xxi 



MINISTRY OF AGRICULTUKE AND FISHERIES. 



ORMSKIRK POTATO TRIALS. 



ANNUAL REPORT FOR 1919 OF THE TRIALS 

 OF VARIETIES OF POTATOES IMMUNE 

 FROM WART DISEASE. 



SUMMARY OF CONTENTS. 



Sectiox I. Introduction 



A^^eathe^ ; Manures : Planting ; Condition of Seed 

 Section IL Miscellaneous Notes 



(a) Purity of Stocks... 



(/)) Incidence and Intensity of W^art Disease in 1919 



(c) Degrees of Susceptibility 



(d) The Question of Types ... 



(e) List of Cummercial Types and their Varieties ... 

 (/) Soil Fungicides ... 



((/) Steam Sterilization 

 (h) Report on Cooking Qualities 

 Section ill. Reports ox Ormskirk Trials, 1919 ... 



(a) Report on Small Stocks of Seedlings (Table I) 



(b) „ Immune Varieties previously tested (Table II) 



(c) „ „ Varieties tested in 1919 and showing no trace of V^art 



Disease (Table III) 



(d) „ Susceptible Varieties again tested in 1919 (Table IV) 



(e) Susceptible Varieties not previously tested (Table 

 (/) „ Varieties of Doubtful Immunity (Table VI) 



(g) Summary of Trials undertaken in 1919 



Section IV. Descriptivb List of Certain Immune Varieties 



Section V. Complete List of Named Varieties Tested at Ormskirk 

 FROM 1915-1919 



(rt) Immune Varieties 



(b) Susceptible Varieties 



((*) Varieties of Doubtfiil Immunity ... 



Section VI, Report on Local Immune Variety Trials in 19)9... 



Copies of this publication may be obtained from the Office of the 

 Ministry, 3, St. James's Square, London, S.AV.l. Price Is. 6d. net, 

 post free. 



