660 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 10 



Material Used Percentage Killed 



"Mechlins's Scale Oil," 1-19 79%- 90% 



Sodium sulphocarbonate, 1-19 85% 



Sodium chloride, 1 gram to 5 cc. water 26%- 35% 



Sodium hydroxide, 2 pt. to 98 cc. water 85%- 95% 



Crude carbolic acid (100%) 2 cc. to 98 cc. of solution plus 



soap 2 lb. to 50 gal. water 93%-100%, 



This representative series of results show conclusively that the eggs 

 are susceptible to various insecticides, particularly lime-sulphur and 

 lime-sulphur combined with nicotine. They are also susceptible to 

 various chemicals not generally used as insecticides. 



Orchard experiments with lime-sulphur, 1-9, and hme-sulphur, 1-9, 

 combined with "Black-leaf 40," 1-500, gave good results in killing 

 eggs of A. avenoe and A. sorbi when the spray was applied as the buds 

 started to swell, March 31 to April 7. "Scalecide, " 1-15, apphed at 

 the same time did not give a satisfactory control for the rosy aphis. 



Carbolic acid and substances possessing phenol derivatives give some 

 promise of becoming important agents in the control of aphis in the 

 egg stage. So far as observed, crude carbolic acid in strengths up to 

 5 per cent acid will not injure young or old apple trees in a dormant 

 condition. Six trees, young and old, were sprayed with a 2 per cent 

 and a 5 per cent solution of crude carbolic plus enough laundry soap 

 to break the surface tension of water and no injury could be found. 



The greater percentage of kill with "Mechling's Scale Oil," when 

 compared with "Scalecide," is beheved to be due to the presence of 

 phenol derivatives in the former and not due to differences in specific 

 gravity because the two oils are practically identical in this respect. 

 In brief, miscible oils possessing phenol derivatives give a greater 

 percentage of kill, and this increase in kill is in all probability due to 

 the phenol or cresols. 



Scientific Notes 



New Tick Records for Minnesota. In December, 1915, a male Ornithodoros 

 talfije was sent to this office from Le Sueur, Minn. It had been found in the shop of 

 a glazier in that town. The only source from which the tick could have come was 

 hay in which it was stated glass had come packed from Oklahoma. The shop was 

 upstairs in a flat roofed building, with no attic. No birds, bats or other animals were 

 there. In April, 1916, a second specimen was sent in from the same source. This 

 cick has been reported formerly from Florida, Texas and California. 



A new tick has become established in Minnesota, i. e., Dermacentor albipictus. 

 Elk brought two or three years ago from Montana and placed in the game reserve 

 at Itasca Park have been badly bothered with these ticks ever since their arrival. 

 They became so bad this last spring as to require spraying of the animals. It is 

 supposed that they were brought here with the elk as they have never previously 

 been found in Minnesota. 



C. W. Howard. 



