56 THE FORCING GARDEN. 
the spurs are strong, when the leaders may be allowed 
to advance until the tree is fully developed. 
The Cherry above all other fruits is liable to be in- 
fested with the black aphides both indoors and out. 
This pest will so infest the points of the young shoots 
as completely to stop all further growth, but they will 
not attack the older foliage. Now the constant nipping 
out of the points of the young growth will be one 
means of preventing these attacks. The remedies are, 
to fumigate them when in the house, and when on the 
open wall to syringe the trees with some insecticide. 
In my opinion a house planted with the May 
Duke, Bigarreau Napoleon, or the old Bigarreau, each 
of which bears well, would fetch from 9d. to 1s. per 
pound freely, for Cherry trees bear abundantly when 
well managed, and many pounds may be had from one 
of these treble cordons when it is fully developed. It 
is seldom, however, that the best dessert Cherry trees 
can be made to bear on open walls, but under a well- 
constructed house an abundance of fruit may be had. 
Now suppose a house of the same dimensions as 
the Plum-house with a back wall of the same height, 
planted with twenty cordon Bigarreau or the May 
Duke, and trained on this plan, they would cover the 
wall in the course of four years and be full of fruit- 
spurs three-fourths of the way up; and on each of 
these treble cordons there would be in all probability 
ten pounds of fruit, which at one shilling per pound, 
ten shillings per tree, 10/., and say 15/. for fruit from 
the whole of the pot-trees, that would be 25/. from 
such a house, which would be a remunerative thing 
considering the little trouble and expense, there being 
no firing nor pots required after the first outlay. An 
