ECONOMIC VALUE OF FUMIGATION 251 



insect life, that can but be deleterious to the tree if 

 allowed to remain thereon in an active condition. For 

 the past two years we have fumigated everything that 

 we have sent out except evergeens, and so far have 

 never detected any injurious effects. THE R. G. 

 CHASE COMPANY, Nurseries, New York. 



Utah. We believe this is the most efficient treat- 

 ment that nursery stock can be given. If the build- 

 ing is air-tight and the chemicals are mixed in the 

 proper proportion, it is undoubtedly destructive to all 

 kinds of insects and no harm results to the stock. 

 After putting gas into the building we leave our stock 

 stand from one-half to three-fourths of an hour, then 

 throw the double doors wide open, and allow the 

 building to ventilate from fifteen to twenty-five min- 

 utes before attempting to remove the stock. We 

 believe it pays us to run all nursery stock through our 

 cyanide house. We have treated from two to three 

 hundred thousand trees annually for the past three 

 years. In 1901 we expect to treat half a million. If 

 one had more stock than this it would be advisable to 

 build a larger house. We think it quite necessary to 

 have the roots of the trees comparatively clean. If 

 they are covered with dirt, especially clay soil, the gas 

 may not penetrate to the insects, especially woolly 

 aphis. Do not think our building cost to exceed $50. 

 VAN METER, HARNESS & Co., Proprietors Davis 

 County Nurseries, Utah. 



Utah. I have followed your directions for fumi- 

 gating, which have proven very satisfactory. I have 

 had no opportunity for experimenting with scale, but 



