The great Celery enemy is the small fly called Tephritis onopordinis, which deposits eggs between the skins of the leaf. The greyish zigzags which are seen on the leaves of Celery in summer and autumn are caused by the burrowings of the maggots which hatch from the eggs in question. The Tephritis seems to be an eccentric sort of creature, attacking the Celery by fits and starts. Sometimes it fires a shot or two early in summer, resumes the attack spasmodically a few weeks later, and then either retires altogether or braces its energies for a vigorous onslaught in autumn. In any case, it need do no serious damage, for the watchful cultivator may nip its operations in the bud by pinching the first patches seen between his finger and thumb. If it should escape his vigilance, and threaten to become seriously troublesome, or should he object to the tedium of pinching, let him spray the plants towards evening with "soaparite" (1 lb. of best soft soap boiled in 1 quart of water for an hour, then 1/2 pint of paraffin stirred in, and the solution well churned with a syringe in 8 gallons of water). This is a much more certain preventive than dusting with soot, and if the solution is properly prepared the Celery is never tainted.