7 



BLACK-HEADED FIREWORM 



Fig. 5. Cranberry leaves with fruiting bodies of a fungus (Venturia compacta Pk.) often 

 mistaken by growers for its eggs. Much enlarged. 



Fig. 6. ^.arva. Considerably enlarged. 



Fig. 7. Moth. Much enlarged. (From U. S. Dept. Agr. Farmers* Bui. 860.) 



THE PUPA 



The mature worms generally leave the vines to pupate on the sand or in the 

 trash beneath them. The pupa often is naked but usually is in a light case of silk 

 and sand or fallen leaves. If water happens to be standing under the vines, the 

 worms pupate among the webbed foliage. They used to do this quite generally in 

 Wisconsin, probably because most of the vines there were poorly drained. The 

 pupa is light brown at first, but it gets almost black before the moth emerges. 

 The pupal period of the first brood is nearly two weeks, and that of the second 

 brood about a week and a half. 



THE MOTH 



The moth (fig. 7 and Plate One, fig. 6) is dark grayish brown and so small 

 that it is often mistaken for a fly when in flight. It expands somewhat over 

 three-eighths of an inch. The forewings are marked with graybrown and 

 silver'gray bands. The female may lay eggs within a day after it emerges. 

 The moths fly little during the day unless it is warm and very cloudy, but 

 they are flushed up easily. At dusk they fly and hover freely just above the 

 vines. 



{9] 



