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THE FARMERS HANDBOOK. 



These seed tubers should then be planted in a seed plot, situated some 

 little distance from the main or other potato crops, and in the following 

 season all plants in this plot which show Leaf Roll should be noted and 

 removed promptly, as soon as they are recognised. The remaining tubers 

 will provide the seed for the main crop in the following year, with the 

 exception of the small number necessary again to maintain the seed plot. 



(a\ Initial Stage of Leaf Roll (variety —Surprise). 

 ('-) and (<■). Advanced Stages (variety —Satisfaction). 



If this system of two-year selection of the seed potatoes was practised, 

 or a known disease-free strain were propagated in a seed plot, and rogued 

 only one year, it is certain that much higher yields would be obtained. 

 The method would not be costly, but would involve attention to that most 

 vital of all potato-growing problems — the selection of the best seed. The 

 present haphazard methods of securing seed from the crop without any 

 knowledge as to whether the tubers come from Leaf Roll plants or not will 

 only result in further depression of the yields. 



