100 NEW YORK STATE MUSEUM 



the ground if one has good eyesight, though a powerful field glass 

 is of material service. As noted elsewhere, egg masses of the apple 

 tent caterpillar are unusually abundant in one section and it would 

 not be surprising if investigations showed the same was true of 

 the forest tent caterpillar. Apple trees in the vicinity of forests 

 are particularly likely to be injured in case there is an outbreak. 

 An early spraying with arsenate of lead, using at least 2 pounds 

 to 50 gallons of water, would be advisable under such conditions 

 for the purpose of destroying the hosts of young caterpillars before 

 material injury results. 



Locust leaf miner (Chalepus dorsalis Thunb.). Seri- 

 ous injury by this species was observed at Syosset and in that 

 vicinity in August and September 191 1, the beetles confining their 

 operations largely to trees less than 30 feet high. An allied form, 

 the rosy Hispa, C. nervosa Panz., was associated with and, 

 in certain localities at least, more abundant than the parent of the 

 locust leaf miner. The depredations of last season were continued 

 this year, though in early July there was practically no injury by 

 the beetles. Full-grown larvae of the locust leaf miner were then 

 common in locust leaves and a few adults were observed. There 

 were no signs of the allied C. nervosa. Early in August a 

 totally different condition of affairs prevailed. The leaves of many 

 of the larger trees, especially the apical ones, were brown, a con- 

 dition due almost entirely to ithe feeding of the beetles. The latter 

 were extremely abundant, two, four, six and even eight occurring 

 on individual leaflets, the larger number being in the more sheltered 

 situations. The small trees were more seriously affected than the 

 larger ones, and from reports received subsequently it was evident 

 that serious injury was inflicted. The extensive feeding at this 

 season is evidently followed by the beetles going into hibernation, 

 since there seems to be but one generation annually in this section. 

 A more detailed account of this insect is given in our preceding 

 report, New York State Museum Bulletin 155, pages 59-63. 

 Serious injury by this insect was also recorded at Locust Valley 

 by the Rev. William M. Cook. 



It is evident from observation of local conditions that thorough 

 spraying with an arsenate of lead the latter part of July or early 

 in August, at the time the beetles begin feeding upon the foliage, 

 would result in protecting the trees from serious injury. This 

 treatment can be advised only for the more highly prized trees on 

 lawns or possibly along roadsides. 



