1922.] PUBLIC DOCUMENT — No. 31. 21 a 



Project 9. "Number of generations of codlino- moth in 

 Massachusetts as related to advisability of spraying for the 

 second generation." 



Assistant Professor Boukxe. 



This project consists of observations on the development of 

 second generation codling moths in the different climatic 

 areas of Massachusetts. 



Project 10. "Hatching dates for scale insects." 



Assistant Professor Bourne. 



This project takes in all of the more important scale insects, 

 and attempts to determine hatching dates as affected by 

 seasonal developments. It is hoped that a service of the proj- 

 ect may be the establishment of dates on which spraying for 

 certain of these scale insects may be effectively practiced. 



Cranberry Station. 



Project 1. "Injurious and beneficial insects affecting the 

 cranberry." 



Professor Franklin. 



Dusting with lead arsenate as a control for gypsy-moth 

 worms in their early stages was tried on two bogs with satis- 

 factory results. The green spanworm was more prevalent than 

 for many ye.ars, destroying the promise of a fine crop on two 

 areas of fifty and twenty-five acres in Rochester, and on an 

 area of two or three acres in Carver. Life history studies on 

 this insect were continued. The brown spanworm practically 

 disappeared as a cranberry pest this past year. The fruit 

 worm was more destructive than for several years. Its hatching 

 date was later than usual. Extensive examinations and counts 

 proved that the common parasite was abundant. Wetting of 

 the cocoons with a solution of sodium cyanide was tried as a 

 possible new method of control. 



