Soybean vein necrosis

Soybean vein necrosis, caused by the virus Orthotospovirus glycininecrovenae, is a viral plant disease that significantly impacts legume production. As a member of the Orthotospovirus genus, this pathogen requires specific insect vectors to effectively transmit the infection between plants in a field environment.

The primary host for this pathogen is soybean (Glycine max). While the virus demonstrates a high affinity for soybean, its presence can be detected in various alternative hosts, including certain weed species that act as reservoirs, ensuring the survival and persistence of the virus between cropping seasons.

Symptoms typically manifest as distinct chlorotic spotting or streaks that develop along the leaf veins, later progressing into necrosis. The foliage may show signs of yellowing or curling, and severely infected plants often exhibit stunted growth, reduced pod set, and lower seed quality, leading to substantial yield losses across the affected acreage.

Transmission occurs primarily through thrips. These insects acquire the virus during feeding and spread it through the canopy as they migrate between host plants. The prevalence and severity of the disease are highly dependent on local thrips population dynamics, which are in turn influenced by temperature, humidity, and the availability of host weeds.

Managing the disease requires an integrated strategy to minimize impact:

• Scouting fields regularly for thrips and implementing targeted insecticide applications.
• Selecting resistant or tolerant soybean varieties suited for the region.
• Removing weed hosts from field borders to reduce viral inoculum sources.
• Practicing rigorous sanitation of equipment to prevent mechanical spread.
• Implementing crop rotation to manage vector populations effectively.