398 



ECONOMIC ENTOMOLOGY 



(b) Special Crops. — Such crops have been found advantageous in 

 the control of Hessian fly, army worms, squash bugs, cucumber beetles, 

 and asparagus beetles. In the case of the Hessian fly narrow strips 

 are planted early so that the flies may deposit their eggs on the wheat 

 before the regular planting of the field. These trap strips are then 

 destroyed. With the army worm, a similar narrow strip on the 

 border of the field may be poisoned with an arsenical spray. With 

 cucumber beetles and asparagus beetles, a few 



plants may be set apart to trap the early beetles 

 nd then destroyed. 



(c) Poison Baits. — Such are very effective against 

 grasshoppers, cutworms and other insects. The 

 Criddle Mixture, made by mixing thoroughly i lb. 

 of Paris green or white arsenic, i lb. of salt (dis- 

 solved in water), and 15 gal., by measure, of fresh 

 horse droppings, with sufficient water to make the 





Fig. 253.— Tool 

 for cutting cards of 

 tarred building paper. 

 (After Slingerland.) 



Fig. 252. — Wood form for cutting hexagonal disks 

 for the cabbage-root maggot. {After Brilton.) 



whole mass moist but not soggy, is used in the West against grass- 

 hoppers. When the mixture is scattered about grass lands and the 

 edges of grain fields in hot, sunny weather the grasshoppers are readily 

 poisoned. 



Another bait, first used in Kansas against grasshoppers, is now 

 usually employed against cutworms, army worms and grasshoppers. 

 The formula is: i lb. Paris green, 20 lb. wheat bran, 2 qt. of cheap 

 molasses, the juice and pulp of 3 oranges or lemons, and 2 to 2}^ gal. 

 water. The bait, sown broadcast in early morning, will show results 

 in a few days. 



