GYPSY AND BROWN-TAIL MOTHS AND THEIR CONTROL 



25 



colonies and applying intensive clean-up measures, and in every case 

 the colonies have been exterminated. 



Since 1921 several other small, scattered infestations have been 

 found on Long Island (fig. 12), and clean-up work here was undertaken 

 by the New York Department of 

 Conservation. Owing to its geo- 

 graphical location and the general 

 trend of spread of the insect away 

 from rather than to this island, 

 sufficient field work should furnish 

 ample protection from this pest. 



EXTERMINATION PROJECT IN 

 NEW JERSEY 



In July 1920 a State inspector 

 found the gypsy moth on a large 

 estate near Somerville, N. J. When 

 discovered, the infestation centered 

 in a large plantation of blue spruce 

 trees, several acres of which were 

 defoliated. There were dead trees 

 in the worst-infested portion of the 

 plantation, with indications that 

 they had been killed by complete 

 defoliation (fig. 13). 



The trees in this plantation had 

 been imported from the Nether- 

 lands about 10 years before, and 

 the infestation came with the shipment. This was prior to the e^ 

 actment of the Plant Quarantine Act, and emphasizes the pressing 

 need for precautionary measures to keep out dangerous pests. 



Figure 12.— Locations, outside of the large New- 

 Jersey and Pennsylvania infestations and the 

 barrier zone, where the gypsy moth has been 

 exterminated: 1, Cleveland (Bratenahl), Ohio; 

 2, Loretto, Pa.; 3, Geneva, N. Y.; 4, Schenec- 

 tady, N. Y.; 5, North Castle and Garrison, 

 N. Y.; 6, Brooklyn, Roslyn, Kew Gardens, 

 Patchogue, Shelter Island, and Greenport on 

 Long Island, N. Y.; 7, Deal Beach, "SVyckoff, 

 South Orange, Scotch Plains, Paterson, Madi- 

 son, Glen Rock, Elizabeth, and Rutherford 

 N. J.; 8, Henrysburg, Quebec. 



Figure 13.— Blue spruce defoliated and killed by the gypsy moth. 



