Strains of field corn resistant to the survival of the European corn borer. Page: 2
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2 TECHNICAL BULLETIN 823, U. S. DEPT. OF AGRICULTURE
ceive more eggs than plots of shorter corn, and that smaller numbers
of borers resulted from a given number of eggs laid on strains that
would be in a relatively less advanced stage of growth at the time of
borer hatching. The population of borers to be expected in each
strain was predicted on the basis of the multiple regression of borer
population on strain height at the time of oviposition and strain
silking date. The strains that consistently contained less than the
predicted number of borers were classed as inherently borer resistant.
Marston4 mentioned the possible influence of strain maturity on
resistance. He interpreted his data on the basis of percentage of
plants infested and the number of borers per 100 plants.
Ficht 5 also indicated the possible importance of the maturity of
strains in evaluating their borer resistance. He reported the numbers
of full-grown larvae surviving on different strains as a percentage
of the estimated number of eggs deposited naturally on a given
number of plants.
Thompson 6 reported the performance of various strains of standard
and hybrid corn under natural infestation on the basis of the
average number of borers per 10 stalks.
It is the purpose of this bulletin to show the relative resistance to
corn borer survival contributed by inbred lines of field corn to hybrid
combinations. The measurement of the relative resistance is the
percentage deviation of the observed population of borers from the
predicted population on the date of silking of the strain. The predicted
values were obtained from the analysis of covariance.
During the 10-year period from 1930 to 1939 tests of the material
available have been conducted for the purpose of discovering inbred
lines of corn that would contribute resistance to corn borer establishment
and survival. During the early years of the work singlecross,
three-way cross, and a few double-cross hybrids and openpollinated
varieties were used, with inbreds Ill.A, Ill.R4, Ill.Hy,
Ill.L, I1.A48, 111.90, and Ind.TR predominating in the pedigrees
of the hybrids. From 24 to 36 strains were tested from 1930 to 1935,
inclusive, the number being limited by the fact that the tests were
made at several levels of borer population induced by varying the
number of egg masses placed on the plants.7
During the early tests certain hybrids showed a decided resistance
to survival of larvae of the corn borer, and other hybrids showed a
marked susceptibility. 'These resistant and susceptible hybrids were
used as standards for evaluating the results obtained from later
experiments. In 1936 and 1937 the emphasis was placed on determining
the relative borer survivals in these hybrids as related to the
stage of plant development at the time of hatching of the eggs and
on determining when and where the differentiation in borer survival
4 MARSTON, A. R. RECENT PROGRESS IN BREEDING BORER RESISTANT CORN. Mich. Agr. Expt. Sta
Quart. Bul. 15: 264-268, illus. 1933.
S FICHT, G. A. RELATIVE RESISTANCE OF SELECTED STRAINS OF CORN TO EUROPEAN CORN BORER. JOUr.
Econ. Ent. 29: 687-691. 1936.
6 THOMPSON, R. W. NOTES ON CORN BORER RESISTANCE IN HYBRID CORN. Ontario Ent. Soc. Ann. Rpt.
(1937) 68: 28-32, illus. 1938.
7 PATCH, L. H., STILL, G. W., APP, B. A., and CROOKS, C. A. COMPARATIVE INJURY BY THE EUROPEAN
CORN BORER TO OPEN-POLLINATED AND HYBRID FIELD CORN. Jour. Agr. Res. 63: 355-368, illus. 1941.
PATCH, L. H., STILL, G. W., SCHLOSBERG, M., and BOTTGER, G. T. FACTORS DETERMINING THE REDUCTION
IN YIELD OF FIELD CORN BY THE EUROPEAN CORN BORER. [To be submitted for publication.]
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Patch, L. H.; Holbert, J. R. & Everly, R. T. Strains of field corn resistant to the survival of the European corn borer., book, May 1942; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc3504/m1/2/: accessed February 17, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.