Garlic allexivirus

Garlic allexivirus (Allexivirus epsalii) is a plant virus belonging to the genus Allexivirus within the Alphaflexiviridae family. It is a significant pathogen that is frequently identified in symptomatic garlic crops, often co-infecting plants alongside other viruses.

The virus primarily targets various species of the Allium genus, with garlic (Allium sativum) being the most economically important host. Infection often results in systemic physiological stress, leading to decreased bulb size and reduced quality of the harvest over successive growing seasons.

Visible symptoms of infection typically include mosaic patterns on leaves, chlorotic streaking, yellowing, and occasionally leaf twisting or stunted development. However, many plants may exhibit latent infection, where the virus is present without clear outward signs, yet still impacts plant vigor.

Transmission of Allexivirus epsalii is primarily facilitated by the garlic mite (Aceria tulipae), which acts as a vector, spreading the virus between plants. Furthermore, the virus is easily transmitted through the use of infected vegetative propagules (cloves) and through contaminated gardening tools during cultivation.

Management and prevention focus on the use of virus-free planting material, often obtained through tissue culture or meristem tip culture. Proactive measures include monitoring for mite populations, implementing crop rotation, ensuring thorough cleaning of tools, and rogueing out any symptomatic plants as soon as they are identified.