Egypt .J. of Appl. Sci.,22(12A): 34-50 (2007).
EFFECT OF LAST IRRIGATION TIMING BEFORE HARVEST ON PEANUT POD ROTS INCIDENCE AND OCCURANCE OF AFLATOXIGENIC FUNGI
Mahmoud, E.Y., Khaleifa M. M. A. and M. M. Ibrahim
Plant Pathology Res. Ins., Agric. Res. Center, Giza., Egypt
Greenhouse and field studies were conducted in 2005 and 2006 to study the effect of last irrigation timing before harvest namely 1, 4, 7, and 10 days, on the incidence of peanut pod rots and occurrence of aflatoxigenic fungi (Aspergillus flavus and A. parasiticus). Generally, all categories of peanut pod rot incidence (dry brown lesion, pink discoloration and general breakdown) as well as the moister percentage of peanut seeds significantly decreased with increasing the period between the last irrigation and harvest. Pods having general breakdown were the most category affected by increasing the timing of last irrigation following by dry brown lesion. Seven and ten-day time of last irrigation before harvest gave the highest percentage of apparent healthy pods compared to others treatments. The occurrence of aflatoxigenic fungi on shells and seeds increased with increasing the period between the last irrigation and harvest. In two seasons the content of aflatoxin in peanut pods increased by increasing the timing of last irrigation. Ten-day time of last irrigation before harvest recorded the highest content of aflatoxin in both seasons 2005 and 2006. The regression analyses showed significant linear relationship (P < 0.05) between last irrigation timing before harvest and percentage of seed infection by aflatoxigenic fungi. The relationship showed also positive significant correlation (P < 0.05) between last irrigation timing before harvest and percentage of seed infection by aflatoxigenic fungi.
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Keywords: Peanut, groundnut, pod rots, aflatoxin production, aflatoxin contaminations, aflatoxigenic fungi, irrigation, irrigation date, sprinkle, furrow, Fusarium solani, Macrophomina phaseolina, Rhizoctonia solani, Sclerotium rolfsii, Aspergillus parasiticus, Aspergillus flavus and peanut yield