TOMATO DISEASES 



137 



Bordeaux left over from the previous day. An old 

 mixture or one made from the concentrated solutions 

 has a poor physical condition. It settles more quickly, 

 tends to clog the nozzle and does not adhere so well 

 to the foliage. Failure to use the strainer results in 

 endless trouble in the field from clogged nozzles. 



FIG. 42 — PROPER WAY TO MAKE BORDEAUX 

 (From W. G. Johnson) 



When much spraying is to be done it is more con- 

 venient to keep the bluestone and lime in separate 

 permanent stock solutions, as shown in Fig. 42, con- 

 taining 2 pounds to the gallon of their respective in- 

 gredients. These will keep indefinitely, if the water 

 evaporated is replaced, and may be used from as 

 needed. 



Spraying apparatus. — Tomato growers having only 

 a small area to spray may use one of the numerous 

 forms of hand-pumps or bucket sprayers now on the 



