130 DISEASES OF GLASSHOUSE PLANTS 
a soft, rapid growth, such as is produced by liberal 
dressings of nitrogenous fertilizers accompanied by high 
temperatures, renders the plant more susceptible to 
“stripe” than does a hard, slow growth accompanied 
by suitable additions of potash. Overhead damping 
TABLE 9. 
The Effect of * Damping” on the Incidence of the Disease. 
DAMPED. Not DAMPED. 
Variety. 
Total Plants. No. Striped. Total Plants. No. Striped. 
{Comet 260 124 260 110 
Fillbasket 260 112 260 95 
Kondine Red 260 112 260 82 
Ailsa Craig 260 95 260 34 
TABLE 10. 
The Effect of Forced and Slow Growth on the Incidence of 
the Disease. 
FORCED GROWTH. SLOW GROWTH. 
Variety. 
Total No. of No. of Diseased Total No. of No. of Diseased 
Plants. Piants. Plants. Plants. 
Fillbasket 100 44 
Comet 100 88 26 
Kondine Red 100 24 14 
Ailsa Craig 100 16 
also favours the disease. These observations are fully 
confirmed by inoculation tests carried out on plants 
grown in pots. Increased applications of nitrogen were 
found to favour the disease, and suitable dressings of 
potash to reduce it. 
As stated above, the most usual mode of infection 
would appear to take place underground, young attacked 
plants showing on examination a brown discoloration 
of the root cortex. The occurrence of disease in 
