New York AGRICULTURAL EXPERIMENT STATION. 269 
Company, New York, and other manufacturers of arsenical — 
compounds. ‘ 3 
In a few cases where arsenical spraying had been delayed until 
too late for best results, kerosene oil was applied directly to the 
caterpillars that had assembled on the trunks and branches as 
shown at Plate XXXV, Fig. 2. This treatment was resorted 
to in several localities in the central and eastern part of the 
State with satisfactory results. But very little oil should be 
used as there is danger of injuring the bark and but little is 
needed to kill the caterpillars. ; | 
SHADE TREES. 
Owners of shade trees in villages and cities have successfully 
protected their trees by dislodging the caterpillars with streams 
of hydrant water and preventing their return by placing bands 
of cotton batting, sticky fly paper or other obstructions around 
the trunk. In some cases large shade trees were sprayed with 
arsenate of lead or Paris green by means of steam sprayers. 
Both are effectual if applied before the caterpillars are half- 
grown. Arsenate of lead is discussed more in detail under 
orchard treatment. 
MAPLHD GROVES AND FOREST TREES. 
The infested maple groves and large forest trees present the 
most difficult problems. Probably very little can be done. In 
some cases, however, large numbers of the caterpillars have been 
killed when assembled on the trunks and !ower branches by 
spraying or otherwise applying a small amount of kerosene oil. 
The cocoons are conspicuous and easily gathered, especially 
where the trees have been stripped of their leaves, as most of 
the caterpillars desert such trees and spin their cocoons near 
or upon the ground. ‘The offering of prizes to children for the 
greatest number of cocoons collected in a given time or the pay- 
ment of a small sum per thousand has been found in some 
instances a cheap and easy method of securing the destruction 
oi large numbers of cocoons. They should be gathered as soon 
