32 Station Bulletin 372 



turbans, Edes stimulans, and E. vexans. A total of 17 species of Edes were 

 collected. The remaining genera were represented as follows: 



Anopheles, 3 species 



Culex, 4 species 



Culiseta, 2 species 



Uranotaenia, Mansonia, and Wyeomyia, 1 species each 



During the summer of 1946, the eye-spotted budmoth was found to be 

 on the increase in apple orchards in the Souhegan valley area. In the spring 

 of 1947, the insect was found to be quite prevalent throughout the southern 

 part of the state, and apparently is increasing. 



J. G. CoNKLiN, R. L. Blickle, W. J. Morse 



Apple Maggot 



Experimental work on this project had to be curtailed in 1946 because 

 of a crop failure in the experimental orchard. This was brought about by 

 severe frost, late in the spring. Observations on apple maggot activity and 

 insecticidal control were made as opportunity offered. 



Dust containing 5 per cent of DDT, applied in three applications, gave 

 good control of the apple maggot in two orchards which had a fair crop, 

 and where arsenate of lead had in previous years given unsatisfactory results. 



J. G. CoNKLiN 



Studies of Insects Affecting Spruces 



During the summer of 1946, an effort was made to detect spruce bud- 

 worm activity in some 30 permanent observation plots, which had been es- 

 tablished in the spruce-fir area of the state. The insect was not found in any 

 of the observation plots. However, a few specimens of the budworm were 

 found in outside areas in Pittsburg. In no case was defoliation evident. 



Because of the continued spread of the spruce budworm in Canada, 

 Maine, and New York, it is planned to carry on more intensive scouting to 

 detect the presence of the budworm in 1947. 



The European spruce sawfly was again found to be present in very small 

 numbers in spruce areas in 1946, but no actual defoliation was observed in 

 any of the areas examined. 



J. G. CoNKLIN 



Proposed Study of Spray and Dust Deposits 



Apparatus has been installed in a darkroom for the utilization of fluo- 

 rescence by means of photography. This includes suitable transformers and 

 a pair of high intensity ultra-violet lamps mounted on an adjustable rigid 

 stand. The impact of ultra-violet rays causes emission of light of longer 

 wave lengths. These are capable of photography. A camera, which is pro- 

 vided with extension tubes and a filter designed to prevent ultra-violet re- 

 flections from reaching sensitive film, is available. It is expected that both 

 panchromatic film and kodachrome will be used. 



As a preliminary groundwork the various chemical compounds now in 

 use as insecticides or fungicides will be examined for autofluorescence. Many 

 compounds under ultra-violet become luminescent. Fundamental informa- 



