ECONOMIC VALUE OF FUMIGATION 243 



Were I to buy trees for personal use I should most cer- 

 tainly insist upon their being fumigated, especially if the 

 grounds of my neighbor were badly infested with San 

 Jose scale. I believe fumigation is a good thing aside 

 from any suspicion of the presence of the San Jose 

 scale, because it enables a man to start his trees as free 

 from insect pests as perhaps any process through which 

 he could put them. Dr. E. P. FELT, State Entomolo- 

 gist ', New York. 



Ohio. I have not had any reason to change my 

 former opinion as to its efficiency. Used at the proper 

 season, I do not know that there is the least danger to 

 nursery stock, and I do not believe, if properly used, 

 it is possible for a scale insect to pass through a fumi- 

 gating house alive. We may say, as among other 

 things connected with nursery work, and, in fact, every- 

 thing else, much depends upon whether fumigating is 

 done properly or improperly. All of the houses that I 

 have had built have been provided with slat floors and 

 we have generated the gas underneath. I find this is 

 much more practical than any other way that I have 

 tried. Of course for very small nurseries we have 

 advocated a tight box, but this is only where plants 

 like raspberries and blackberries are fumigated. Prof. 

 F. M. WEBSTER, Entomologist Ohio Experiment 

 Station. 



Pennsylvania. I have not made a thorough canvass 

 of our state in regard to the use of hydrocyanic acid 

 gas, but know that many of our nurseries have con- 

 structed fumigating houses and are carefully subjecting 

 infested stock to the gas treatment. This treatment is 





