346 



GENERAL SCIENCE 



and may do much damage (Figure 308). It may live in 

 the soil over winter ; in such cases the only remedy is a 



U. S. Dept. of Agriculture. 

 FIG. 307. Suitable Spraying Outfit for a Small Orchard. 



rotation of crops. If the soil is free from the fungi, the 

 disease may be avoided by soaking the seed potatoes for 

 an hour in a solution of formaldehyde, one pound of 



formaldehyde to 

 thirty gallons of 

 water. 



Chestnut canker 

 is a fungous plant 

 which was only re- 

 cently introduced 

 in this country, 

 probably from 



Japan (Figure 309). 



As the plant de- 



Ohio Agricultural Experiment Station. 

 FIG. 308. Potato Scab. 



