1920 ENTOMOLOGICAL SOCIETY. 25 



The first is C. obtusa Germa, or the Alder Spittle insect. This has four 

 varieties and is common. It feeds upon the Alder. 



C. proteus has three varieties. It feeds upon the dogwood, cranberry and 

 blueberry. 



They are called hoppers because of their remarkable jumping habits. They 

 are generally found on the boughs of trees or standing on the stalks of flowers, 

 especially the golden rod. They are very shy and when approached they slide 

 around to the other side and they keep out of sight. 



MY EXPERIENCE THIS Y^EAR IN DUSTING AND SPRAYING 



(1919). 



Father Leopold, O.C.R., Oka, Que. 



Y^our kind President, Mr. Caesar, insisted that I give you a paper this year, 

 and I thought it would interest you to know of our work at the Oka Agricultural 

 Institute in dusting and spraying during the past season. 



The Orchard. The following remarks are limited to one of our orchards 

 only, the most uniform we have to carry on a commercial experience in dusting 

 and spraying : Our Wealthy orchard, situated on a gentle slope with a south-west 

 exposure. It is not the best exposure for our Province, but we seem to get good 

 results with this particular orchard. 



I chose 30 TOWS of this orchard, as you can ascertain in looking over Table I, 

 so as to have a complete row of 11 trees separating each plot which number 6 in 

 all, three plots sprayed and three plots dusted. Remember that the 6 plots are aJI 

 in the same orchard, on the same site, the trees all the same age, 30 years old,, 

 and all the operations made on the same day. We could not get more uniform 

 conditions, considering also that the bloom on each plot was quite uniform. 



Bloom. Looking over Table I, we may see that in plot I, 4 trees only out 

 of 44, did not bloom and 23 were in full bloom ; in plot II, 10 trees did not bloom' 

 and 18 were in full bloom; in plot III, 11 did not bloom and 16 were in full 

 bloom; in plot IV, 11 also did not bloom and 11 were in full bloom, while 18 had 

 half to three quarter of a full bloom ; in plot V, only one tree did not bloom, while 

 21 were in full bloom; in plot YI, 4 only did not bloom and though three only 

 were in full bloom, 15 had from one half to three quarters of a full bloom. 



Object of Experience. I insist somewhat on the fact that the greatest 

 part of each plot had trees in bloom, as the first object I had in view, was to- 

 determine the action of liquid Lime-Sulphur on the apples in comparison with 

 the action of liquid Bordeaux mixture on the same. I did not care what were 

 the results as far as scab is -considered. Wealthy apples not being very subject 

 to scab. 



The second object I was after was to determine just what the cost was in 

 comparison of the dusted plots, per tree, with the sprayed plots. I have carefully 

 gone over this in Table VIII. 



I did not intend to tabulate the results of each plot separately in picking 

 and classifying the crop, as this would have entailed too much work, for a com- 

 mercial experiment. But, by going over the entire orchard, plot by plot, we had 

 a very good idea of the results per plot. 



