314 Eeport of the Assistant Horticultubist of thb 
Scabby vs. Smooth Seed Tubers. 
It is quite important to know whether the product will be less 
affected by scab when tubers free from scab are planted than when 
scabby tubers are used. 
Duplicate plantings, as given in the following table, were made in 
eight-inch pots, filled with potting soil and placed in the green-house 
February 19. All were treated as nearly alike as possible. 
TABLE — Seed. 
seed. 
Tubers free from scab 
Duplicate 
Tuber free from scab planted with scabby tuber 
Duplicate 
Tuber free from scab watered with water in 
which scabby tubers were soaked 
Duplicate 
•2© 
IS 
O 
f-i 
100 
100 
100 

100 
75 
In this experiment nothing appears to have been gained by using 
tubers free from scab. In the products of both of the tubers free from 
scab, every tuber was more or less scabby. In the two plantings of a 
smooth and scabby tuber in the same pot, the product of one was four 
tubers, all scabby, and of the other one tuber free from scab. The 
plantings of smooth tubers watered with the liquid in which scabby 
tubers had been soaked for 48 hours, in each case produced some 
scabby tubers and one tuber free from scab. 
Comparing the yield of smooth and scabby tubers, as given in the 
table A, page 309, we obtain the following data: 
Scabby Seed. 
Whole No. Per cent 
of tubers, scabby. 
Irrigated 823 57 
TJnirrigated 961 32 
Smooth Seed. 
Whole No. Per cent 
of tubers, scabby. 
Irrigated 835 44 
Unirrigated 907 29 
