Soybean red crown rot caused by the soilborne fungus Calonectria ilicicola is emerging as a significant constraint to soybean production worldwide, requiring prompt action.

Abstract

Soybean red crown rot (RCR) is caused by the soilborne fungal pathogen Calonectria ilicicola. It causes root rot, leaf senescence, early defoliation, plant wilting and even death, often resulting in a severe reduction in seed yield and quality. C. ilicicola is an extremely difficult pathogen to control owing to its wide host range and long survival in soil and plant debris. Currently, no practically effective fungicide for this pathogen is available. Breeding for resistance is considered the most effective and environmentally acceptable means of disease management, but no C. ilicicola-resistant soybean variety has yet been identified. Given this situation, it is necessary to promote our understanding of the mechanism of RCR incidence and the development of a comprehensive and sustainable RCR management strategy urgently.