20 
CELERY. 
before, and I therefore am under the impression that gardeners 
who have any difficulty in growing Carrots should adopt the above 
method.” 
The following observation sent by Mr. Whitton, from The Gardens, 
Coltness, Lanarkshire, is a good illustration of the benefit of rotation 
of crops :—“ This year, for experiment, I sowed Onions, Carrots, &c., 
in a small reserve garden we have, in which Cabbages and Peas only 
have grown for years. These were treated in the usual way with the 
others in the main garden (which is the dampest), and not a root was 
touched.” 
When once the ground gets infested by any of the various insect- 
pests it is no easy matter to get rid of them, so long as the plants on 
which they feed are cultivated. 
CELERY. 
Celery and Parsnip Fly. Tephritis Onopordinis, Curtis. 
Tephritis Onopordinis, Curtis. 
Celery Fly, magnified ; line showing nat. size ; maggot and pupa figured in 
blistered leaf. 
One of the marked features of the crop attacks of 1883 was the 
great prevalence of injury from different kinds of Fly maggots. The 
method of attack of the Celery and Parsnip Leaf-miner is almost 
exactly like that of the Mangold leaf-grub, excepting that Mangold 
i 
