176 



THE PRINCIPLES OF AGRICULTURE 



297a. The Paris green mixture is compounded by using Paris 

 green 1 pound, water 150 to 300 gallons. If this mixture is to 

 be used upon fruit trees, 1 pound of quicklime should be added. 

 Repeated applications will injure most foliage, unless the lime is 

 used. Paris green may be added to Bordeaux mixture. 



2976. Arsenate of lead is now much used for chewing insects. 

 This can be applied in a stronger mixture than other arsenical 



Fig. 72. The spots of hollyhock rust, a fungous disease. 



poisons without injuring the foliage. It is, therefore, much used 

 against beetles and other insects that are hard to poison. It comes 

 in the form of a paste and should be mixed thoroughly with a small 

 amount of water before placing in the sprayer, else the nozzle 

 will clog. It is used in strengths varying from 4 to 10 Ibs. per 

 100 gallons, depending on the kind of insect to be killed. 

 Arsenate of lead and Bordeaux mixture can be combined without 

 lessening the value of either. 



297c. The lime-and-sulfur wash, for scale insects, is now 



