AGRICULTURAL EXPERIMENT STATION. 181 



7. If cut seed is used, the surface should be allowed to dry, 

 for when placed iu the ground, the fungus if present, would find 

 ready entrance to the tubers through the freshly cut surface. This 

 is based upon the belief that the means of continuing the fungus 

 occur in the soil. 



8. If varieties less subject to the attack of the rot can be 

 found, select them for growing. 



9. Potatoes affected should be dug immediately and marketed, 

 as the disease rapidly spreads to the tubers in the ground, and is 

 almost sure to spread in the bin if they are stored. 



10. Thoroughly dry potatoes before storing them, for, if 

 damp, summer spores lodged upon them will germinate and 

 develope the disease in the pit or cellar. 



11. Store in a dry, cool place and keep dry, as warmth and 

 moisture favor the growth of fungi. 



12. Sort the potatoes in the cellar occasionally, and remove the 

 infected ones, as the disease will spread from tuber to tuber. 



If a dry place is not obtainable, then dust the potatoes with 

 dry air slaked lime at the rate of one bushel of lime to twenty-five 

 of potatoes. 



14. Plant on a sandy loam, or a well drained soil, as the 

 moisture of a heavy or poorly drained soil favor the disease. 



15. Plant in narrow patches running at right angles to the 

 prevailing summer winds. This is based on the fact that the 

 disease usually starts from a few infected plants and the disease 

 is spread by the wind. 



16. It has been recommended to soak the tubers for 24 hours 

 in a solution of copper sulphate, 6 ozs. dissolved in water enough 

 to cover a bushel. 



17. It has been shown that the fungus is destroyed by keeping 

 the tubers for a few hours at a temperature of 105° to 110° F. a 

 degree of heat that does not injure them for seed. This is a 

 promising method, as it would thoroughly disinfect the seed a 

 source of the disease. 



18. Deep covering of seed and deep covering in cultivation 

 have been recommended. It is believed that deep planting is 

 unfavorable to the fungus, and that the summer spores can not 

 reach deep covered tubers so readily. 



19. Do not go through an uninfected patch after walking 

 through an infected field, the spores will be carried on the clothing 

 and spread the infection. 



20. Do not plant early and late varieties contiguous. 



