J. Agric. Sci. Mansoura Univ., 29 (4):1813-1822 (2004).
EFFECT OF IRRIGATION TECHNIQUE ON INCIDENCE OF POD ROTS AND AFLATOXIGENIC FUNGI IN PEANUT
Mahmoud1, E.Y. El-Deeb1, A.A., Mosa2, A. A. and M.M.Aly2
1Plant Pathology Res. Ins., Agric. Res. Center, Giza., Egypt
2Department of Plant Pathology, Faculty of Agriculture, Ain Shams University, Cairo, Egypt
Field studies were conducted in 2001 and 2002 to determine the effect of irrigation techniques, which included irrigation systems (furrow and sprinkle) and interval treatments (2, 4, and 6 days), which applied after three months from sowing, on the incidence of peanut pod rots (dry brown lesion, pink discoloration and general breakdown) and aflatoxigenic fungi (Aspergillus flavus and A. parasiticus). Generally, all categories of peanut pod rot incidence decreased with sprinkle irrigation system compared with furrow. Increasing the irrigation interval perform to decrease pod rot incidence as well as the moister percentage of peanut seeds. Pods having general breakdown were the most category affected on interval treatment following by dry brown lesion, while there were no significant effect on pods having pink discoloration. The occurrence of aflatoxigenic fungi on shells and seeds increased with increasing the irrigation interval in the two seasons. The content of aflatoxin in peanut pods was correlated with increasing the irrigation interval whether sprinkle or furrow system. Six-day interval with furrow system recorded the highest content of aflatoxin in the two seasons.
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Keywords: Peanut, groundnut, pod rots, aflatoxin production, aflatoxin contaminations, aflatoxigenic fungi, irrigation, irrigation techniques, sprinkle, furrow, Fusarium solani, Macrophomina phaseolina, Rhizoctonia solani, Sclerotium rolfsii, Aspergillus parasiticus, Aspergillus flavus and peanut yield