ater on which a thin scum of kerosene is
floating.

=Blister beetles= may be controlled, under ordinary circumstances, by
the same method employed against the Colorado beetle. When they are
present in great numbers a good remedy consists in driving them with the
wind from the cultivated fields into windrows of straw or similar dry
material previously prepared along the leeward side of the field, where
they will congregate and can be burned.

[Illustration: FIG. 38--TOMATO WORM (_Protoparce sexta_) (_a_) Adult
moth; (_b_) full-grown larva; (_c_) pupa--all reduced. (After Howard, U.
S. Dept. Agr.)]

=The tomato worms=, of which there are two common species closely
resembling each other, are often abundant and destructive on tomato
foliage, particularly southward. The arsenicals will kill them, or they
can be held in check by hand-picking, a little experience enabling one
to detect their presence readily. Turkeys are utilized in destroying
these worms in the South.

[Illustration: FIG. 39--TOMATO STALK-BORER (_Papaipema nitela_)
(_a_) Female moth; (_b_) half-grown larva; (_c_) mature larva in injured
stalk; (_d_) lateral view of abdominal segment; (_e_) pupa--all somewhat
enlarged. (From Chittenden, U. S. Dept. Agr.)]

=The stalk-borer=, as its name implies, attacks the stalk, and is an
intermittent pest, though quite annoying at times. It is difficult to
combat, but its injuries may be prevented by care in keeping down, and
by _promptly_ destroying, the weeds after they are pulled or hoed out
during the growing season. If weeds are left to dry the striped
caterpillar of this species will desert them and enter cultivated
plants. Ragweed and burdock are the principal foods of this insect, and
special attention should be given to eradicate them where tomatoes are
planted. Crop rotation is advisable where this can be conveniently
practiced, and such plants as cabbage, radish and the like, onions,
beets, asparagus and celery are suggested as alternates. When the plants
are sprayed with arsenicals for other insects this will operate to a
certain extent against the stalk-borer.

[Illustration: FIG. 40--CHARACTERISTIC WORK OF THE TOMATO FRUIT WORM
(_Heliothis obsoleta_) (Redrawn by Johnson from C. V. Riley)]

[Illustration: FIG. 41--ADULT MOTH, OR PARENT OF TOMATO FRUIT WORM
(From Chittenden, U. S. Department of Agriculture)]

=The tomato fruit worm= (Fig. 40) known as the bollworm of cotton and the
ear worm of corn, is