==The numerous enemies of Celery==, such as slugs, snails, the mole-cricket, and the maggot, do not seriously interfere with the crop where good cultivation prevails, but the Celery fly appears to be indifferent to good cultivation, and therefore must be dealt with directly.  Dusting the leaves occasionally with soot has been found to operate beneficially.  It should be done during the month of June on the mornings of days that promise to be sunny.  If the soot is put on carelessly it will do more harm than good; a very fine dusting will suffice to render the plant distasteful to the fly.  Syringing the leaves with water impregnated with tar has also saved plants from attack.  Where the eggs are lodged the leaves will soon appear blistered, and the maggot within must be crushed by pinching the blister between the thumb and finger.  Leaves that are much blistered should be removed and burned, but to rob the plants of many leaves will seriously reduce the vigour of growth.

==Celeriac==, or ==Turnip-rooted Celery==, is much prized on the Continent as a cooked vegetable, and as a salad.  In ordinary Celery the stem forms a mere basis to the leaves, but in Celeriac it is developed into a knob weighing from one to five pounds, and the root is more easily preserved than Celery.  When cooked in the same manner as Sea Kale, Celery is well known as a delicacy at English tables, and the cooked Celeriac ranks in importance with it, though it affords quite a different dish.  The stem or axis of the plant is used, and not the stalks.  To grow fine Celeriac a long season is requisite; and therefore it is advisable to sow the seed in a gentle heat early in March, and afterwards prick out and treat as Celery; but after the first stage the treatment is altogether different.  For the plantation a light and rich soil is required, and where the staple is heavy, a small bed can easily be prepared by spreading six inches depth of any sandy soil over the surface.  The plants must be put out on the level a foot and a half apart each way, and be planted as shallow as possible.  Before planting, trim carefully to remove lateral shoots that might divide the stems, and after planting water freely.  The cultivation will consist in keeping the crop clean, and frequently drawing the soil away from the plants, for the more they stand out of the ground the better, provided they are not distressed.  They must never stand still for want of water, or the roots will not attain to a proper size.  The lateral shoots and fibres must be removed to keep the roots intact, but not to such an extent as to arrest progress.  When a good growth has been made, and the season is declining, cover the bulbs or stems with a thin coat of fine soil, and in the first week of October lift a portion of the crop and store it in sand, all the leaves being first removed, except those in the centre, which must remain, or the roots may waste their energies in producing another set.  The portion of the crop left in the ground will need protection from frost, and this can be accomplished by earthing them over with soil taken from between the rows.