The need for better mite control on poultry is becoming more apparent 

 with the rather general adoption of the system of housing birds continuously 

 in litter, without the use of roosts. Under such conditions high populations 

 of mites appear to be favored and there is a real need for improved miticides. 



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



Spruce Insects. 



Examination of permanent spruce budworm plots has indicated that 

 this insect is not on the increase in New Hampshire at the present time. 



The European spruce sawfly is present in very light numbers through- 

 out the spruce areas of the state. It shows no indication of building up from 

 year to year. 



J. G. Conklin 



Distribution of Blood-Sucking Diptera and Tricoptera. 



During the past year the distribution of Tabanids in New Hampshire 

 has been studied. Over 1500 specimens were collected and the known list 

 of species for the state has been increased to 70. 



Light trap records of mosquitoes are being continued, in cooperation 

 with U. S. Public Health Service. A list of species found to date is now in 

 process of publication. 



Studies of the Tricoptera of New Hampshire have been undertaken and 

 a list of species found to date is now in press. 



J. G. Conklin 



OTHER ACTIVE PROJECTS 



Control of the Apple Maggot and Certain Other Economic Insects. 



J. G. Conklin 



Farm Management 



(See Agricultural Economics) 



Fertilizers 



(See Agronomy) 



Floriculture 



(See Horticulture) 



Forestry 



Tree Thinning with Chemicals. 



A little over a year ago a new technique was examined to determine 

 whether it would be possible to inoculate unwanted cull trees with toxic 

 materials sufficient to kill them and to leave them standing in the woods. 

 Using ordinary blotting paper as a medium for absorbing sodium arsenite, 

 small tabs of ^2 inch x 2 inch were treated and dried. These tabs contained 



28 



