Control. DDT is effective. Make the first application just before blooming, and apply 2 to 4 more sprays at 10-day intervals, combining with
Fermate or bordeaux mixture to control black rot.
GYPSY MOTH (Porthetria dispar).
Way back in 1869 some moths brought
to this country for experiment in silk production got away. New
England has since spent millions of dollars paying for that accident, but
a strict quarantine and an expensive barrier zone maintained along the
Hudson River from New York to Canada has confined destruction to
New England. Almost all shade and forest trees, evergreen or deciduous,
can be stripped of foliage and often killed by brown caterpillars bearing
long tufts of brown hairs and having 5 pairs of blue tubercles followed
by 6 pairs of red down the back. Eggs are laid in oval clusters coated
with tan hairs on tree trunks, buildings, and even automobiles. The caterpillars hatch in late April and early May, pupate in light cocoons on tree
trunks, and the moths emerge in late July. The males are dark brown,
the females buff with dark markings and such heavy bodies they can
Control. Egg masses can be killed in winter by daubing them with
creosote. DDT applied by airplane, using a pound or less of the pure
chemical per acre, has been effective and economical and has not interfered with bird life.
ORIENTAL FRUIT MOTH (Grapholitha molesta).
An important peach enemy in eastern states, sometimes attacking other fruit. Pink or
creamy larvae with brown heads,1/2 inch long, bore in twigs, causing
new growth to die and turn black, and feed in fruit, often entering
through the stem so the skin shows no blemish. Larvae winter in cocoons
on the bark, and small gray moths lay eggs soon after peaches bloom.
There are 1 to 7 generations.
Control. Either DDT or parathion gives good control starting with
the petal fall spray. If peaches have been sprayed for late brood larvae,
do not eat the skins.
are the adult stage of large hornworm caterpillars, and
the tomato hornworm has already been treated under that heading.
The CATALPA SPHINX (Ceratomia catalpae) is confined to that host which
it defoliates in some areas. The hornworms are nearly black with dark-
green markings, 3 inches long, and the gray hawkmoth adults have a
wingspread of 3 inches. Eggs are deposited in masses on underside of
leaves. There are 2 generations a season.
Control. Spray or dust trees with lead arsenate or DDT.