92 PHYSIOLOGICAL RELATIONS 



Precautionary measures. Among the fungicides discussed arsen- 

 ical poisons have not been included for the reason that they are 

 supposed to be of importance only in the control of insect pests. 

 Frequently it becomes desirable to combine an arsenical compound 

 — Paris green, for instance — with Bordeaux mixture, and thus 

 accomplish a double purpose. In that case more than a pound of 

 lime, additional, should be included in the Bordeaux for each 

 pound of the Paris green employed, otherwise injury may result. 



The lime-sulfur mixtures are now receiving attention through- 

 out the country, and there are indications that they may become 

 important. Experiments thus far show that the ordinary lime-sul- 

 fur wash is much more toxic to sensitive foliage than the " self 

 cooked." Growers should therefore clearly distinguish between 

 these preparations. Moreover, the ordinary lime-sulfur is a kind 

 of whitewash, and if employed when the fruit is approaching 

 maturity, it may be objectionable in marketing. 



