Pathogenicity and Metabolites of YMF1.00683 against .

is a biological control agent with several registered products that can parasitize the eggs and larvae of various pathogenic nematodes. In this study, the pathogenicity and secondary metabolites of the fungus YMF1.00683 were investigated. The strain YMF1.00683 had infection efficiency against the plant root-knot nematode . The strain's process of infecting nematodes was observed under a microscope. Moreover, seven metabolites, including a new sterol (), were isolated and identified from cultures of YMF1.0068 in Sabouraud's dextrose agar. A bioassay showed that 5-methoxymethyl-1-pyrrole-2-carboxaldehyde () is toxic to and affects the egg hatching. It caused 98.23% mortality in and could inhibit 80.78% of the hatching eggs at 400 μg/mL over a period of 96 h. Furthermore, 5-methoxymethyl-1-pyrrole-2-carboxaldehyde () showed a strong avoidance effect at 40 ppm, and its chemotactic index value was -0.37. The results indicate that could produce active metabolites against .