REPORT OF ASSISTANT DAIRY INSTRUCTOR. 29 



nearly 75 per cent of the tubers affected. This is causing much 

 loss to the buyer, with potatoes practically three cents per 

 pound wholesale, as the waste is great. 



Potatoes containing net-necrosis are not fit for seed, as the 

 resulting crop will most surely contain a much larger per cent 

 of the tubers affected than the seed planted contained. Neither 

 is it advisable to plant a field the second year if the previous 

 crop showed the disease, as it seems certain that it will live 

 over at least one season in the soil. When clean seed is used I 

 have seen no traces of it with a four-years rotation. A special 

 effort on the part of the Department of Agriculture should be 

 made to induce those who have had this disease the past season 

 to plant seed free from it. 



In conclusion, I will say that I believe this work to be more 

 firmly established than at any period since its inception ; and 

 there will be the coming season a greater demand from those 

 growing potatoes to have their fields inspected and certified 

 than ever before. 



Respectfully submitted, 



E. A. ROGERS, 

 Assistant Dairy Instructor. 



