68 



Mr, AV;ishl)uni thoiiylit it difiicult to accunitoly count the number 

 of broods in :i cliniiite like that of Oregon, with which .statement Mr. 

 Simpson fully concurred. 



Mr. Alwood, referring- to the statement made l)y Mr. Simpson of 

 the cost of 1 cent per tree for spray, desired to know the size of the 

 trees. 



Mr. Simpson explained that the trees were 8 3^ears old and much 

 larger than trees of this age in the East. These trees produced from 

 H to 20 l)oxes of apples, with a very good average of 10, a box equal- 

 ing approximately a bushel. The soda-lime arsenite was used. 



Mr. Burgess desired to know the cost and weight of the gasoline 

 sprayer tried ])y Mr. Simpson. 



Mr. Simpson stated that the cost was $320. The weight had never 

 been accurately taken so far as he knew. 



Mr. Fletcher stated that he had been much interested in Mr. Simp- 

 son's ol)servations in Montana. He constdered the duration of the 

 different Ijroods a very interesting- subject and thought that the fact 

 was established that there might be a considerable variation. He 

 questioned the possibility of drawing conclusions from orchard obser- 

 vations alone. Attention was called to the commonly noted occurrence, 

 by an3"one who had bred insects, that as large a proportion as half of 

 a brood might go over for a whole period, until the next time of the 

 regular occurrence of the species, and if such observations Avere made 

 in the orchard, wrong conclusions might be drawn. He did not con- 

 sider it desirable that entomologists should speak of a partial brood. 



Mr. Osborn stated that in determining the number of broods he 

 considered that if the average time of appearance in greatest alnin- 

 dance wm-e taken, results w^ould be much more reliable as a basis for 

 determining the number of broods. He mentioned a case where the 

 codling moth appeared as late as the latter part of June from apples 

 stored in a cellar where it was rather cool and development was 

 retarded. 



Mr. Marlatt said that he was very nuich interested in Mr. Simpson's 

 confirmation of the feeding of the larvte on the leaves, and not only had 

 this been confirmed, but our knowledge of the extent of such feeding- 

 had been much increased. The work of some earlier experimenters 

 and observers had demonstrated that codling moth larvie would feed 

 on leaves, but that they did it normall}' and to a considerable extent 

 in nature had not previously been so fully demonstrated. He thought 

 this Avas a very interesting- feature of Mr. Simpson's work. It indi- 

 cated that the poison catches the caterpillar very f requentl}^ on the 

 leaves, especially as it has l)een shown that a considerable percentage 

 of the eggs are placed on the leaves. When one comes to think of the 

 matter it is not at all surprising that the young larvte will feed on the 

 leaves. Before entering the fruit they normally work two or three 



