ECONOMIC VALUE OF FUMIGATION 233 



ooo." There are four nurserymen doing business 

 almost as large as the one quoted. On the supposi- 

 tion that these four nurseries have about the same out- 

 put and that they do four-fifths of the total business of 

 the province, the amount of stock sent through Ca- 

 nadian fumigation houses would be in the neighbor- 

 hood of two and a half million trees. 



Fumigation in Ontario has been limited almost 

 altogether to nursery stock, and practically nothing 

 has been done on orchard trees. As far as the 

 work in the nursery is concerned, I can say candidly 

 that I am much pleased with the results. No trace 

 of scale has yet been found on stock which has been 

 fumigated. It is true that the first year the Act 

 was in operation houses were built very hurriedly 

 and frequently in a slipshod manner, and fumiga- 

 tion was also performed in a half-hearted and be- 

 grudging manner by the nurserymen, but I have 

 found no trace of scale on nursery stock sent out that 

 year. I have made no improvement over the methods 

 and equipment outlined by yourself. I still follow 

 your formula as amended and your method of con- 

 structing fumigation houses. Of course, individual 

 nurserymen may have special contrivances for fixing 

 the door and providing ventilation. I find by expe- 

 rience that the doors and windows are the parts of the 

 house which are most apt to get out of repair. 



Dr. James Fletcher, Dominion Entomologist, who 

 has had charge of the fumigation houses at the ports 

 of entry, writes that in the fumigation of the nursery 

 stock in boxes at the border every bit of packing right 

 down to the roots is removed, and only the roots are 



