592 Report op Entomologists of the 



varied considerably in size and in age. Nearly every one of the 

 trees sprayed was badly infested with the scale. 



Experiment N'o. 4. — November 22, 69 trees were sprayed with 

 125 gallons of emulsion diluted to one part of the emulsion to four 

 parts of water. The weather was mild with but little wind. Two 

 hours were required for the apphcation ; cost per tree, nearly 

 1|- cents. 



Experiment No. 5. — November 22, 69 trees were sprayed with 

 125 gallons of emulsion diluted to one part of the emulsion to 

 nine parts of water. The weather was the same as in experiment 

 4 and the time required for the application the same. The cost 

 was 1 cent per tree. 



Experiment No. 6. — November 23, 85 trees were sprayed with 

 150 gallons of emulsion diluted to one part of the emulsion to 

 12 parts of water. The weather was cold and very windy. A 

 little more than two hours was required for the application of the 

 emulsion, and the cost per tree for the emulsion only amounted to 

 a little over -^-^ of one cent. 



Experiment No. 7. — November 23, 71 trees were sprayed with 

 150 gallons of emulsion diluted to one part of the emulsion to four 

 parts of water. The weather was the same as in experiment seven, 

 and the time of application the same. Owing to the wind much 

 of the emulsion was wasted. The emulsion cost .02 cents per tree. 



In these experiments the emulsion was used at various strengths, 

 varying from one part of the emulsion to four parts of water to one 

 part of the emulsion to twelve parts of water. These experiments 

 were duplicated with the 1 to 4 and 1 to 6 emulsions. Only one 

 application of the emulsion was made in each case. 



Results of Winter Treatment. — As previously mentioned, most of 

 the scale insects in the orchard at Hector were killed aj^parently by 

 the cold weather during the winter of 1894-5, hence we were unable 

 to follow the effects of the treatment to the end of the season. Soon 

 after the emulsion was applied, however, there was a decided change 

 in the appearance of the scales on some of the sprayed trees, the 

 young scales soon turned to a light yellowish brown color, shrivelled 

 up and dropped off very easily. This condition was most apparent 

 on trees sprayed with the emulsion diluted with four or six parts of 

 water. After examining the trees early in December, we esti- 

 mated that about 90 per cent of the scales were killed by the emul- 

 sion diluted with from four to six parts of water. Some of the 



