Rhizoctonia root-rot diseases in sugar beet: Pathogen diversity, pathogenesis and cutting-edge advancements in management research

Abstract

Sugar beet (Beta vulgaris L.), primarily grown in temperate regions for sugar and biofuel production, is vulnerable to several diseases including foliar and root diseases. These diseases result in significant yield losses and impact grower profitability. Of all the diseases, Rhizoctonia causing diseases in sugar beet roots have always been a challenging problem for achieving high sugar beet production and yield. Heavy crop losses ranging from 30% to 60% or at times complete failure has been recorded in sugar beet depending on the disease severity and pathogen incidence. Rhizoctonia spp., a soil-borne saprophytic fungus, is a common and highly damaging pathogen causing root and crown rot diseases globally, as well as losses during storage. Managing these diseases is crucial. Resistant varieties and genome editing have helped, along with fungicides and biological measures. This comprehensive review provides an updated understanding of Rhizoctonia root rot diseases in sugar beet, covering various aspects such as pathogen diversity, pathogenesis, and anastomosis groups of this fungus. Furthermore, it sheds light on the advancements in management research for Rhizoctonia diseases, including the exploration of biotechnological approaches and biological control methods. These innovative strategies hold the potential for sustainable disease management, reducing reliance on conventional fungicides and minimizing environmental impacts.