372 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 14 



looked old infestation and the new infestation much easier to locate, 

 but neither it nor the emulsion prevented egglaying or injured the 

 eggs after they were laid as there is considerable new brood in the bark 

 at the present time. 



Cutting into the bark after the worms appears to make the tree more 

 attractive to the female when she is looking for a pla^e for her eggs. 

 The usual control therefore, while it may destroy all of the infesting 

 larvae, is apt to leave the tree in a specially attractive ::ondition for 

 succeeding generations. To overcome this diffi2ulty, to reduce the 

 cost and to give better control for valuable trees, a new method has 

 been suggested by the writers experience with the cage mentioned in 

 the first pai^t of this article. 



Such a "knock down" cage with a light wooden frame work, gal- 

 vanized wire screen walls with a door in one nde ard a burlap or can- 

 vas top can be built for the average California tree at a total cost of 

 about !|i)25.00. It should be put up about May 1st and kept up until 

 the last of Juty. It will catch all of the rmths that emerge from with- 

 in and will prevent the egglaying of those from without. As long as 

 the tree is infested and the moths em.erge some one should visit the 

 tree at least once a day to catch and kill those that have emerged. As 

 they are moderately large and usually fly to the screen and remain 

 quiet they are easily seen ard captured. 



Our records indicate that even where a tree is heavily infested it is 

 not often that males and fem.ales emerge the same day and that when 

 they do the males either are not sexually mature or at least are not at- 

 tracted to the females from their own tree. There is thus practically 

 no danger of reinfestation from within if the moths are taken once a 

 day. 



As a tree that has been infested once remains attractive for some 

 time it should be caged every year for several years after all moths 

 have emerged from the trunlc. Once a cage has been bmlt it will last 

 for a ntimber of years and might as well be used to protect the tree un- 

 til it wears out. The cost of putting it up, taking it down and caring 

 for it will be far smaller than the cost of any other method now known 

 for the control of a heavy infestation of the carpenter worm in large 

 valuable trees. 



