Florida Agricultural Experiment Station


page 11 would be found effective. Arsenicals could be used on
very young celery but the leaf-tyer does not ordinari'y trouble
young celery. Arsenicals cannot be used on celery within sev-
eral weeks of the time of marketing on account of the residue,
which, lodging in the bases of the leaf stalks, remains for a long
time.
 SEMI-TROPICAL ARMY WORM
 This insect, which feeds chiefly on grasses, sometimes at-
tacks celery in injurious numbers. It is a large caterpillar with
reddish brown markings. It is closely related to the sweet
potato caterpillar. The same poison baits which are recom-
mended for that insect will also control this caterpillar.
 GARDEN FLEA-HOPPER (Halticus citri)
 This is a minute black plant-bug (Fig. 26) that attacks the
leaves of cowpeas, beggarweed, peppers, and a great variety of
weeds. The attacked spots turn yellow, giving the plant a










Fig. 26.-Garden flea-hopper; a, Short-winged female; b, full-winged female; c, male; d,
 head of male in outline. Eight times natural size. (From U. S. Bur. of Ent.)

 spotted, peppered" appearance. The insect may be con-
 trolled by nicotine compounds, but the pyrethrum extracts will
 be found more satisfactory.
 TARNISHED PLANT-BUG (Lygus pratensis)
 This bug (Fig. 28) is very common the country over in
 gardens where it frequents blossom heads and other very young
 and tender herbage and even the tender shoots of trees. The
 succulent stalks of the celery plant afford a very acceptable
 feeding place. In addition to stunting the growth of the plant,
 due to the insect sucking the sap, brown spots are produced
 where the punctures are made. These greatly reduce the at-
 tractiveness of the produce on the market.