atae 
_ Mean Plants 
Plant- tassel- showing Borer Ratios between borer 
Group ing ing tassels survival survivals 
date date July 2 (mean 4) Groups :Groups :Groups 
(July) Hearth )a. =: 1 and 2:3 and 4:2 aname 
2 May 19 17.25 94.8 2050 1.20 —— -- 
2 May 19 21.45 66..7 10.30 -- -- 1.33 
i) June 2 25.30 20en tsh5 = 1.21 -- 
4 June 2 29.50 om h 6.41 = — -- 

The borer survival on the group of strains tasseling 4 days 
earlier within each planting date was 1.20 and 1.21 times as great 
as the survival on the group tasseling latest, whereas the borer sur- 
vival on the group of strains of the May 19 planting which ‘tasseled 
4 days earlier than the earliest tasseling group of the June 2 plant- 
ing was 1.33 times as great as the survival on the group planted June 
2. The slightly greater level of borer survival on the May 19 plant-— 
ing, when compared with the emergence of the tassels, is :probably ac- 
counted for by the greater leaf area of the plants, which affords © 
greater opportunity for the young borers to find new locations on the 
plants wien blown off by the wind. The difference between 1.330 and 
1.205 is possibly accounted for in this manner. Also, it is noted 
that the percentaye of plants showing tassels on July 23 in: the dif- 
ferent groups is, roughly, as 1 is to 30,'60, and 90. It appears 
from the study of this one year that the reason fur the decrease in 
the survival of the borer on corn planted later as compared with corn 
planted earlier, is ayparently the same as the explanation for the 
difference in the borer survival between different strains cf corn 
planted on the same date, and that the availability of the tassels is 
associated closely with the differences in’ the survival of the corn 
borer. , 
Corn borer control tests with low-cutter harvester-shredder com- 
bine.--M. Schlosberg and R. T. Everly, Toledc, report that in connec- 
tion with the experimental development of a machine designed to com- 
bine the operations of low cutting of the corn plants, harvesting of 
the ears, and shredding of the stalks in one operation, following 
prelininary trials in 1932, tests were made during 1933 to determine 
the efficiency and control value of the machine for different corn 
borer populations harbored in the plants. The machine is being de- 
veloped by the Bureau of Agricultural Engineering, and the project 
cooperatively conducted with the same bureau on the U. S. Department 
of Agriculture Experiment Farm, near Maumee, Ohio. Approximately 20 
acres of corn were harvested by the machine on the U. S. Department 
of Agriculture experiment farm, near Maumee, Ohio, in November 1933, 
