206 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



an old clover-field under in October or November or in early 

 spring, then harrow and roll. These practices operate at the 

 same time against several other clover pests." Folsom. 



The Clover-hay Worm * 



The Clover-hay Worm attacks stacked or stored clover, par- 

 ticularly where it is held over a year or where placed on old hay, 

 eating much of the lower layers and rendering it unfit for food. 







FIG. 171. Clover-hay worm, greatly enlarged. (After Folsom.) 



It has been known to be injurious from Kansas eastward, but 

 occurs throughout most of North America, as well as parts of 

 Europe, Asia, and Africa. 



FIG. 172. The clover-hay worm moth, wings expanded (after Folsom) and 

 at rest (after Pettit) enlarged. 



"The larvae attack the bottom of a clover stack to a height 

 of 2 feet or more from the ground; similarly, in the barn, they 

 occur next the floor. They interweave the hay with white silken 

 webs, intermixed with black grains of excrement. . . ; they 

 reduce much of the hay to chaff, and their webs give the hay 



* Hypsopygia costalis Fab. Family Pyralididce. 



