Colletotrichum Species Associated with Alfalfa Anthracnose: An Overview and Historical Perspective

Alfalfa anthracnose is an economically significant disease that leads to substantial biomass losses due to stem rot, reduced stand longevity, and a decline in forage nutritional quality. The disease is caused by multiple species within the genus <i>Colletotrichum</i>, including the 14 described species: <i>C. gloeosporioides</i>, <i>C. truncatum</i>, <i>C. lindemuthianum</i>, <i>C. destructivum</i>, <i>C. dematium</i>, <i>C. trifolii</i>, <i>C. medicaginis</i>, <i>C. graminicola</i>, <i>C. coccodes</i>, <i>C. sojae</i>, <i>C. spinaciae</i>, <i>C. lini</i>, <i>C. americae-borealis</i>, and <i>C. tofieldiae</i>. A thorough understanding of key aspects of the pathogen's biology, along with its epidemiology, infection cycle, and accurate disease diagnosis, is essential for the development of sustainable management strategies. Knowledge of these factors allows us to anticipate disease outbreaks, implement timely interventions, and design integrated control measures that reduce reliance on chemical fungicides while maintaining crop productivity and forage quality. Although anthracnose management has traditionally relied on synthetic fungicides, this review synthesizes alternative control strategies to clarify the current state of knowledge and to provide new insights into the development of effective and sustainable approaches for managing <i>Colletotrichum</i> species.