I-9Q5-] 



Potato Scab. 



735 



If scabbed potatoes are used for " seed " without having been 

 sterilised, the resulting crop will almost certainly be diseased, 

 and in addition the fungus will pass into the soil, where it is 

 capable of living for several years. Scabbed potatoes can be used 

 for " seed " without the slightest danger of spreading the disease 

 if they are immersed for two hours in a solution consisting of 

 one pint of commercial formalin ( = formaldehyde, 40 per cent.) 



Scabbed Potato. 



mixed with thirty-six gallons of water. Afterwards the potatoes 

 are spread out to dry, when they may be cut and planted in the 

 usual manner. Great care must be taken after potatoes have 

 been treated as above that they are not placed in sacks or 

 hampers that have contained scabbed potatoes. 



Land that has produced scabbed potatoes is certain to be 

 infected with the fungus, and should not be planted with 



