DEPARTMENT OF AGRICULTURE 45

cipal feeding area of the worm is on the plant. Adult moths
lay eggs on the underside of the topmost leaves. They hatch
and begin feeding immediately. Because of the density of the
leaves several leaves can be damaged very quickly by their
ravenous feeding. These worms have a special fondness for
flower buds and seed pods, and careful observation and dili-
gence are required to hold this pest in check.
 Present recommendations are; 5 to 10 per cent DDT or
TDE. Dust at the rate of 20 to 25 pounds per acre. It is
important that the dust be placed in the bud for best results.
Corn meal with lead arsenate was once recommended because
it is thought that the worm would be attracted to the bait
rather than the leaf, thus reducing leaf damage. This prac-
tice is seldom used today. Some growers have had fair to
good success with the use of power sprays in controlling bud-
worms particularly when the spray nozzle is fitted immediately
above the plant heads.
 Hornworms: (Southern or tobacco hornworms) These insects
may appear in early April. However, they usually appear in
greatest abundance during May, June and July. (See figure 25)
These larvae may grow to a length of 31/2 inches, and when
permitted to attain this size are difficult to control. Larvae
of this size may consume practically a whole leaf within
24 hours. It is best to control the hornworm while the larvae
is small.
 The appearance of small pin head-holes on the leaves tells
one it is time to use control measures. Several materials are
recommended. Namely, TDE, endrin, DDT or parathion. Several
of these materials are compatible when mixed together as
either a spray or dust. The use of combination dust or spray
may be advantageous provided the insect populations are large
enough to warrant their use. TDE plus parathion is recom-
mended quite extensively for the control of hornworms, bud-
worms, aphids and flcabettles. Consideration of the need plus
cost is a matter for the grower to determine.
 Recommendations: 5-10% TDE, or 1 to 11/2% endrin dust
used at the rate of 15 to 30 pounds per acre.
 For Spray: 50% TDE, (DDD) or 50% DDT wettable pow-
der, 2-3 pounds in enough water to cover an acre, or 25%
TDE (DDD) or 25% emulsifiable concentrate at the rate of