THE PEACH-TREE BARKBEETLE. 103 



No. 2't. — Used 24 trees of experimeut 23. Same treatment, plus barnyard 

 manure spread in 7-foot circle about each tree. 



Application made April 22, 3908. 



No. 25. — Used 24 trees of experiment 23, plus commercial fertilizer spread in 

 7-foot circle about each tree. 



Applied April 22, 1908; fertilizer applied May 7. 1908. 



No. 26. — One gallon chloronaptboleum. ennilsifled with 4 pounds of soap (dis- 

 solved in 4 gallons of water) : then added water enough to dilute to 2."'» g.-illoiis. 

 Si)rayed 120 trees. 



First application, April 22, 1908; second application, July 7, 1908. 



\o. 27. — I'sed 24 trees of experiment 2(i: .iddcd i)arnynrd mauui'e, spreading 

 it in a 7-foot circle about each ti*ee. 



First application, April 22, 190S; second application, July 7, 1908. 



No. 28. — Used 24 trees of experiment 20, adding commercial fertilizer, 4 

 pounds to each tree, spreading it in a 7-foot circle. 



First application, April 22. 1908: fertilizer added May 7, 1908; second applica- 

 tion, July 7, 1908 (3 pounds fertilizer added). 



No. 29. — One gallon chlorona[)tholeum mixed with 22 pounds flour to emul- 

 sify, added to 30 gallons water, and put on 120 trees with sprny pump. 



First application, April 17, 1908 ; second application, July 13, 1908. 



No. 30. — Used 24 trees of exi)eriment 29; added barnyard manure to get 

 value of fertilizer. 



First application. April 17, 1908; second application, July 13, 1908. 



No. 31. — Used 24 trees of experiment 29, adding commercial fertilizer, 4 

 pounds, to each tree. 



First ai)plication, April 17, 1908; fertilizer added ]May 7, 1908; second ap- 

 plication, July 13, 1908. 



No. 32. — Six pounds arsenate of lead to 50 gallons water; 8 pounds lime 

 added to neutralize the free arsenic. Put on heavy spray ; pruned trees before 

 spraying; 170 trees sprayed. 



First application, April 20, 1908; second application, July 13, 1908. 



No. 33. — Boiled lime and sulphur spray (la pounds lime, l.'i pounds sulphur, 

 50 gallons water). Excessive api)lication made to 200 trees. 



First application, April 24. 1908; second application. July 1.3. 1908. 



No. 3-'/. — Self-boiled lime-sulphur wash (li") ])ounds lime. 10 pounds sulphur, 

 50 gallons water). Water added slowly so as to pi-event burning, stirring 

 vigorously during the process. Sprayed 300 trees. 



First application. May 18, 1908; second application, July 13, 1908, to trunks 

 and larger limbs. 



No. 35. — A stock solution of kerosene emulsion, 20 per cent strength, was 

 made and to each gallon of stock solution 2* gallons rain water were added. 

 Applied with spray pump. 



Application made April 20, 1908. 



No. 36. — Fumigated 6 trees with hydrocyanic-acid gas for one hour, first 

 scraping off all gum and rough bark. Treatment given August 24, 1908. 



No. 37. — Tree tanglefoot. Put bands around 12 trees and then covered 

 bands with tanglefoot. Application made April 2c. 1908. 



No. 38. — Renovation block. Pruned back severely about 100 trees (girdling 

 4 trees for traps and not treating them further) ; applied fertilizer twice and 

 kept trees cultivated all summer. 



First application. April 19. 190,S: fertilizer ndded May 7. 1908 (4 pounds per 

 tree). Second application, July 3, 1908 (3 pounds fertilizer added). 



