20 



BULLETIN 1032, V. S. DEPARTMENT OF AGRICULTURE. 



' Because of the overlapping of the generations, one can scarcely do 

 more than speculate as to the date of occurrence of the stages of the 

 second and third generations on the bogs ; and the latest dates of the 

 occurrence, particularly of the moths of the first generation and all 

 the stages of the second and third generations, could only be obtained, 

 therefore, by rearing methods. 



NATURAL ENEMIES. 



parasites. 



Insects. 



Although numerous very small wasplike insects (members of the 

 order Hymenoptera) can be seen flying over the tops of the vines on 



y^tTT.3 6 o la ^ 6 9j2/aT3 e s ie ^ 6 ajziais 6 9/2^6 ^J^M7^ 



Fig. 10.- 



-Egg deposition by blackhead fireworm moths of the first generation, 

 every three hours from July 15 to 20 ; Seaview, Wash., 191S. 



■jcIyzi 

 Records 



badly infested bogs on warm, clear daj^s, none of these could be reared 

 from collections of the eggs and lar^'se of Rhopohota naevana from 

 various bogs. Circumstances indicate very strongly, however, that the 

 blackhead fireworm on the Pacific coast is parasitized, to a certain ex- 

 tent at least, although not as much as on some dry cranberry bogs in 



the East. 



Fungous Disease of the Pup^s:. 



From about the beginning or middle of August it is v^ery common 

 to find, especially on the older and more badly infested cranberry 

 bogs, areas of 3 to 5 inches or more in diameter of old leaves beneath 

 the vines which have the appearance of being smeared with a floury- 

 Avhite substance. Closer examination of these areas will show that 

 this whitish appearance is due to the fruiting growth of a para- 

 sitic fungus,^ which attacks and kills the pupae concealed in their 

 cocoons in these old leaves. This fungus is shown growing from the 



" Detei-mined by Dr. A. T. Speare, of tlie Bureau of Entomology, as a species of Spicaria. 



