two of the field next to stubble may do much to save 

 the rest of the field. By arranging nozzles with special reference to 

 most efficient work in corn rows and while corn is small enough to 

 drive a team astride of one row I think spraying can be done 

 thoroughly at a cost of thirty to forty cents per acre for material. A 

 cyclone nozzle with pressure sufficient to do good work, discharges 

 about one pint of liquid per minute. Adjusting three nozzles to play 

 upon one row of corn, one each side and one from above, and 

 allowing the team to walk slowly (two miles per hour) it will take 

 thirty gallons of liquid per acre, which, using five or six per cent, 

 emulsion, costs about thirty cents, exclusive of labor, which for team 

 and man an hour and a quarter would be about forty cents more. 

 First cost of force pump must of course be considered. The cost of 

 labor on the farm however where the farmer uses his own team and 

 does the managing of the apparatus himself might be considered 



