Division of Entomology. 



ORCHARO mmm for the m jose scale. 



One Year's Experiments in Massachusetts. 



If. T. FERNALD. 



Summary. 



Treatment of orchard trees by fumigation is the best method where 

 the trees are small enough to be covered by a tent not costing too 

 much. As the cost of a tent rapidly increases with its size, however, 

 it does not pay to fumigate orchard trees more than lo or 12 feet 

 high and 6 or 8 feet across. 



Spraying with crude petroleum is somewhat expensive and the 

 results are not as satisfactory as with other materials. Other objec- 

 tions are the unreliability of the pump and the fact that a double 

 tank pump is not included in the average spraying outfit. 



Of the soaps, Bowker's Tree Soap gave the best results but was 

 somewhat more expensive than the others. 



All things considered the Lime, Sulphur and Salt wash proved the 

 most satisfactory, giving the best results, while its cost was only 

 medium, and only an ordinary spray pump was necessary for its 

 application. 



A fine aperture Vermorel nozzle worked satisfactorily with all the 

 materials used. 



None of the special materials sent for trial proved to be successful 

 enough to warrant further tests another vear. 



