176 r>. C. Entomological Society 



they appear to be dead, but iisuallj' survive. Tliis may perliaps be owing 

 to some of the larvae being more securely embedded in the roots or crown 

 of the tree than others, or some variation in the temperature and humid- 

 ity Avithin the fumigating chamber. Although 65° to 70° Fah. is the tem- 

 perature usually maintained within the fumigating chamber, tlie humid- 

 ily may vary owing to outside atmospheric conditions. 



Blackberry Root Borer 

 The blackberry and raspberry root borer (Bembecia marginata), is 

 about as immune to the ordinary fumigating process as the peaclt root 

 borer, and, to insure against distributing either of these pests, all the 

 trees, bushes, vines and canes are thoroughly insjDected. Any sign of 

 the eastings or borings of the insects condemns the tree, etc., to the 

 bonfire. 



Vacuum Fumigation 



I have referred to the foregoing treatment of insects as applying to 

 the ordinary fumigating process for the following reason: 



We have great expectations regarding the vacuum process, by which 

 we hope to get better results as regards the destruction of certain insect 

 pests without injury to the stock or products they infest. ' 



Vacuum fumigation is not entirely new in connection with the treat- 

 ment of certain products, such as cotton, etc., but there are still a few 

 problems that require working out to perfection regarding the treatment 

 of certain nursery stock. 



Mr. D. B. Mackie, of the California State Department of Agriculture, 

 has already done excellent work solving the problems referred to. I 

 could not do justice to his work were I to try and explain in detail all 

 that he has accomplished. But we may look forward to a greatly improv- 

 ed method of nursery stock fumigation in the near future. 



THE PEACH TWIG BORER, (Anarsia lineatella) 

 IN BRITISH COLUMBIA 



By R. C. Treherne, Entomological Branch, Ottawa. 



In the years just preceding 1915 the peach growing industry of 

 southern British Columbia was somewhat depressed. Prices had not been 

 good and much disheartenment was in evidence. In 1915 the price for No. 

 1 wrapped peaches varied between 45 cents and 75 cents per 20 pounds. 

 In 1916 the price varied between 60 cents and $1.00. In 1917 the peach 

 industry showed signs of revival, the prices being received in this year 

 varying from 75 cents to $1.25 to the grower. Much concern, however, 

 was shown over the depredations of the Peach Twig Borer or Peach Worm, 

 an insect which liad been allowed to increase to such projjortions in the 



