Arracacha virus B Oca strain

Arracacha virus B (Oca strain) is a plant pathogen classified within the Secoviridae family. As a viral agent, it poses a significant challenge to agricultural production, particularly in regions where susceptible crops are propagated vegetatively, allowing the virus to persist from one season to the next.

The host range of the virus includes several Andean root crops, with Arracacia xanthorrhiza and Oxalis tuberosa (Oca) being primary hosts. Furthermore, the virus is known to affect potatoes, making it a subject of concern for breeders and farmers alike due to its potential impact on tuber yield and quality.

Symptoms in infected plants vary but typically manifest as foliar mosaics, chlorotic spotting, leaf curling, and overall stunted growth. In many instances, the viral infection leads to a decrease in tuber size and uniformity, which negatively impacts the marketability and economic value of the potato crop.

The spread of the virus is largely facilitated by the movement of infected plant tissues. Additionally, specific species of soil-borne nematodes, such as Longidorus spp., serve as natural vectors, transmitting the virus during feeding. Environmental factors such as soil moisture and temperature play critical roles in the activity of these vectors.

Effective management strategies require a multi-faceted approach:

• Utilization of certified virus-indexed planting material.
• Rigorous roguing of symptomatic plants to reduce inoculum sources.
• Implementation of long-term crop rotation to manage nematode populations.
• Sanitation protocols for tools and machinery to prevent mechanical transmission in the field.