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Research Concurrent Infection of Individual Corn Kernels with White and Green Isolates
of Aspergillus flavus. Natale Zummo, USDA-ARS, Department of Plant
Pathology and Weed Science, Mississippi State University, Mississippi State
39762. Plant Dis. 75:910-913. Accepted for publication 6 March 1991. This
article is in the public domain and not copyrightable. It may be freely
reprinted with customary crediting of the source. The American Phytopathological
Society, 1991. DOI: 10.1094/PD-75-0910. When ears of maize (Zea mays) were needle-inoculated in the field with
a white conidial isolate of Aspergillus flavus at 2 days after midsilk,
then reinoculated 4 days later with a green conidial isolate of the fungus, both
isolates could be recovered from individual kernels. Both isolates also were
recovered from individual kernels from reciprocally inoculated ears. Percentage
of kernel infection with the green conidial isolate was higher overall than that
with the white isolate in tests over a 3-yr period. Inoculation of ears first
with the white isolate, then with the green isolate reduced the amount of
infection obtained with the green isolate, whereas inoculation first with the
green isolate, then with the white isolate did not influence the amount of
infection obtained with the green isolate. Time of inoculation with the green
isolate did not influence kernel infection with the white isolate. Percentage of
infection was higher after inoculation with both isolates than after inoculation
with a single isolate. Individual isolates or both isolates could be recovered
from the same kernel or from separate, transversely cut kernel segments. The
white isolate was recovered from significantly more center kernel segments than
from other segments. Recovery of both fungal isolates from segments from most
regions of the kernel supports earlier findings that A. flavus infects
kernels mainly through the pericarp. |