iU2 THK EEPOKT OF THE No. 36 



into a green field and leave droppings and presently thousands of grasshoppers would 

 be there. That is where we originally got hold of the idea of using manure. I 

 should like to ask whether such fruit as lemons, or other substances attract the 

 grasshoppers in that way from a distance. 



Mr. Gibson: In a recent paper published in the Journal of Economic Entomo- 

 logy, S. J. Hunter and P. W. Claassen gave an account of a number of experiments 

 which they carried out in Kansas in placing out fruit juices to attract grasshoppers, 

 and they found that they would come very considerable distances, attracted by the 

 aroma of the fruit. 



The President: I was in Atlanta, Georgia, last year when these two papers 

 were read by Professor Dean and Hunter, and they dwelt particularly upon the fact 

 that it was the lemon that was the attractive quality, and they described, as you have, 

 how many feet they would travel to reach it. 



Mr. Griddle : I recently tried some experiments with sawdust in place of bran. 

 Sawdust can be obtained for practically nothing in our district. In the ordinary 

 way with salt added I got just about the same results as with bran. In Manitoba 

 the grasshoppers have a habit of coming to anything which you may be holding 

 attracted hy the salty flavour left through contact with the hands. That induced 

 me to try sawdust with salt added. It would be interesting to try further experi- 

 ments along that line. 



The President: The plan which Mr. Griddle has suggested would be very 

 useful in the Three Rivers District where you can get sawdust practically for noth- 

 ing, and it is difficult sometimes to get either bran or horse manure. That would 

 be a very useful thing for the farmers, and would cut down the cost considerably. 



Prof. Dearness : I noticed a question raised in the reports as to the different 

 kinds of fruit. It reminds me of the concession one of my pupils got at the World's 

 Fair for selling Orangeade. He told me that he used about three oranges per barrel. 

 The material he added to that was not directly allied to the oranges, and I think 

 there was some cheap material that was added to intensify the effect of the fruit. It 

 might be possihle, in order to obtain greater acidulation, to use some cider or soured 

 liquor of some kind. This might he experimented with with a view to getting 

 something which wonld attract these insects still further. If there is any particular 

 virtue in the lemon over the orange or banana, it would be either in the taste or in 

 the odor and it w^ould be a matter of experimentation to get something which would 

 be better than either. 



The President : Either Prof. Dean or Prof. Hunter did carry out experiments 

 with essential oils and chemicals of that kind which are the bases of the pungent 

 qualities of these fruits. 



Mr. King : I have used apples with the poison for the Fall Army Worm larvae 

 and they have travelled towards the place, but I do. not know whether that was due 

 to the apples. 



AN IMPORTED EED SPIDER ATTAGKING FRUIT TREES. 



By L. Caesar, 0. A. G., Guelph. 



In the autumn of 1912, when examining the leaves of European plum trees 

 that were severely attacked by what at first was supposed to be our common Red 

 Spider, Tetranychus himaculatus, though the mites themselves were not seen, my 

 suspicions wore aroused that it was some other mite and uot T. himaculatus that was 



