14 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
coasts, which are carted up and laid on the soil and borders, 
considerably improving the soil by its decomposition, mecha- 
nically as well as manurially. 
The success of the Guernsey Tomato-grower cannot, there- 
fore, be placed to the credit of his natural advantages. In one 
thing only can he be said to have an advantage over an 
English grower, and that is his climate. The winter in 
Guernsey is mild as a rule ; it has an average for the winter 
months of 43°-5 F., and an excessively small daily range of 
temperature — only about 10° F. — which is exceeded even in Jersey, 
and, of course, the range of temperature is very much greater in 
England. Here lies the chief advantage of Guernsey ; the cold 
snaps, however bad they may be, are less bad here than else- 
where, and crops recover more rapidly than in England. But 
these advantages are not without their accompanying draw- 
backs, one of which — indeed the most serious — is the extreme 
suitability of the climate^to the growth of the lower forms of life, 
which, attacking the chief crops as parasites, cause an enormous 
loss to the growers. I have known men with only moderate 
areas under cultivation suffer losses amounting in a single 
season to more than £300 ; indeed, it may be said that an 
average house containing Tomatos will, if attacked by disease, 
suffer a loss of from £100 to £200 in a season ; and, unfortu- 
nately, in cultivating a crop like the Tomato the grower, under 
present conditions, is not only cultivating the crop but the 
disease. 
There are two enemies at present devastating Tomatos— one 
a fungoid disease, the other an insect pest — and to these two I 
shall devote the most of my remarks. 
Besides these two there are, of course, all the ordinary 
moulds and rusts which arc more or less destructive, but which 
may also be more or less successfully combated. Among those 
of lesser importance I may just name two of the chief, 
" Common yellow blight " {Cladosimium fulvum). This disease 
is to be found in almost every glass house, but if the gardener is 
alive to its importance he can generally keep it within safe 
bounds, and, as a rule, in Guernsey it does not very much hiter- 
fero with the success of a crop. The chief treatment given is 
rapid cliangos of the heat and humidity of tlio house, giving tlio 
house attacked an occasional thorough drying-off. Where this 
