1921.] The Distribution of Wart Disease. 951 



Clean Tubers War ted Tubers 



per Acre. per Acre. 



Variety. Tons. Cwt. Tons. Ciot. 



Cumberland Ideal ... 1 11 3 18 



1 7 3 15 



1 13 3 11 



Proportion 1 clean 2-5 warted. 



President type — 



President 5 10 3 6 



Scottish Farmer ...5 11 3 1 



Iron Duke 4 12 3 11 



Proportion 1 clean '66 warted. 



Up to-Date type — 



Prosperity (No. 1) ... 8 3 5 10 



Eentpayer 7 6 4 18 



Proportion 1 clean '7 warted. 



Arran Chief type — 



Arran Chief 2 5 5 12 



Prosperity (No. 2) ... 3 9 5 4 



Proportion 1 clean 2'7 warted. 



Recording of Characteristics of Potatoes. — Every variety 

 sent in to be tested was carefully studied throughout the 

 season, and the following facts were noted: — the colour of the 

 haulm, the presence or absence of bronzing and of wings on 

 the haulm, the type of wing, the colour of the leaves and 

 flower, the colour and shape of the anthers, the presence or 

 absence of pollen, the approximate proportion of fertile to 

 sterile pollen grains, the shape of the tubers, the shape, depth, 

 position and number of eyes, the colour and texture of flesh, 

 the colour of sprout at time of planting, keeping and cooking 

 qualities, resistance to blight, and degree of susceptibility to 

 Wart Disease. A few illustrations will show the practical 

 value of this work. Let us take the two varieties Arran Chief 

 and Great Scot, which appear to cause considerable confusion, 

 and about which it is important that growers and merchcints 

 should be very clear, as Arran Chief is very susceptible to Wart 

 Disease. 



(1) Arran Chief has an upright habit, the upper leaves are 

 erect and slightly mottled, the foliage is mediam green; the 

 haulm is bronzed and the wings are goffered; the flower is 

 white, and the calyx has a band of yellowish green round it. 

 The tubers are somewhat difficult to distinguish from Great 

 Scot, but at time of planting the sprouts are dark purple. 



