Proceedings. 1923 181 



and 7.")', of the puj);)! eases were fdi-iiied on the main trunk and erotches 

 two feet from the soil surface. An unusual record was obtained from a 

 pupa formed on July 13th, from a larva which had possibly been starved, 

 and M-hieh formed its moth on July 21st. 



In 1919 second generation larvae formed pupae on July 23rd, and 

 moths emerged on August 4th. On August 5th, field observations showed 

 2.1% pupation; on August 19th 75%. Full-grown larvae were taken on 

 September 4th. Moths were commonly observed in the orchards on 

 August 19th and tlironghout tlie month. Laboratory material yielded 

 moths until the elose of Sejitember. 



The second oviposition period of the year followed shortly after 

 the appearance of moths, and eggs, although only seen at various times, 

 must have been freely laid in both years, from the middle of August 

 until October. 



The larvae arising from these eggs enter the liark, foi-m hibernacula 

 and ])ass the winter with an average length of 2.5 mm., although some 

 may be 4 mm. and a few as much as 5 mm. in length. 



These young larvae luidoubtedly feed to some extent before entering 

 winter quai'ters, as they may be quite commonly seen feeding on mature 

 peach fruit or on leaves during the latter part of August and in Sep- 

 tember. Hibernacula were formed and inhabited on August 20th and 

 at all periods between this and autumn. 



There is no doubt that two generations occur in a year, although 

 it is true, in certain seasons, the second generation may not be quite 

 complete. 



The Control by Spraying 



The matter of control by lime sulphur and lead arsenate applications 

 before and after blossoming have been laid down already in the circular 

 previously mentioned. The following notes are suiijilementary to the 

 circular : 



On April 10th. 1918, at Kaleden, when the apricot l)uds were well 

 swollen and purjile, lime sulphur (1-9) spraying was in full "operation. 

 Triple.x power machines with "gun'' nozzles were employed, and certain 

 sections of an orchard were personally thoroughly sprayed at 200 lbs. 

 pressure, with particular spray direction into the erotches of the finer 

 twigs, the work being done from the machine and not from the ground. 

 On April 16th, and on succeeding days, it was found that a larger per- 

 centage of larvae survived than was expected. Some larvae were unques- 

 tionably destroyed in their burrows, for between April lOth and Kith 

 the majority of the larvae in. 1918 were still in winter (juarters, though 

 signs of activity wi-n^ noticed in the presence of fresh frass and some 

 larvae had migrated to the buds. Other lai-vae freshly destroyed were 

 found in the terminal buds, indicating either that tln' solution penetrated 



