Soybean curly top virus

Soybean curly top virus (lat. Soymovirus crispocestri) is a viral plant pathogen belonging to the Caulimoviridae family. This virus causes systemic infection in soybean plants, leading to severe physiological stress, which directly affects the formation of reproductive organs and the overall yield of the crop.

The primary host for this pathogen is the soybean plant (Glycine max). The disease is distributed across agricultural landscapes primarily through the feeding activities of insect vectors, such as aphids and leafhoppers, which transmit the virus during sap ingestion. Mechanical transmission via contaminated tools or infected seeds is also a possible pathway for the spread of the disease within fields.

Typical symptoms of infection include curling and crinkling of leaves, interveinal chlorosis, and stunted plant growth. Infected soybeans often display a reduced number of pods, and the seeds within those pods are frequently underdeveloped or deformed. The physiological impact is significant, as the virus interferes with photosynthesis and nutrient transport from the leaves to the developing seeds.

The severity of an outbreak depends heavily on environmental factors, particularly those influencing the population dynamics of insect vectors. Warm, dry weather conditions often promote the rapid reproduction and migration of these vectors, facilitating the spread of the virus across large areas. The presence of reservoir weeds that host the virus during the off-season is a key factor in early-season infection patterns.

Effective management and prevention strategies include the implementation of integrated pest management (IPM) to control insect populations and the use of certified, virus-free seed stock. Breeding for resistance is considered the most sustainable method for long-term mitigation. Furthermore, maintaining weed-free fields helps reduce the initial inoculum load, thereby protecting young plants during their most vulnerable growth stages.