Tulip Tissue Necrosis

The primary infectious disease is Augusta disease, caused by the tobacco necrosis virus (TNV). The virus enters the plant through the root system, with the soil-borne fungus Olpidium brassicae acting as the vector. Symptoms include the appearance of necrotic streaks, stripes, and spots on leaves, stems, and flowers, leading to stem distortion and the potential death of the entire plant.

Physiological necrosis is frequently observed during the tulip forcing process and manifests as the blackening and rotting of the bud while the leaves remain healthy, or stem drooping due to tissue necrotization. The primary causes of these disorders are considered to be deviations in bulb storage temperature, calcium deficiency, and exposure to endogenous ethylene. Specific resistance genes to this phenomenon have not been identified, and varietal resistance is determined by the plant's metabolic capacity and sensitivity to environmental conditions.