6 



FARMERS BULLETIN 





from the vines or dig them from the earth, and skmiks, snakes, and 

 toads frequently gorge on them. Domestic fowls, especially ducks 

 and guinea fowl, also are of assistance in suppressing this pest. 



HOW TO CONTROL THE COLORADO POTATO BEETLE. 



The Colorado potato beetle is not difficult to control, no other 



method being necessary than the free use of arsenical preparations 



(see figs. 5 and 6) and mechanical devices. 



The following procedm'e is advised when this 



,^ insect alone is to be combated. In the 



^T^ V l^s^ majority of cases, particularly in the North- 



I ' !^,1 Y*^ ^^^'^ States, the combined treatment outlined 



^' '^"1 I on page 18 should be followed. 



SPRAYING WITH ARSENATE OF LEAD. 



As a spray for the potato beetle and 

 similar pests, arsenate of lead, or lead 

 arsenate, serves the same purpose as Paris 

 green and its use for the last two years or 

 more shows that it is even more valuable than Paris gi'een. Con- 

 ditions incident to the great war have caused a scarcity of copper 

 compounds and the price of Paris gi*een is so high that it can not 

 be used economicallv. 



Fig. 4.— a ladybird (Hippodamia 

 convergens) which preys on the 

 eggs ofthe Colorado potato beetle. 

 JIuch enlarged. 



Fig. 5.— Field of potatoes showing outside row imsprayed in comparison to tlie remainder of the plat 

 spraj-ed for the Colorado potato beetle with Paris green, one-half pound to 50 gallons of water. 



