Celery mosaic

Celery mosaic is a plant disease caused by the Celery mosaic virus (CeMV), which belongs to the Potyviridae family and the Potyvirus genus. This virus is a significant pathogen that primarily targets plants within the Apiaceae family, including celery, celeriac, carrots, and various wild species that serve as primary reservoirs for the virus.

The primary symptoms of infection include characteristic leaf mottling, yellowing patterns, and crinkling or distortion of the foliage. Infected plants often show significant stunting, reduced vigor, and poor development of the edible parts, such as stalks or roots, which severely impacts the market value and yield of the commercial crop.

The biological cycle and transmission of the virus are primarily mediated by aphids. The transmission mode is non-persistent, meaning that aphids acquire the virus by probing infected plants for a very short period and transmit it to healthy plants almost immediately during their next feeding session. The virus does not require an incubation period within the insect vector.

The disease spread is heavily dependent on environmental conditions that favor aphid proliferation, such as warm and dry weather. The presence of wild Apiaceae hosts nearby is a critical risk factor, as these weeds facilitate the virus's survival during off-seasons and provide a constant source of infection for newly planted crops.

Effective management and control measures focus on breaking the infection cycle and minimizing the vector population:

• Maintaining field sanitation by removing reservoir weeds that host the virus.
• Implementing strict insect control programs to manage aphid populations using systemic or contact insecticides.
• Using spatial isolation to distance new plantings from existing, potentially infected crops.
• Selecting resistant or tolerant varieties of celery.
• Employing reflective mulches to deter aphids from landing on young seedlings.