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one treatment may result in control of two generate is ^f some species 
of insects.— Craighead and Broun (125) . 
In Canada a DDT insecticide distributed from a helicopter was 
ef festive.— Anosi. ^S) • 
Cyelohaxanoae-eil sprays containing 5 or 10 percent of DDT were 
applied with a hand atomiser and also by airplane at the rate of 6, 3 
or 2 pounds of Biff per acre* The sprays killed apparently all adults 
at the time of application and the plots remained practically free of 
moths for the remainder of the season* in spite of their abundance in 
the areas adjoining the plots* Meths eat ©ring the plots and those 
emerging from pupae appeared to have been killed in considerable num- 
bers by -the DDT residue on tbe foliage. The sprays were not effective 
however, against the pupae, eggs, or hatohing larvae* Observations over 
a 6-week period showed only 10 percent mortality of the young larvae 
seeking, or in, their winter quarters*— -Ross (306) . 
It may be possible to control two generations of the spruoe bud- 
worm with one application of BDT» It is also probable that fairly good 
coverage at the beginning of an outbreak would prevent subsequent 
build-up of infestation, and satisfactory control might be obtained 
with only one application.— Sheals and Craighead (514 ) • 
At chips rosaceana (Harr.), the oblique-banded leaf roller 
DDT applied both as a dust and as a spray gave practically 100 
percent control on 2 SO acres of raspberries and saved the crop* The 
deadly effect of the insecticide remained on the foliage for at least 
a month. The DDT was not unpleasant to handle and contrary to some 
fear, it apparently was not harmful to bees, even though the applica- 
tion had to be delayed until the full-bloom stage because of the late 
arrival of Hie material •— Burtner (99) • 
DDT is being recommended for the control of this insect in Oregon. 
— Childs (110) . 
Experiments carried on in the laboratory at Corvallis, Oreg., in 
the winter of 1943-44 proved that the DDT applied to the raspberry 
foliage would kill oblique-banded leaf roller worms that orawled over 
it •— Burtner (98). 
At Gresham, Oreg., various DDT inseotioides applied on small 
plots and fields involving some 250 acres of raspberries gave practically 
99 percent control of oblique-banded leaf roller with no apparent 
ctrsrs to bees or other beneficial insects. Insecticides tested were 
as follows: (1) If percent DDT dust, one application 2 weeks before 
blossoming period; (2) Gesarol A-20, 2 pounds per 100 gallons, one 
