268 Report of the Entomologists of the 



ture. This not only makes the vines offensive, but the applica- 

 tion of it drives the beetles away from them. Its use gave just as 

 good results as air-slaked lime; besides it had the advantage, 

 when employed at the rate of four pounds of copper sulphate to 

 forty-four gallons of water, of not injurying or stunting the vines 

 in the least. Furthermore, it can be more uniformly applied to 

 all parts of the vines and it adheres better than air-slaked lime. 



(2) Air-slaked lime. — Dusting the plants with air-slaked lime 

 has long been recommended and often proves quite successful for 

 driving the beetles from the vines as well as being distasteful to 

 them. But, in order to prove successful, the beetles must not 

 occur in large numbers ; must have passed their first feeding period 

 and commenced to pair, or other food plants must be plentiful. 

 Tests during two years convince me that generally the use of air- 

 slaked lime, without a bait crop, causes the beetles to work down 

 next to the root and gnaw at the stems below the surface. It is 

 also liable to be too caustic and stunt the vines. Some have 

 recommended the use of Paris green with air-slaked lime. Tests 

 of this have resulted the same as in the use of Paris green with 

 Bordeaux mixture, viz. : no beetles could be induced to feed upon 

 the parts of the plants protected with the lime and Paris green. 



(3) Other remedies. — The following mixtures and remedies 

 have been tested along with air-slaked lime : Kerosene mixed with 

 air-slaked lime, turpentine mixed with air-slaked lime, kerosene 

 mixed with land plaster, turpentine mixed with land plaster, rags 

 and corn cobs dipped in kerosene and placed near the plants, and 

 tobacco dust. 



The first four gave no better results than air-slaked lime used 

 alone. Land plaster had the advantage of not stunting the vines. 

 Kerosene used on rags and corn cobs, which is said to smell so 

 bad that the beetles will not stay in the same field, was of no value 

 whatever. Tobacco dusted on the leaves and placed around the 

 base of the plants to the depth of one-fourth inch was of no value 



