Maine 
Mass. 
Mass. 
Mass. 
Mass. 
as 
Wood Borers in Forest Products. To (1) determine species 
of borers in damaging cut logs and other forest products, and 
relative importance of species found; (2) work out life cycles 
and‘ habits, for Maine, of species found to be most destructive; 
and (3) use acquired knowledge of life cycles as basis for 
research tests to develop effective controls for wood borers 
in Maine. 
For. 79 
Insects Concerned in the Dispersal of Dutch Elm Disease 
With Special Reference to the Native (American) Elm Bark Beetle, 
Hylurgopinus Rufipes (Eich.) To (1) study habits and distribution 
of Hylurgopinus rufipes (Eich.), Scolytus multistriatus Marsham and 
other insects which may be vectors of Dutch elm disease fungus, 
Ceratostomella ulmi (Schwarz) Buisman, especially correlation 
between timing of their feeding habits and seasonal development of 
host trees when fungus invasion is most likely, so insecticides may 
be applied at most appropriate time; (2) test new insecticides for 
elm bark beetle control; (3) experiment with hydraulic sprayer$ and 
mist blowers and, when possible, helicopters and other new spraying 
equipment to learn effectiveness in covering tall trees with insecti- 
cides; (4) study effectiveness of most promising insecticides and 
spraying equipment in actually preventing elm trees from becoming 
infected with Dutch elm disease fwmgus over a period of 5 to 10 
years; and (5) when necessary, and in cooperation with other depart- 
ments, study toxicity to cattle of any insecticide that seems immi- 
nent of adoption by the public for Dutch elm disease control. 
Ent. 53 
Materials and Methods Which Promise Value in Control of Insects 
and Mites on Ornamental Shrubs and Shade and Forest Trees. Study 
value of newer insecticides and miticides, and applications for 
control of raat and mites on ornamentals and forest trees. 
Ent. 5 
Use of Insecticides to Prevent Borer Damage to Unseasoned Logs. 
Learn effectiveness of various insecticides and methods of appli- 
cation in preventing damage by wood boring insects to unseasoned 
logs and lumber. 
Ent. 59 
A Method to Minimize the Adverse Effect ay Tree Form of 
Attack by the White Pine Weevil. To compare (1) removal of all 
but one lateral branch in second-from-the-top whorl of branches 
with (2) retention of all laterals in this same whorl to learn 
effect of treatment (1) on subsequent development and straightness 
of a substitute main leader to take place of normal leader de- 
stroyed artificially to simulate attack by white pine weevil. 
For. 7h 
