48 ASSOCIATION OF ECONOMIC ENTOMOLOGISTS. 



killing the scale was concerned, but no injury to the trees was re- 

 ported. It was considered ad\dsable to use a stronger solution than 

 the one recommended by the manufacturers. 



Mr. Slingerland called attention to the fumigation of greenhouses 

 for controlling the violet fly (Contarinia violicola Coq.). Some 

 large violet growers had suffered severe loss from this insect. It 

 had been found that less than one-half strength of cyanid, as often 

 recommended, may destroy the foliage of violets. It therefore 

 seemed quite necessary for some further tests to be made along this 

 line. 



Mr. Sherman gave some general notes from North Carolina, and 

 stated that where Scalecide had been used at the rate of 1 gallon to 15 

 gallons of water in the fall, and lime and sulphur had been applied 

 in the spring, good results had been secured. The fall army worm 

 {Lapliygma frugiperda S. & A.) did considerable damage during 

 the past season. Eose bugs (Macrodactylus subspinosus Fab.), al- 

 though usually not an important pest, defoliated liquidambar trees 

 over large areas. 



Mr. Brooks stated that the larvae of rose bugs are eaten by the 

 short- tail shrew. He had observed this in West Virginia during the 

 past season. 



The meeting then adjourned until 10 a. m. Saturday. 



MORNING SESSION. SATURDAY, DECEMBER 29, 1006. 



The meeting was called to order by President Kirkland at 10 a. m., 

 and the following paper was presented : 



SOME OBSERVATIONS ON THE NATURAL CHECKS OF THE COT- 

 TONY MAPLE SCALE. 



(Pulvinaria innumerabilis Rathv. ) 



By Edgar L. Dickerson, New BrunsioicJc, N. J. 



In the various accounts of the cottony . maple scale (Pulvinaria 

 innwmerabilis Rathv.) several parasitic and predaceous enemies have 

 been recorded as infesting this insect and aiding, to some extent at 

 least, in keeping it in check. A notable incident is that mentioned 

 by Dr. L. O. Howard in his account of this species, in which he states 

 that, because of the parasite Coccophagus lecanii Fitch, " it was found 

 almost impossible to carry the scale insect through the season at 

 Washington in 1898." The forms acting as the most effective checks 

 to the scale may differ in the various localities, and apparently even 

 in the same locality at different periods. For example, it was stated 

 that in Washington in 1879 the most effective enemy of this insect 



