248 



Nature- Study Agriculture 



Lime 

 sulfur 



Formalin 

 and 



bichlorid 

 of mercury 



Various 

 fungous 

 diseases; 

 peach 

 blight and 

 curl leaf 



A spray that is very commonly coming to be used in- 

 stead of Bordeaux mixture is lime sulfur. On account 

 of the difficulty of making this in small quantities, it is 

 usually purchased ready mixed. Lime sulfur is an 

 insecticide as well as a fungicide. It is useful for killing 

 scale insects. 



Two very important fungicides, which are used to 

 disinfect seed to be planted, are formalin and bichlorid 

 of mercury. Formalin, a liquid, is mixed with water 

 at the rate of one pint to thirty gallons of water. 

 Bichlorid of mercury is most conveniently used in 

 the form of tablets as sold by druggists. These 



tablets differ in size, but 

 enough of them should 

 be dissolved in water to 

 make a one-to-one-thou- 

 sand solution. Direc- 

 tions on the bottle will 

 explain how to do this. 

 Bichlorid of mercury is 

 extremely poisonous and 

 should be handled only 

 with the greatest care. 



Peach blight is a fun- 

 gous disease that kills 

 the peach buds during 

 winter, so that few leaves 



W.T. Stilling f rm 5 ^ " CUrl ^ " 



FIG. 199. Curl leaf of peach. If the tree makes the leaves CUrl 



from which this twig was broken had been and drop off . For blight 

 sprayed with Bordeaux mixture, these 



leaves would be sound. Spray With Bordeaux 



