126 INSECTS OF ECONOMIC IMPORTANCE 



early spring they lay eggs in the clover stems; these 

 hatch and the larvae mature in 29 to 58 days ; each 

 one spins a lace-like cocoon among leaves or rub- 

 bish on the ground; the pupal stage lasts 6 to 14 

 days and the weevils of the new generation begin 

 to appear in June ; these lay some eggs in the fall. 



Control — Spray fields as soon as the weevils 

 begin feeding in April with arsenite of zinc, 4 

 pounds to 100 gallons and put from 50 to 100 gal- 

 lons on an acre; cut first crop by middle of May; 

 brush-drag field to kill weevils. 



Clover seed-caterpillar ^^ (Enarnionia 

 interstinctana) 

 Order — Lepidoptera 

 The caterpillars of this moth eat out cavities in 

 the heads of clover and often become very destruc- 

 tive ; there are three broods a season ; probably pass 

 the winter as larvas occasionally, usually as pupae. 



Control — Cut and store hay crops early in June ; 

 do not allow clover to run more than two years; 

 pasture clover in fall of first year. 



Clover hay-worm -^ (Hypsopygia costalis) 

 Order — Lepidoptera 



This hay-worm works in stacked or stored clover, 

 eating much of it and contaminating much more 

 with webs of silk and particles of excrement, mak- 

 ing the hay unfit for fodder. 



Control — In a barn, old hay should be removed 

 and burned if infested; a stack should be raised 

 above the ground on old logs or rails; salt bottom 

 of stack up two or three feet. 



OTHER INSECTS INJURIOUS TO CLOVER 

 AND ALFALFA 



Clover leaf-midge (Dasyncura trifoUi). 

 Clover stem-borer {Langiiria mozardi). 



