Fig. 31. 



BROWN CRAiNBERRY SPANWORM 



Eggs among litter from bog floor. Much enlarged. 



THE WORM 



In its early stages the worm is rather Hght brown with a whitish stripe along 

 each side and another along the middle of the back. The latter tends to per- 

 sist but becomes obscure as growth proceeds. 



The mature worm (Plate Three, figs. 7a, 7b, 8a and 8b) is somewhat over 

 an inch long and is grayish brown, varying greatly in shade, the under half 

 being lighter than the back and the back often having various indefinite mark' 

 ings of darker brown. A whitish stripe often runs along each side just below 

 the spiracles. The spiracles are orange-brown, rimmed with dark brown. The 

 body has no noticeable tubercles and is covered with a fine whitish or some- 

 times partly brown scurf, seen only with a good lens. The head is indented 

 only slightly and is chestnut brown, commonly marked with darker brown 

 across the top. 



The worms mature in late July and early August and change into the pupae 

 that pass the winter. 



Treatment 



June reflooding interferes enough with the progress of the moths onto a 

 bog and their egg laying there to prevent the development of an infestation 

 where it is practiced regularly. Complete flooding for thirty-six hours as soon as 

 the moths reach the height of their flight often very nearly eradicates a bad in- 

 festation, but this cannot be relied on. 



[41] 



