
R. E. Kimport, of the Bayshore, L. I., corn borer sublaboratory, 
reports: "A number of plants were examined for infestation by the corn 
borer in the two-generation area of Long Island, and the following hosts 
were found: Corn, potato, lima bean, string bean, rhubarb, spinach, 
muskmelon, pumpkin, cucumber, tomato, dahlia, gladiolus, Sudan grass, 
barnyard grass, foxtail grass, eggplant, lamb's quarters, smartweed, rag- 
weed, pigweed, and dock. During this period * * * a survey was conduct— 
ed in lima beans on the eastern half of Long Island, This survey covered 
97 fields, totaling 145.77 acres, and from samples of 61 fields infesta- 
tion was shown. At the time of the survey a great percentage of the pods 
had been harvested; therefore, the percentage of plant infestation with 
no ped infestation was very large." 
According to the report of L. H. Patch, Sandusky, Ohio, "One 
strain of corn is designated as resistant to the corn borer, compared to 
another strain, if the percentage of eggs hatching and developing into 
mature borers on the first strain is less than the percentage of eggs pro-~ 
ducing mature borers on the second strain. During 1930, 2 strains of 
cOrn were found to be distinctly resistant to the borer; and Dr. J. R. 
Holbert's imbred strain R4 was father to the one and mother to the other. 
This year the original 2 strains and 2 more strains, with R4 as a parent, 
were tested with 20 other strains received from Doctor Holbert and others. 
It is encouraging to note that the 4 strains with inbred R4 as a parent 
were the lowest in borer survival this year also. The percentage survival 
of these 4 strains averaged 10.2. The percentage survival of the 24 
strains arranged in groups of 4 strains averaged as follows: 10.2, 13.1, 
15.9, 17.8, 20.4, and 22.0. Thus it is seen that the resistance to the 
borer this year of the 4 strains with inbred R4 as a parent was 2.16 
times greater than that of the 4 strains least resistant to the borer: and 
2.08 times greater than that of the 8 strains least resistant. Of the 
29 strains tested in 1930 the resistance of the 2 strains with imbred R4 
as a parent was 2.15 times greater than that of the 10 strains least re- 
sistant." 
A statement by Morris Schlosberg, of the Toledo, Ohio, corn borer 
experimental farm, says: "The number of mature corn borer larvae in corn 
plants resulting from the number of eggs laid on the particular corn varie— 
ty, expressed as a percentage figure, is termed the rate of larval sur- 
vival for that variety. - Studies embracing the cornfields on the Toledo 
farm reveal that approximately 17 per cent of the eggs laid on the farm 
resulted in mature larvae. This figure contrasts sharply with the 4.6 
per cent rate of larval survival obtaining in Lucas County, as determined 
by comprehensive surveys cooperatively conducted by the Bureau of Entomo— 
logy and Plant Quarantine and Control Administration, indicating, perhaps, 
the generally better corn conditions on the farm. A comparison of the 
seasons 1928, 1929, 1930, and 1931 shows, respectively, the following 
‘rates of larval survival: 354.6, 19.5, 4.6, and 17.1.. The survival rate of 
each season reflects the prevailing climatic conditions and the influence 
of these upon the corn plants and borer." 
C. A. Clark, of the Kobe, Japan, sublaboratory, reporting on work 
with parasites- of the European corn borer, states: "Laboratory-reared 
