Diseases and prevention methods of Eustoma

Diseases of Eustoma: Stem blight

symptom

Stem blight is mainly caused by fungal infection, which will harm the stems of lisianthus. High temperature and high humidity environments are prone to stem blight.

After becoming ill, the cortical tissue of the lisianthus stem rots, small gray-white spots appear, and then spread up and down the lisianthus stem to the entire plant.

In the later stage, the disease becomes serious, the diseased part becomes dark brown and dry rotten, forming oval brown spots and black mold, causing the leaves to dry up or the whole plant to die.

Prevention and treatment methods

During normal breeding, pay attention to improving ventilation and reducing planting density.

Apply fertilizer reasonably, control the amount of nitrogen fertilizer, and add phosphorus and potassium fertilizers appropriately to improve the plant's disease resistance.

If the plant is already diseased, spray 1% Bordeaux mixture at the early stage of the disease. In severe cases, use 500 times diluted 50% thiophanate-methyl wettable powder and 500-800 times diluted 50% paracetamol wettable powder alternately, spraying once every 3-5 days.

Diseases of Eustoma: Root Rot

symptom

Root rot is also a fungal disease. The pathogen overwinters in the soil and on diseased remains. It usually occurs in late March to early April, with the peak season in May.

In the early stage of the disease, the plant does not show symptoms, and black necrotic spots form on the rhizomes. However, as the root rot worsens, the ability to absorb water and nutrients decreases, and the new leaves gradually turn yellow. In the later stage, the leaves of the entire plant turn yellow and wither, leading to the death of the entire plant.

Prevention and treatment methods

Before sowing, disinfect the seeds by mixing them with 0.3% of the weight of the seeds' thiophanate-methyl or 0.1% of the weight of the seeds' oxycarboxin, or soaking them in 2000 times diluted 80% 402 antibacterial agent emulsion for 5 hours. The base of the cuttings can also be soaked in the same concentration of solution for 1 hour before cutting.

Generally, apply well-rotted fertilizer, control the time and amount of watering, and avoid water accumulation.

In the early stage of the disease, 600 times diluted 50% carbendazim wettable powder can be used and sprayed once every 10 days or so for 2-3 times in a row.