18 Circular 107 



The field spinach problem must be met by spraying, the active agent 

 being nicotine. At Norfolk, Virginia, a sprayer on the same order 

 as an engine-driven potato sprayer, with several nozzles has been 

 successfully used. 



Lice on spinach grown under glass, in cold frames or green- 

 houses yield to nicotine applications as set forth in treatment of to- 

 matoes. 



On the Cabbage Family 



The problem of controlling plant lice on cabbage, cauliflower, 

 turnips and other crops of the cabbage family is much complicated 

 by the different growth habits of the various kinds of crops. 



Lice on cabbage, if discovered promptly on their arrival, are eas- 

 ily controlled. On a garden scale the infestation may be destroyed 

 by wetting them well with nicotine, soap and water applied with a 

 knapsack or compressed air sprayer. On a field scale an engine- 

 driven sprayer, modified as recommended for potato, may be used. 

 In some cases the infested leaves may lie low enough to require the 

 use of a lifting apparatus, such as recommended for turnips. Cab- 

 bages in cold frames are sometimes seriously infested with lice. Un- 

 der these circumstances recourse should be had to tobacco smoke as 

 outlined for tomatoes under glass. 



If lice on cauliflower are destroyed when they first appear, the 

 methods outlined for cabbage may be successfully employed, but if 

 nothing is done against them until the plants have grown bushy con- 

 trol will prove difficult if not impracticable. 



In dealing with the problem on turnips it will be necessary to 

 utilize a lifting apparatus in connection with an engine-driven potato 

 sprayer. This lifting device is made on half-inch iron rods shaped 

 and attached to the sprayer as shown in figure 13. 



Turnips grown in gardens may be treated with a knapsack or 

 compressed air sprayer. In using either type of sprayer for this 

 purpose a one-quarter or a half-inch gas pipe extension rod should 

 be employed. This can be made by any plumber by cutting off a 

 piece of half-inch gas pipe sufficiently long to reach from the hand to 

 the ground and also in addition to allow for turning 2 to 2]/ 2 inches 

 of the lower end at right angles to the main piece. The end of this 

 turned up portion should be threaded for the attachment of the noz- 

 zle. With this sort of extension rod the spray may be delivered 

 against the under-sides of the leaves where the lice feed and repro- 

 duce. 



