Effect of geocarposphere temperature on pre-harvest colonization of drought-stressed peanuts by Aspergillus flavus and subsequent aflatoxin contamination |
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| Authors: | Paul D Blankenship Richard J Cole Timothy H Sanders Robert A Hill |
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| Institution: | (1) USDA, ARS, National Peanut Research Laboratory, 600 Forrester Drive, 31742 Dawson, GA, USA;(2) Department of Plant Pathology, University of Georgia, Georgia Coastal Plain Experiment Station, 31793 Tifton, GA, USA |
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| Abstract: | Florunner peanuts grown in research plots were subjected to 5 soil temperature and moisture treatment regimes resulting in A. flavus infestation and subsequent aflatoxin contamination in drought-stressed peanuts. Treatments imposed beginning 85 days after planting were drought, drought with heated soil and 3 drought treatments with cooled soil. The incidence of A. flavus in drought-stressed, unshelled, sound mature kernels (SMK) decreased with decreases in the mean 5 cm deep soil temperature. The incidence of A. flavus was greater in inedible categories and in damaged kernels than in SMK. The mean, threshold, geocarposphere temperature required for aflatoxin development during the latter part of the peanut growth cycle was found to be between 25.7° C and 27° C. |
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