6 LEAFLET 2 12, U. S. DEPARTMENT OF AGRICULTURE 



Figure 5. — Effect of humus on land infested with the sand wireworm: A, The 

 spot in the center of the picture, with normal growth of corn, is where a hay- 

 stack stood during the previous fall and winter. Much of the hay which was 

 in contact with the wet ground rotted and was plowed under. B, The spot with 

 normal growth of corn is where oats were threshed the previous year and a 

 large quantity of the remaining litter was plowed under. The corn surround- 

 ing this spot is severely stunted by wire worms. 



sufficient, but when the land is heavily infested it may be desirable to 

 rest a field for two successive seasons. Such fields may be used satis- 

 factorily for pasturing. 



Growing Resistant Crops 



Some crops are less susceptible to wireworm injury than others, 

 either because of their ability to withstand the attack or because of 

 the time the crop is planted. 



