66 



MASS. EXPERIMENT STATION BULLETIN 239 



Cranberry Sawfly."" 



Tliis species occurs only on dry hogs and hogs tliat are not reflooded regu- 

 larly. It hardly ever attracts attention, hut its long feeding i^eriod prohahly 

 sometimes allows it to do considerahle harm. It is one of tiie minor drains 

 that must be checked to make cranberry culture efficient. 



Cranberry Sawfly. 



Fig. 66. Cocoon and female fly. Much enlarged. 



Fig. 67. Cranberry leaf with egg-pockets. Much enlarged. 



Fig. 68. Worm. Much enlarged. 



hl.^tributloti (mil Food Phnils. 



This insect has been found in Massachusetts, New York, New Jersey, Illinois 

 and Wisconsin. Cranberry is its only known food plant. The worms scallop 

 the leaves irreiiularlv. 



Description 'tvil Seasonal Histort/. 



The worms winter in rather tough cocoons of coft'ee-brown silk (fig. 66) 

 among the trasii on the bog floor, unharmed by the winter flood. They pupate 



69. Prisliphora idiola Norton. 



