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Background  The root-knot nematode  Meloidogyne graminicola  has become a serious threat to rice production as a result of the cultivation changes from transplanting to direct seeding. The nematicidal activity of  Aspergillus welwitschiae  have been investigated in vitro, and the disease control efficacy of the active compound has been evaluated under greenhouse and field conditions.    Results  The active compound αβ-dehydrocurvularin (αβ-DC), isolated by nematicidal assay-directed fractionation, showed significant nematicidal activity against  M. graminicola , with a median lethal concentration (LC 50 ) value of 122.2 μg mL − 1 . αβ-DC effectively decreased the attraction of rice roots to nematodes and the infection of nematodes and also suppressed the development of nematodes under greenhouse conditions. Moreover, αβ-DC efficiently reduced the root gall index under field conditions.    Conclusions  To our knowledge, this is the first report to describe the nematicidal activity of αβ-DC against  M. graminicola . The results obtained under greenhouse and field conditions provide a basis for developing commercial formulations from αβ-DC to control  M. graminicola  in the future.

bmc microbiology

αβ-Dehydrocurvularin isolated from the fungus Aspergillus welwitschiae effectively inhibited the behaviour and development of the root-knot nematode Meloidogyne graminicola in rice roots