1. An attempt to maintain the health of a stock of Scotch seed Majestic in England is described.
A small stock of seed obtained direct from Scotland was split up into three equal portions A, B, C, which were grown isolated from each other and all other potatoes for three years (1927–9).
A. Remained unrogued.
B. Had all plants showing virus disease symptoms rogued out and the requisite seed saved from the remaining plants when mature.
C. Had a similar quantity of seed saved from ostensibly healthy plants when immature.
2. In a final chequer board yield trial fresh Scotch “stock” seed, which can be assumed to be above the average of ordinary Scottish seed, beat stocks A, B and C significantly. There was no significant difference in the yields from the stocks obtained by the two methods B and C and both stocks beat the mature unrogued stock A significantly.