162 



THE REiPORT OF THE 



No. 36 



of the land, but by scattering it thinly here and there throughout the 'fields 

 sufficient of the bait will be distributed to attract the locusts from considerable 

 distances. In the preparation of the bait it is wise to guard against the breath- 

 ing of the fine particles of the Paris green. This may be avoided by tying a 

 handkerchief, loosely, over the mouth and nose. 



Dr. Fern'ald: I would like to ask if there were any experiments made as 

 to the variation in number of the oranges and lemons. 



Mr. Gibson: In every case we used only the three fruits to the 20 pounds 

 of carrier. 



Mr. Teeherne: In British Columbia we have a lot of range land. Last year 

 we had about 100 square miles destroyed by the Migratory Locust, M. ajfinis. I 

 would like to hear from Mr. C. P. Lounsbury on this. 



Lesser Migratory Locust, Melanoplus atlanis: a, b, young 



hoppers; c, adult male; d, adult female. 



(Author's Illustration.) 



Mr. Lounsbury: Our South African matters are so very different that I am 

 afraid there would be very little advantage in my discussing them. All our 

 work in South Africa for many years has been done with poisoned baits or spray- 

 ing. We use arsenite of soda more than Paris green because it is cheaper. 



We have never attained anything with the citrus fruits. Does the fruit 

 juice add much to the attractiveness of the bait? 



Mr. Gibson : The fruit juice is, of course, supposed to add to the attractive- 

 ness of the bait. We have never had any definite experiments to bear out this fact. 

 In the case of the new sawdust mixture containing salt alone, the salt is un- 

 doubtedly the attractant. 



Mr. Winn: If there are no further discussions on Mr. Gibson's paper I will 

 call on Professor Caesar to give his paper on " Apple Leaf-rollers in Ontario." 



