lOO NEW YORK STATE MUSEUM 



False cottony maple scale (Phenacoccus acericola 

 King). This insect has been abundant and injurious in the 

 vicinity of New York city in recent years. The city of Mount 

 Vernon appears to have been one of the chief sufferers, judging 

 from specimens and communications received from that local- 

 ity. This pest is easily distinguished from the older and better 

 known cottony maple scale ^ by the fact that it occurs in con- 

 spicuous felted masses upon the trunks of infested trees and- 

 also has large, cottony aggregations on the foliage, two situa- 

 tions where the cottony maple scale is never found with its 

 conspicuous white covering. The last named insect, though 

 its inconspicuous naked young occur upon the foliage, is rarely 

 observed except on the underside of the limbs after the females 

 have developed their characteristic, cottony masses protruding 

 from under a conspicuous brown scale. This species can be 

 controlled by thorough applications, in winter or early spring, 

 with a contact insecticide, using one pound of whale oil soap 

 to a gallon of water. The kerosene emulsion, the standard 

 formula diluted with four parts of water, has been found very 

 effective in controlling the cottony maple scale and would 

 doubtless prove equally efficient in the case of its associate. Sev- 

 eral oil preparations now on the market under various trade names 

 have also' been used successfully. 



Forest insects 

 Snow-white linden moth (Ennomos subsignarius 

 Hubn.). This destructive span worm first came to notice in 

 recent years during the summer of 1907 because of extensive 

 defoliations in the Catskills. The ravages of that season were 

 more extended the following summer and then included areas 

 in the Adirondacks as well as in the Catskills. The extended 

 outbreak of 1908 was also accompanied by noteworthy flights 

 of the snow-white millers in many cities and villages of the 

 Hudson valley. The past season has again witnessed exten- 

 sive injury in the Catskills, this pest causing a large amount 

 of damage to forests in the vicinity of Cooks Falls, Delaware 

 CO. and being particularly injurious in the township of Denning, 

 Ulster CO. Mr Alexander Tison, writing of conditions under 

 date of June 24, states that in 1908 the measuring worm de- 



^Pulvinaria vitis Linn. 



