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with 5 parts of the same materials as mentioned for derris dust. It should be 
emphasized that arsenicals are not recommended for cabbage worm control on these 
crops, owing to the poisonous residues likely to remain on the edible portion, 
and because less satisfactory results were obtained with arsenicals. 
CUTWORMS AND CORN EARWORMS ON CABBAGE 
In certain sections of the country, especially during the fall season, 
several species of cutworms and the corn earworm are sometimes more abundant 
and cause more- damage to the foliage of cabbage than do the usually more prev- 
alent species of "green" cabbage worms. Neither derris nor pyrethrum, at the 
dilutions tested, has been effective in combating cutworms or the corn earworm 
on cabbage. When such cutworm infestations are expected, a standard cutworm 
poisoned bait should be used before the crop is set in the field, or, in cases 
where seed is planted, the treatments should be made before the plants appear 
above the ground. The early treatments can be followed by later treatments, 
care being exercised to prevent the bait from lodging on any portion of the 
plants that are to be marketed. When the corn earworm is present in destructive 
abundance on cabbage, dust applications of paris green, calcium arsenate, or 
cryolite should be made, at the strengths recommended in this circular, before 
the plants begin to head. 
CABBAGE WEBWORMS ON CABBAGE 
Results of experiments during 1936 indicate that the cabbage webworm can 
be controlled by applications of dust containing 0.5 percent of rotenone, pro- 
vided applications are made during the early stages in the growth of the in- 
sects and of the plants. In these treatments, the cabbage plants should be 
covered thoroughly with the dust. 
CELERY INSECTS 
Celery leaf tier 
The celery leaf tier is the major pest of celery in the Florida producing 
area, and also periodically becomes troublesome in the North and in California. 
This pest can be controlled by careful treatments with pyrethrum dust, the dust 
being mixed with an equal quantity by volume of tobacco dust. The treatment 
consists of making two applications within a period of one-half hour. The ob- 
ject of making the second treatment within such a period is to kill those worms 
which have moved from the web as a result of the first treatment. Approximately 
25 pounds of che mixture per acre are necessary for each application. Except 
under unusual conditions in the Florida area, one treatment, that is, two appli- 
cations at a half-hour interval, is sufficient to protect any one given area of 
celery. 
Arsenicals are not satisfactory as a control for this pest. 
Celery looper 
Several species of loopers attack celery. In Florida these pests are 
usually held in check by a bacterial disease, and observations so far would 
indicate that ordinarily no artificial control measures are necessary. These 
