58 NEW YORK STATE MUSEUM 



soap, used at the rate of i pound to 6 or 7 gallons of water, or the 

 standard kerosene emulsion, diluted with nine parts of water, should 

 be effective if thoroughly applied. A wash composed of 3 gallons 

 of water, -| pound of hellebore and one teaspoonful of carbolic acid, 

 applied to the mfested portions of the tree with a whitewash brush 

 in early spring, has been found very effectual in Illinois. It would 

 not be surprising if a thorough application of a lime-sulfur wash 

 in early spring would be equally valuable in checking this pest. 



Juniper scale (Diaspis carueli Targ. Tozz.) . This 

 scale has been brought to notice several times on account of its 

 occurring upon juniper in various localities in New York State. Mr 

 John Dunbar, assistant superintendent of the park, Rochester, 

 N. Y., writing under date of April 16, 1906, transmitted specimens 

 of this scale and stated that it was becoming a menace to the juniper, 

 Juniperus virginiana glauca, and also occurred on 

 Pinus aristata, the latter being a new food plant for this 

 species. Subsequent observations by Mr. Dunbar showed that this 

 insect began breeding in Rochester early in June, and that thorough 

 spraying at this time with a ^i solution of scalecide was 

 very effectual in checking the pest. This scale insect was noticed in 

 1880 by Professor Comstock, who recorded it at that time as very 

 common in Washington where it occurred on the following species 

 of juniper and arbor-vitae : Juniperus chin en sis, J. 

 rigida, J. oxycedrus, J. japonica, J. com- 

 munis, J. reresii, Biola orientalis and 

 Thuya occidental! s. Messrs Riley and Howard re- 

 corded this species in 1895 from Jamaica Plain, Mass., where it 

 occurred on Juniperus sphaerica, brought over from 

 Germany some four or five years before. 



Elm bark louse (Gossyparia spuria Mod.) . This 

 species has been quite destructive to elms, particularly the Scotch 

 elm, in recent years. It is rather abundant and appears to be gener- 

 ally distributed throughout the city of Troy, N. Y. The females 

 had attained their maximum development early in July and the 

 woolly matter excreted from the lateral pores made the insects 

 rather conspicuous. This bark louse while preferring European 

 elms is also somewhat abundant on American elms, though hardly 

 so injurious to the latter. 



Forest insects 



White pine weevil (Pissodes strobi Peck). The 

 blighting work of this weevil on pine is well known, though full 



