New Youk Agricultural Experimeint Station. 269 



Coinpany, New York, and oitber mauufacturens of arsenical 

 compounds. 



In a few cases wliere arsenical spraying had been delayed until 

 too late for best results, kerosene oil was ap'plied directly to tlie 

 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 eas/tern 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 steams sprayers. 

 Both are effectual if applied before the caterpillars are half- 

 growu. Arsenate of lead is discussed more iu detail under 

 orchard treatment. 



MAPLE 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 Ijwer 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 cucuuus. They should be gathered as soon 



