Influence of planting date on aflatoxin accumulation in Bt, non-Bt, and tropical non-Bt hybrids

    Authors

    P. J. Wiatrak; D. L. Wright; J. J. Marois;D. Wilson

    Comments

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    Abbreviated Journal Title

    Agron. J.

    Keywords

    CORN-EARWORM LEPIDOPTERA; ASPERGILLUS-FLAVUS; BORER LEPIDOPTERA; NOCTUIDAE DAMAGE; TRANSGENIC CORN; PREHARVEST CORN; MAIZE KERNELS; FALL; ARMYWORM; HARVEST DATE; FIELD CORN; Agronomy

    Abstract

    Aflatoxin, produced by the fungus Aspergillusflavus Link, reduces the value of corn (Zea mays L.) and is usually associated with high temperatures, water stress, and insect damage. The objective of this study was to determine if Bt (Bacillus thuringiensis) corn hybrids or "tropical" germplasm could reduce aflatoxin accumulation with later planting dates. Aflatoxin accumulation (B-1, B-2, G(1), and G(2)) in corn grain was evaluated on Bt, non-Bt, and tropical non-Bt hybrids and four planting dates (March, April, May, and June) from 1998 to 2000. Aflatoxin concentration in corn varied across years but generally decreased with later planting date. In 1998, aflatoxin accumulation was lower in Bt (314 ng g(-1)) than non-Bt hybrids (634 ng g-1) but not different than tropical non-Bt hybrid (470 ng g-1). However, aflatoxin contamination was lower from Bt hybrids (70 ng g(-1)) than from the tropical non-Bt hybrid (259 ng g(-1)) but not different in non-Bt hybrids (86 ng g(-1)) in 1999. In 2000, aflatoxin levels were low, and hybrid had no effect on aflatoxin concentration. Temperature and irrigation effects on aflatoxin accumulation were not consistent. In-creased temperature and delayed harvest may lead to aflatoxin accumulation before harvest. However, precipitation may influence aflatoxin levels in some years. The results of this study indicate that aflatoxin accumulation in corn may be decreased with later planting date, and less accumulation in Bt than non-Bt or tropical non-Bt hybrids may be indirectly explained by insect reductions.

    Journal Title

    Agronomy Journal

    Volume

    97

    Issue/Number

    2

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    440

    Last Page

    445

    WOS Identifier

    WOS:000228037700012

    ISSN

    0002-1962

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