FLEA-BEETLES 337 



is passed. Bordeaux mixture has been found the most efficient 

 and inexpensive deterrent for most flea-beetles. The presence 

 of this material on the leaves makes them distasteful to the 

 beetles. When combined with paris green, 2 pounds in 100 

 galbns, or arsenate of lead (paste) at the rate of 4 or 5 pounds 

 to 100 gallons, it makes the most effective treatment. As 

 bordeaux mixture is used on many plants for the prevention of 

 fungous diseases, its use serves a double purpose. In some 

 cases in which the plants are started in seed-beds and then trans- 

 planted into the field, dipping the plants in arsenate o'f lead 

 (paste), 1 pound in 10 gallons of water, before setting has been 

 found the most effective way of protecting from flea-beetle 

 attack. When the injury is done to the plants in the seed-bed, 

 it is sometimes found advisable to screen the beds with cheese- 

 cloth or tobacco-cloth as described under the cabbage root- 

 maggot on page 35. Special methods of treatment applicable 

 to certain species will be found in the account of these forms. 



