Green stem syndrome
Area of impact: Stem
Description: Stems remain green long after they should be brown and mature. Usually occurs in individual scattered plants.
Pathogen involved: Unknown, but viruses such as bean pod mottle and soybean mosaic virus are most commonly associated with it.
Timing/Conditions: Usually appears as the crop is maturing.
Contributing factors: Viruses, dry soil, potassium deficiency, population density, genetic mutations and insect damage.
Management practices: Varietal selection may help but effective management strategies are not yet known.