100 Control of Parasites 
by threads. The white or yellowish cocoons are spun in 
the leaves on the tree or on the ground, in crevices of bark 
or other shelter. No tents like those of the apple tent- 
caterpillar are made, but thin carpets are spun along the 
bark, and occasionally several terminal leaves are included 
in the web. The moths are recognized by their rusty brown 
or buff color; they fly in July, and lay their eggs on the lower 
twigs, encircling them in belts, covered with a brownish 
protective covering. 
They feed not only on maple, but on a variety of species, 
and can become very destructive. 
Collecting the egg clusters, or cutting off the twigs with the 
egg clusters and burning them can be advantageously prac- 
tised with young trees in July or August. Crushing the 
clusters of young caterpillars, or else brushing, shaking, 
and jarring them down and preventing their re-ascent by a 
band of cotton batting, dendrolene, etc., or swabbing their 
nests in early morning with kerosene is effective in April 
to May, or else thorough spraying with kerosene emulsion 
or whale-oil soap or arsenite,’ as the leaves unfold. The 
collection of cocoons may also be resorted to, but care should 
be taken not to destroy them until the parasites have been 
hatched from them. 
Fall Web-worm. A familiar sight during July, August, 
and September are the conspicuous silken webs, nests of 
young, pale yellow, black-headed, black-dotted and striped, 
hairy caterpillars, which, feeding gregariously, spin one or 
several leaves together, enlarging the web as they grow 
until the foliage of the whole limb is included. In southern 
latitudes, two broods appear in a season, the first one issuing 
in June. The dark brown pupa is spun in a silken cocoon 
1 Boil one pound white arsenic with two pounds freshly slacked lime in 
one gallon of water for forty minutes and dilute in fifty gallons of water. 
