12 
NONFAVORABLE 
Alder Alnus incana (L.) Moench. 
Apple Pyrus mains L. 
Gray birch Betula populifolia Marsh. 
Elm Ulmus americana L. 
Red oak Quercus borealis maxima (Marsh.) 
Ashe (Q. rubra auct.). g 
White oak Quercus alba L. 
Scarlet oak Quercus coccinea Moench. 
Pear Pyrus communis L. 
Red maple Acer rubrum L. 
Paper birch Betula papyrifera Marsh. 
White ash Fraxinus americana L. 
Hickory Hicoria ovata (Mill.) Britton. 
From the time of hatching to the adult stage the larvae of the satin 
moth feed on the food plants listed as favorable, but have seldom 
been observed under field conditions to attack the species listed as 
partially favorable. Glendenning 6 reports that the insect was noted 
sparingly on the native cottonwood, Populus trichocarpa Torr. & 
Gray, at New Westminster, British Columbia, and A. G. "Webb has 
found the larvae feeding on this and on willow trees in the State of 
Washington. 
Larvae of the satin moth have not been reared from hatching to 
maturity on the trees listed as partially favorable, but fed through 
the first two fall stages and hibernated successfully with no other 
food than scrub oak. • Emerging in the following spring as third- 
stage larvae, they began feeding on scrub-oak leaves in the laboratory, 
but died without molting. Larvae which fed on poplar during the 
first two stages in the fall were successfully reared to maturity on 
scrub oak the following spring. The feeding experiments have in- 
dicated that black oak is less favorable than scrub oak. Larvae which 
have had only black-oak foliage for food have been reared through 
the first two stages and lived through the winter ; but in the spring, 
when black oak was the only food supplied, they died without fur- 
ther development. Larvae which were fed on poplar only during the 
first two stages, and hibernated successfully, were fed on black oak 
during the following spring; they developed slowly, and in no case 
reached maturity. 
The foliage of the trees listed as nonfavorable has been tested for 
several years as food for larvae of the satin moth. In no case have 
caterpillars developed to the hibernating stage when restricted for 
food to any of the trees listed in this group. 
ARTIFICIAL CONTROL 
In cases where the satin moth is abundant and many egg clusters 
are deposited the latter can be destroyed by treating them with 
creosote. This treatment should be applied as soon as possible after 
the eggs are laid, as hatching takes place in from 10 to 20 days 
after the time of deposit, and after the eggs have hatched the treat- 
ment is futile. Crude coal-tar creosote, to which a small quantity 
of lampblack is added, so as to leave a black residue on the treated 
clusters, will be satisfactory. It should be applied with a brush; 
if this is attached to a pole many of the clusters on the trunks 
6 See p. 4 of publication cited in footnote 3. 
