420 STATE BOARD OF AQRICULTURE. 



beneath in order to hit any large proportion of the lice. Several de- 

 vices have been made for bringing about this result. The spray most 

 efficient is the ordinary 40 per cent nicotine-sulphate, used at the rate 

 of 1 pint to 100 gallons of water with 3 or 4 pounds of laundry soap 

 added. When expedient one may use the nicotine-sulphate in bordeaux 

 (without soap). , 



Fig. 9. Potato leaf showing hopper-burn. 



The Gray Field-Slug,— {Idmax agrestis) of Europe has finally become 

 established in Michigan. It is a snail, less than % inch long, without 

 a shell, and it flourishes in moist places, feeding mostly at night on 

 lettuce, celery, potatoes (the tubers) and other vegetables. Poison 

 bran bait is the best that can be done for it at this time. Scatter the 

 bait in the vicinity of plants to be protected. (The Giant Slug is also 

 present in Michigan but has not become widespread as yet). 



Potato Leaf-Hopper,— the tiny, active leaf-hopper of potatoes is the 

 cause of hopper-burn, also known as tip-burn. This insect is easily 

 killed, before it gets its wings, when hit by a spray of nicotine-sulphate 

 but in our fields adult winged individuals are constantly coming in,— 

 just about as fast as we can kill them— we have no entirely satisfactory 

 repellant but probably the best that we have is bordeaux. A coat of 



