Stage 



Jon- Mor 



Apr 



May 



Jun 



Jul 



Aug 



Sep 



Oct- Dec 



Egg 



1st Instar 

 2nd Instar 

 3rd Instar 

 4th Instar 

 Pupa (Overwlnte^ 

 Adult 







^S^<^<^ 



^« 



i^K 









0^ 





^«S 









'^1 



.«« 



^ 





^S# 



Figure 5. --Life History of the spear -marked black moth, Mile 302, 

 Richardson Highway, Alaska - 1958. 



A small population increase was detected around Ketchikan in 1958. In 1959 

 high populations of these two insects were found in Cholmondeley sound, Kasaan 

 Bay and Portland Canal. It is probable that this condition exists over most of 

 this general area. 



FOREST MANAGEMENT RESEARCH 



^ Seed Dissemination and Natural Stocking --Station Paper No. 12, "Natural 

 stocking of a mile-square clear cutting in Southeast Alaska", is a progress re- 

 port on studies to determine seed dispersal distance and the development of 

 natural reproduction in a large clear cutting. Adequate natural stocking of clear 

 cuttings in Alaska is partly determined by size and shape of the cutting. Amount 

 and dispersal distance of seedfall are important factors determining the effect- 

 iveness of size and shape. 



A study on an experimental 700 -acre clear cutting near Hollis, Prince of Wales 

 Island, shows that the amount of seed dispersed into the cutting decreases 

 rapidly from the edge of the uncut timber (fig. 6). 



13 



