SYSTEMIC FUNGAL INFECTION ON Jatropha Curcas L. ACCESSIONS CAUSED BY Lasidioplodia theobromae (Pat.) GRIFFON AND MAUBL IN SOUTH-WEST NIGERIA

  • J.O. Nwogwugwu Plant Pathology Section, Department of Forest Conservation and Protection, Forestry Research Institute of Nigeria, PMB 5054, Jericho Hills, Idinshin, Ibadan, Oyo State
Keywords: Biodiesel, Disease incidence, Pathogenicity, Screenhouse, and Physic nut

Abstract

Jatropha curcas L. (Physic nut) is a species grown around the world for its great potential for the production of
biodiesel and other useful industrial and medicinal purposes. Lasiodiplodia theobromae was implicated in
systemic infection of the oil-bearing plant, physic nut causing high disease incidences and severities of leaf
chlorosis, collar and root rots, wilting and eventual death of plants.Investigation and isolations were made from
observed symptoms on four jatropha accessions under field and screen house conditions. Pathogenicity test using
Koch's postulate was completed by re-isolating L. theobromae fungus from the developed symptoms after
artificial inoculations on four weeks old seedlings raised in the screenhouse. Results show high incidence of
symptomatic and systemic infection on Jatropha curcas caused by the pathogen, L. theobramea. The most
observed symptom was root rots with least disease incidence recorded on Ex-Misau accession (38.5%). Disease
severity was not statistically different in all the accessions tested. Vascular damage on the seedlings with evident
symptoms of rots and foliar chlorosis led to eventual death. This study infers that sustainable disease
management strategies should be intensified to compliment the efforts made to maximize the production and
yield of this biodiesel species; without which growing this plant may serve a threat to other food crops grown as
companion crops with the species.

Published
2020-08-30

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eISSN: 0300-368X