— ii3 — 



much to reduce the numbers of the pest. Our experiments on 

 many infested branches show that those not reached in this way, 

 that is the pupae in cocoons attached to the larger branches and 

 to the trunk, can be destroyed by the application of a strong kero- 

 sene emulsion, about one part of the emulsion to two or three 

 parts of water. The pupae are destroyed by the oil which soaks 

 through the cocoons. A weaker emulsion failed to penetrate the 

 cocoons. But a small amount of pure kerosene applied in a fine 

 spray killed every pupa ; and as the oil evaporated in a few hours, 

 it is quite probable that the dormant wood was not injured. Still 

 I am unwilling to advise the use of kerosene in this way before 

 trying further experiments. And I believe that a more practicable 

 method of fighting the pest is suggested by the fact that during 

 the greater portion of its larval existence it feeds exposed on the 

 surface of the leaves. If therefore the infested trees be liberally 

 sprayed with Paris green water during the latter half of June the 

 larvae will be poisoned. 



III. INSECTS INJURIOUS TO CHERRY. 



THE CHERRY-TREE TORTRIX. 



Cacoetia cei^asivcrana. 



Order Lepidoptera ; family Tortricidae. 



Large nests, each formed by fastening together with silk all of the leaves 

 and twigs of a branch of choke-cherry or sometimes of cultivated cherry, 

 and containing active yellow larvse, which develop into brownish moths 

 in July. 



In June and July there are often found on choke-cherry and 

 sometimes also on the cultivated cherry, large nests at the ends of 

 the branches, of the form shown in Fig. 7. Each of these 

 nests is formed by fastening together with silk all of the leaves 

 and twigs of a branch. Within this nest there lives a colony of 

 larvae, feeding on the inclosed leaves This colony consists of all of 

 the offspring of a single moth, which working together make a com- 

 mon nest. The larvae when full-grown measure about five-eighths 

 of an inch in length. They are lemon yellow in color, and clothed 

 with a very few fine yellowish hairs. The head, a shield on the 



