1921.] Inspection of Potato Crops during 1920. 957 



Blackleg. — This disease has been noted in most districts, but 

 usually only in a small quantity. In most instances the plants 

 affected had probably died down before the land was visited. 

 No variety seems to be immune. 



" Rogues/' — " Rogues," i.e., potatoes of a variety foreign 

 to that planted, may be due to either self sets, e.g., plants 

 which have been produced from tubers left from previous crops, 

 or from tubers introduced with the seed. Owing probably 

 to mild winters, the self sets have been rather more prominent, 

 especially on land where potatoes come frequently in the 

 rotation. The following are the common " rogues " in the 

 chief varieties: — 



Variety. 

 Edzell Bhie ... 



Arraii Comrade 

 Ally 



Great Scot 



Kerr's Pink ... 

 Tinwald Perfection 

 Locliar 



Chiff Rogues. 

 Lord Tennyson, Rule Britannia, Forty Fold 

 (Immune). 



Generally very free. Ally " rogue " found. 

 Ar;-an Beauty (a British Queen), Up-to-Date, 

 President, and a pink-eyed round, probably, 

 Marquis of Bute. 

 Ai-ran Chief, British Queen, Abundance, Templar 



Lochar and Date, President. 

 King Edward: usually very free from ''rogues." 

 Up-to-Date. 



Usually very free. British Queen and Up-to- 

 Date found. 



British Queen and K. of K. most frequently 

 met ; also cases where King Edward has 

 appeared. King Edward and Great Scot, 

 Up to-Date. 



Usually very pure: occasionally a " Date " rogue 

 Occasionally an Edzell Blue. 

 Rogues very variable. British Queen, Ally, Date 



President, Eclipse, Lothair, and Great Scot. 

 Usually Up-to-Date. 

 British Queen, King George and Ally. 



The list of growers whose stocks of potatoes have been 

 certified as true to the variety stated and of the recognised 

 standard of purity is now ready. Copies may be obtained from 

 the Ofi&ces of the Ministry, 3, St. James's Square, London, 

 S.W.I, price 2s. post free. 



^Majestic 



Bishop 

 Templar 

 Avran Victory 

 King George ... 



Langworthy type 

 Abundance type 



