6. Spraying experiments at this Station and almost everywhere in 



the United States show that the lime-sulfur wash gives the 

 best average results. 



7. The insecticide in this wash is probably either calcium thiosul- 



fate or nascent sulfur produced as the materials present 

 break up chemically. 



8. Long boiling of the wash (40 minutes to one hour) has given 



better average results than boiling for half an hour or less. 



9. Letting the wash stand for a day after it has been made is not 



safe, though exceptions where good results under these 

 conditions are obtained, are frequent. 



10. Self-boiling washes are sometimes fairly successful but good 



results cannot be safely counted on. 



11. The K-L Mixture has not proved a success at Amherst and in 



many other places. It is very expensive as compared with 

 the lime-sulfur wash. 



12. A summary of the experimental treatments for the scale, made 



in this country, indicates that there is nothing better than 

 the lime-sulfur wash where boiling is possible. 



13. Where boiling is impossible or where only a very few trees are 



to be treated, Scalecide used under certain conditions 

 named, may prove a satisfactory substitute. 



14. Most of the " proprietary insecticides " for the scale are either 



pure "fakes;" give poor results, or are so expensive as 

 to be unprofitable to use. 



15. Directions for making the wash, and how and when to apply it 



are given fully. 



16. Summer spraying with whale-oil soap will often hold the scale 



in check till winter applications can be made. 



