Soybean Vein Necrosis Virus



SVNV is a relatively new virus capable of causing serious damage in soybeans. It is spread by soybean thrips and causes considerable loss of foliage, as plant tissue surrounding the veins begins to die.
SVNV is caused by soybean thrips and only overwinters in these insects or infected plant tissue throughout the southern United States. Once infected, thrips become lifetime transmittors of the virus. The soybean plant is infected by the thrip feeding on its tissue during plant vegetative and early reproductive stages.
Adult Thrip
Thrips are the only known transmitter of SVNV. Photo courtesy of Merle Shepard, Gerald R. Carner, and P.A.C Ooi. Licensed under CC BY 3.0.
Symptoms of SVNV begin as lesions along the leaf vein that turn the tissue yellow. This later becomes darker and leads to the death of the areas around the veins. The areas usually merge together to form larger dead areas. It's important to correctly diagnose this disease in order to prevent unnecessary and ineffective management strategies.
The virus associated with the disease is capable of causing serious crop losses. The disease is new enough that it is difficult to gauge the macro effects on soybean crops.
Traps can be used to capture thrips but have had limited effects to this point.
Due to the transmitter being soybean thrips, some farmers have resorted to pesticide use to limit the effects. This is not highly recommended due to lack of past successes with attempted control of disease vectors. Please contact your local plant pathologist to learn what is most effective in your area and how to use it best. Always read and follow all label instructions.