October, 1929] WHITE PINK WEEVIL 31 



ments being 9.3 days in the insectary cage and S.6 days in the greenhouse. 



Lar\-ae may be found from the last of May to the middle of September. 



The larval stage varies from 26 to 41 days, the average being 36.1 days 

 in the cage and 33.4 days in the greenhouse. 



The pupal period extends from the middle of July to the last of Sep- 

 tember. 



The pupal stage varies from 9 to 20 daj'S, the average being 13.9 in the 

 cage and 12.2 in the greenhouse. 



Total development reciuired an average of 56 daj'S in the cage and 

 52.7 days in the greenhouse. 



The newly-emerged adults remain in the leader for several weeks. 



Newly-emerged adults feed in the region of new growth before hiber- 

 nating in the duflf. 



Observations on Pissodes approximatus Hopkins are given. 



Lime-sulphur (1-8) may be of value in control. 



Mixed stands of white pine and other conifers or hardwoods when pro- 

 perly grown will show reduced weeviling. 



Dense planting at the rate of 1800 trees to the acre will materially re- 

 duce the percentage of infestation. 



Lonchcea corticis Taylor, a dipteron predator, is the most important 

 natural control factor in Xew Hampshire. 



