138 JOUKNAL OF THE KOYAL HOKTICULTUEAL SOCIETY. 
succeed in killing the fungus, as this treatment has lately been reported 
in the Gardeners' Chronicle (vol. xxvi. 1899, pp. 166, 167) as being 
successful in the case of the closely allied Rose Mildew. 
Concluding Remarks. — S. Humuli is already well known as the " Hop 
Mildew," a disease which in certain years causes immense loss to Hop 
growers. Besides growing on the Hop and Strawberry, the present fungus 
has been recorded on no less than eighty-one other species of host-plants, of 
Avhich about twenty are more or less common British wild plants. As there 
is every probability that the fungus spreads from these wild plants to the 
Strawberry, it is well to destroy, as far as possible, all mildewed weeds in 
the neighbourhood of the beds. One of the commonest weeds frequently 
attacked by S. Humuli is the Meadowsweet {Spircea Ulmaria), also the 
Wild Hop, and species of Willow-herb {Einlohium). 
If, as seems to be the case, the Strawberry Mildew is rapidly in 
creasing the severity of its attacks, and extending its area of destruction, 
it will become one of the most serious evils with which the Strawberry 
grower has to contend. It is characteristic of diseases of the present kind 
to appear in periodic waves, causing wholesale destruction of the crops 
attacked, and the invasion of the Kentish and other large Strawberry 
gardens by the present fungus in its worst form would undoubtedly cause 
similar ruin to that brought about by the first outbreaks of the Hop and 
Vine Mildews. In view of this danger, therefore, it behoves Strawberry 
growers at the first appearance of the disease to at once use fungicides, 
and to take every measure to prevent the disease from spreading. 
BiBLIOGEAPHY. 
1. Berkeley, M. J. : in the Gardeners' Chro7iicle for 1854, p. 236. 
2. CoENHiLL, J.: in GardeJi, xxvih. 1885, pp. 39, 40. 
3. Arthue, J. C. : Report of the Botanist to the New York Agric. 
Exper. Stat. (Extr. from 2nd edit, of Fifth Annual Report New York 
Agric. Exper. Stat, for 1886), 1887, pp. 275, 276. 
4. Humphrey, J. E. : Report 1892, pp. 31, 32, and 37 (Massachusetts 
Agric. Exper. Stat.). 
5. LoDEMAN, E. G. : The Spraying of Plants, 1896, p. 365, fig. 90. 
6. Journal of the Board of Agriculture for September 1898, vol. v. 
pp. 198-201. 
