86 ENTOMOLOGICAL SOCIETY OF ONTARIO 



method, however, is expensive and the materials used are intensely poisonous However, 

 for large nurseries whe-e mauy youug tree3 have to be disinfected before being sent out, 

 this is stated to be the best method and is very generally adopted by the large American 

 nurseries. 



The plants are placed under a canvas tent made air tight by painting it twice with 

 linseed oil. The first coat must be quite dry before thesecond is applied. The size of 

 the tent is immaterial, but must cover the trees entirely, and the edges of the tent should 

 be long enough to lie on the ground so that the tent may be perfectly air-tight by having 

 earth thrown upon the lower edge to prevent the gas from escaping. The latest formula 

 for generating the gas is as follows : 



Cyanide of potassium (98 per cent) 1 ounce 



Sulphuric acid (66°) 1 ounce 



Water 2 ounces 



for every hundred feet of space to be fumigated. Put the acid and water in an earthen- 

 ware vessel large enough to prevent spattering, then place the jar under the tent and add 

 to it the cyanide of potassium and close the opening quickly. The trees should be treated 

 for at least forty-five minutes, when it will be found that insects of all kinds have been 

 destroyed. 



For the treatment of nursery stock prior t shipment large air-tight chambers or 

 boxes are made in which the trees are placed. 



Warning. — There is at the present time a great demand on the part of fruit growers 

 for protective legislation both from the Provincial and Dominion Governments, 

 and it is possible that something may be done in this direction ; but, in the mean 

 time, I would urge upon fruit growers and every one else to protect themselves 

 and the country at large by putting into practice what after all are only ordinary 

 common-sense measures of precaution. Foremost among these are certainly the exercis- 

 ing of the greatest care possible in buying nursery stock. As far as we have been able 

 to learn, none of our Canadian nurseries are yet infested. Therefore, stock purchased at 

 these nurseries, if grown in Canada, must be much safer than any that can be imported 

 from nurseries in the United States which are known to be infested. Owing to the diffi- 

 culty of detecting the scale on trees when it only occurs in small numbers, and to the 

 fact that it infests almost every kind of plant- likely to be imported, I do not consider it 

 safe to accept for this insect the guarantees sometimes given by nurserymen that stock ia 

 free from infestation. It will be far better for Canadian growers to do without imported 

 trees altogether, for a year at any rate, until we see the effects of the wise and active 

 measures towards the eradication of this pest which are now being taken by the Depart- 

 ment of Agriculture and Arts of Ontario, rather than by purchasing from United States 

 nurseries to run the risk, however slight that may be, of bringing in more infested stock. 

 Every effort is being made to discover and wipe out all jases of infestation, and I feel 

 confident that, if energetic measures are adopted now, even the San Jose' scale, as it 

 now occurs in Canada, can be controlled. 



NINTH ANNUAL MEETING OF THE ASSOCIATION OF ECONOMIC ENTO- 

 MOLOGISTS, DETROIT, MICH., AUG 12-13, 1897. 



The Association met in room 212, Central High School building, immediately follow- 

 ing the adjournment of Section F. Thirteen active members were present, together with 

 many visitors, prominent among the latter being Dr. C A. Dohrn, Prof. E. B Poulton, 

 Dr. C. P. Hart, Dr. C. S. Minot, and Dr. C. W. Stiles The Association was called to 

 order by the President, and in the absence of Secretary Marlatt, Mr. A. H. Kirkland was 



