Potato tepovirus T

The virus primarily targets species within the Solanaceae family, with potato plants serving as a major host for infection and replication.

Transmission occurs through mechanical contact between infected and healthy tissues, often during standard agricultural operations or handling.

Aphids play a critical role as natural vectors, facilitating the spread of the virus across fields during their feeding and movement.

The virus persists in vegetative propagules, making seed tubers the primary reservoir for initiating infection in each new planting season.

The most common symptom is a distinct mosaic pattern on leaves, manifesting as irregular light and dark green areas across the blade.

Infected leaves often show signs of curling, crinkling, and significant deformation, which impairs the plant's photosynthetic capacity.

Stunted growth is frequently observed, where plants appear smaller than their healthy counterparts and exhibit reduced vigor throughout the season.

Stems may appear spindly and fragile, indicating a systemic disruption caused by the virus during the early stages of plant development.

In advanced cases, premature yellowing and necrosis of the lower foliage occur, leading to early defoliation and diminished yield potential.

Disease spread is highly favored by warm, humid weather conditions that promote high population densities of aphid vectors in the fields.

High plant population density increases the probability of virus transmission through direct contact between leaves of adjacent plants.

The presence of weeds within or around the potato field acts as a hidden reservoir, allowing the virus to persist during off-seasons.

Inadequate field hygiene, such as failing to disinfect tools after pruning or handling, can lead to the rapid dissemination of the pathogen.

Excessive use of nitrogen fertilizers may create dense canopies that attract pests and create a microclimate conducive to viral spread.

The primary economic impact is a drastic reduction in total tuber yield, directly affecting the profitability of the potato crop.

Infected tubers often exhibit reduced size and poor storage qualities, making them unsuitable for commercial sales or long-term preservation.

Repeated use of seed potatoes from infected stocks leads to rapid variety degeneration, causing a permanent decline in crop performance.

The aesthetic quality of the harvest is compromised, as deformed tubers have lower market demand compared to healthy, uniform products.

Plants weakened by the virus become significantly more susceptible to opportunistic fungal and bacterial pathogens, leading to secondary rot.

The most effective strategy involves the exclusive use of certified, virus-free seed potatoes to ensure a clean start for the growing season.

Implementing regular phytosanitary inspections and promptly removing infected plants can significantly limit the spread of the virus.

Effective management of aphid populations using targeted insecticide applications is essential to break the cycle of virus transmission.

Maintaining clear boundaries and utilizing proper crop rotation cycles helps disrupt the lifecycle of the virus in the environment.

• Disinfecting all agricultural tools with appropriate solutions to prevent cross-contamination.
• Removing weed hosts from field margins to reduce the primary infection source.
• Prioritizing the cultivation of resistant or tolerant potato varieties in endemic areas.