BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE 3 
Population and Host Preferences in Southern Wi 
and 1937: and Notes on Tobacco Insec - i . 
Sixty-nine articles on entomological and quan -'ere 
released to the press, and 68 radio talks were put on the air. Pre] 
tion of film-trip material covered 7 new subj 5. T o new motion 
pictures were completed, one on grasshoppers and the other on the 
M rmon cricket. Both are s ipartici] 
in 1 ts. One of these, sing material on bai 
cation, the white-fr:; _ "tie. the European corn Dutch 
elm :iese beetle, and _ 3, was stalled in the 
rotunda of the State Capitol at Jefferson City, Mo., from March 27 
through June "2. The attendance during which this material was 
on exhibit totaled over 66,000. 
operative extension work in entomology was supervised under the 
direction of the Bureau and the Office of Cooperative Extension Work. 
Twelve numbers of the Bureau Monthly News Letter were issued, 
comprising a total of 353 pages. In addition to those sent out on 
regular mailing lists and mis >us mimeographed material. 
850 copies of publications were distributed. 
During the year 2,615 orders for duplicating and photographic ma- 
terial were placed for 1,452,296 copies in all. Of these orders 618 
were for photographic work in the Bureau's laboratory, calling for 
9,980 prints and negative-. Ti:e duplicating work included general 
Bureau mimeographing, quarantine and administrative instructions, 
and B. E. P. Q. circulars. Thirty-three mailing lists were maintained 
in this division. 
To the file of photographic prints under the custody of this division 
there have been added 1,250 new subjects. A total of 1.339 prints have 
been distributed, on special request, to scientific workers, magazine 
editors, writers, student-, teachers, and others. 
FRUIT INSECT INVESTIGATIONS 
APPLE AND PEAR INSECTS 
Tank-mixed nicotine-bentonite has continued to give very satis- 
factory control of the codling moth under conditions of severe in- 
festation in southern Indiana. During 1938 this material was used 
successfully by several Indiana growers throughout most of the season 
on at least 700 acres. The need for the development of fungicides 
that will be compatible with nicotine-bentonite and not reduce its 
efficiency has been further emphasized. Some of the newer copper 
fungicides have been te-ted. but either they have interfered with the 
effectiveness of the nicotine-bentonite in codling moth control, or the 
combinations have caused serious foliage injury. In other areas the 
control obtained by the use of the tank-mix nicotine-bentonite has 
been rather satisfactory except that in some instances the residues have 
been objectionable and difficult to remove. 
Phenothiazine was tested further in southern Indiana, in the Pacific 
Northwest, and in the Hudson River Valley. For the most part the 
results were very poor. The reasons for this Lack of effectivene— have 
not been determined. Phenothiazine was found very effective in pre- 
venting secondary scab infestation, according t<> counts made in the 
Indiana plots by representatives of the Bureau of Plant Industry. 
