Sclerotia of Sclerotinia minor were soaked in a conidial suspension (1.3 × 107 conidia/mL) of Penicillium citrinum at 25 ± 2 C for 1 h. This resulted in coating each sclerotium with about 3.7 × 104 conidia. Treated sclerotia were incubated either in the dark on dry or damp Whatman No. 1 filter paper or in pasteurized and nonpasteurized soil at 25 ± 2 C, for up to eight weeks. Colonization by P. citrinum of sclerotia incubated on damp or dry filter paper was 70 and 25%, respectively. Seventy four percent of sclerotia incubated in pasteurized soil were colonized and destroyed by P. citrinum, whereas 55% colonization and destruction occurred in sclerotia incubated in a nonpasteurized soil. Similarly treated sclerotia of Sclerotinia sclerotiorum variety major and Sclerotium rolfsii were incubated in pasteurized soil and colonized by P. citrinum at 45 and 5%, respectively, over the same period of time. Up to 50% colonization and destruction by P. citrinum has been observed on sclerotia of S. minor recovered from soil in a peanut field in Oklahoma. These findings suggest a potential use of P. citrinum as a biocontrol agent for S. minor.
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Keywords: Groundnut, Arachis hypogaea L
How to Cite:
Akem, C. & Melouk, H.,
(1987) “Colonization of sclerotia of Sclerotinia minor by a potential biocontrol agent, Penicillium citrinum¹”,
Peanut Science 14(2),
01 Jul 1987