26 MANUAL OF VEGETABLE-GARDEN INSECTS 



extension rod about 20 inches long, furnished with a Bordeaux 

 or Vermorel nozzle, preferably the former. The pump should 

 be able to maintain a pressure of at least 125 pounds. With 

 this arrangement three men are needed, one to drive the horse 

 and two to carry the nozzles. Attempts to use a potato 

 sprayer with fixed nozzles have been unsuccessful. A stiff 



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Fig. 24. — Spraying for the cabbage aphis with a traction potato-sprayer 

 and two leads of hose. 



spray should be used, directed downward into the center of the 

 plant. With sufficient force it will be driven into many of the 

 curled leaves and w^ill reach the lice. 



If the plants become infested with lice in the seed-beds, 

 they should be dipped in a solution of whale-oil soap, 1 pound 

 in 8 gallons of water, before transplanting. The roots should 

 not be wet with the solution and the plants should not be left 

 in the sun after dipping for fear of burning. 



Reference 

 Cornell AgT. Exp. Sta. Bull. IJOO. 1911. 



