90 ASSOCIATION OF ECONOMIC ENTOMOLOGISTS. 



destructive for the last two or three years in Dutchess County. The 

 grape root-worm (Fidia vitidda Walsh) is generally distributed in 

 the Chautauqua region and quite injurious to vineyards here and 

 there, especially to those on the lighter soils. The last season has 

 oeen marked by the insects becoming decidedly more abundant in 

 vineyards on the hills back from the lake that were previously com- 

 paratively free from the pest. The experiments in 1903 and 1901 

 were continued by general observations upon the vineyards in 1905. 

 The result has shown beyond all question the practicability of pre- 

 venting severe injury by means of timely cultivation for the destruc- 

 tion of pupa? and by the collection of the beetles. 



Grass lands in various sections of the State have suffered, in addi- 

 tion to army worm and webworm outbreak- mentioned above, from 

 injury by white grubs; and the abundance of spittle insects (pre- 

 sumably Pkttcenus lineatus L. and P. spumaria L.) was remarkable. 



Shade trees in a number of our principal cities have been very 

 severely injured by larva? of the white-marked tussock moth (JELeme- 

 rocampa leucostigma S. & A.). The fall webworm (HypTiemtria 

 textor Harr.) has been somewhat common, particularly in the fruit 

 sections of western New York. The elm leaf-beetle ( Galerua lla 

 luteola MiilL) continues to be a serious enemy in the Hudson Biver 

 Valley and is now -aid to be generally distributed throughout Glens 

 Falls. The European elm case-bearer (Coleophora limosipenella 

 Dup.) has become firmly established on Long Island. It has spread 

 from Brooklyn to Oyster Bay. in which latter place it is nearly as 

 destructive to elms as the elm leaf-beetle. The general appearance 

 of injured foliage is somewhat similar in spite of this species being 

 a miner. The work of this lepidopteron is at once recognized by the 

 circular feeding orifice and the more rectangular shape of the semi- 

 transparent areas. The maple Phenacoccus {Phenacoccus acericola 

 King), first noticed as abundant and injurious in this section in 1901. 

 continues to be somewhat destructive in the lower Hudson Valley. 

 The rare woolly maple leaf aphide {Pemphigus acerifolii Riley) is 

 unusually numerous on Long Island and in the Hudson Valley. 



The economic results of applying oil to swamp and woodland 

 pools was strikingly brought out this summer by the statement that 

 at Lawrence the green-headed horsefly {Tabanus lineola Fab.) was 

 decidedly more abundant than a few years ago when this community 

 applied petroleum to many pools for the purpose of destroying 

 mosquito larva?. Later ditching operation- have rendered the use of 

 oil largely superfluous, and a- a consequence horseflies are much more 

 abundant than they were when the oil method was in force, a strik- 

 ing confirmation on a somewhat extended >cale of Professor Por- 

 chinski's observations in Busr-ia. 



