136 THE EEPORT OF THE No. 36 



-a means of control for the leaf -roller it they are intelligently and thoroughly 

 applied. Such has also been the experience and conclusion of Gill in Colorado, 

 Childs of Oregon, and Weldon, iu Colorado and California. 



i Conclusions and Eecommendations. 



The leaf-roller is difficult to control because of its habit of hiding in the 

 opening buds' or in rolled leaves. Thorough spraying with arsenate of lead in 

 heavy proportions has not proved effective in cases of severe infestation, either in 

 Xew York or in the Western States. 



Extended experiments show that the eggs of the leaf-roller are susceptible to 

 the effect of miscible oils, which, when thoroughly applied, have destroyed from 74 

 to 92 per cent, of the eggs. In Colorado, New Mexico, and Oregon, where these 

 oils have also been used extensively, even a higher proportion of the eggs have been 

 destroyed. In experiments made during the last three years no injury has resulted 

 from the use of miscible oils. The oils have been applied in the spring (April) at 

 as near the active growing period of the tree as possible, but always before the buds 

 burst. They have been used generally at the rate of 1 gallon to 15 gallons of 

 water. Only one application should be made and that on a day when the tempera- 

 ture is above freezing. 



In cases of severe infestation the oils shoujd be supplemented by thorough 

 sprayings with arsenate of lead at the rate of 6 pounds to 100 gallons of water or 

 of lime-sulphur solution. At least one application should be made before the 

 blossoms open, and another after the petals fall; the latter will serve also as the 

 regular spraying for Codling Moth. In lightly ]nfested orchards spraying with 

 miscible oils may be omitted and reliance placed on thorough applications of 

 arsenate of lead, at the rate of 6 pounds to 100 gallons of water or lime-sulphur 

 solution. One or two applications should be made before the blossoms open and 

 another after the petals fall. 



Dr. Hev^^itt : It is always a very pleasurable duty at the conclusion of these 

 meetings to thank our hosts, and I have much pleasure, therefore, in moving that 

 the very hearty thanks of the Society be tendered to the President of the College 

 and his staff for the generous hospitality which lias been extended to the Society, 

 both in providing for the meeting place for the Society and for our entertainment 

 in the dining hall, and to the President of the Students' Council who so kindly 

 added to the social enjoyment of the members. I think I am voicing the senti- 

 ments of all the members who are present when T say that this meeting has been 

 extremely enjoyable from the social point of view from the fact that wo have been 

 permitted to lunch in the dining hall — which I may say we hope is a custom which 

 will be continued in future years. It has added greatly to the convenience of the 

 meeting, and to the opportunity of different members meeting each other, and also 

 for the very enjoyable entertainment last night which was afforded us. May I 

 also say how gratifying it is to the visiting members to find Dr. Bethune in such 

 excellent health and still carrying on his work. It is a great pleasure to have 

 him still taking an active part in the meetings, -and I hope that pleasure will be 

 continued for many years to come. 



Prof. Lochhead: I should like to second that motion proposed by Dr. 

 Hewitt. I have especially enjoyed my visit here. I have looked forward to it for 

 some time, and it is like coming home again to come back here and meet old 

 friends. Of course the student body is different from my time, but there are a 

 sufficient number of familiar faces left to remind me of my old days here. I am 



