Iris disease control

Iris bulb rot

Symptoms

It mainly harms the bulbs, causing them to turn black or even blue-brown, with spores covering the surface. Usually the above-ground parts are not visible or appear very late, which seriously affects the growth of underground rhizomes.

Prevention and treatment methods

The air humidity should be less than 70% and the air should be kept circulating during storage.

Iris crown rot

Symptoms

Infected plants generally develop normally in the early stages, but then they wilt and fall over, their bulbs become completely soft, and the plants become covered with white fabric.

Prevention and treatment methods

Disinfect the soil and bulbs before planting to completely eliminate the source of infection.

When diseased plants are found, remove them promptly and clean the surrounding soil to avoid secondary infection.

Iris Botrytis cinerea

Symptoms

Plants infected with this disease have their growth stunted, their sheaths and leaves affected by wet rot, and are covered with a gray spore web from the ground upwards. Although the leaf tips are not yellow, the plant still falls over.

Prevention and treatment methods

The bulbs should not be too dense when planting, and the soil should be free of weeds during the growing period.

Maintain soil moisture at around 80% and keep the plants dry. Water in the morning or morning as much as possible, and expose the plants to sunlight immediately after watering.

When spots appear on the plants, spray fungicides in time.

Iris root rot

Symptoms

The plant's growth is stunted or its root system is short or it has blackheads that are difficult to see. There are black spots on the roots, making them look like they have been burned, but the new roots are growing well.

Prevention and treatment methods

Prepare the bulbs before planting and choose suitable soil.

Use proper watering techniques to prevent waterlogging in the soil.

Iris White Flower Disease

Symptoms

The flower color is different from that of normal plants, the color is lighter, the flowers are not dry but the quality is obviously reduced.

Prevention and treatment methods

If the relative humidity in the greenhouse is high during the entire growing period, maintain the room temperature 2~3 ℃ higher than the outside temperature. If the outside temperature is high ( 15~16 ℃) and this method cannot be used, the greenhouse should be heated in the morning and the ventilation fan should be turned on.

Iris bud blast

Symptoms

This disease can occur throughout the entire growing period, but in the early stages of flower stem growth, almost no changes are visible. However, the flower buds developed poorly in the later stage and the flowers were difficult to color, which was probably due to bud split disease.

Prevention and treatment methods

Select bulbs before planting and treat the soil during the planting period.

Strengthen maintenance and management to ensure sufficient light and enough water. Lower the room temperature appropriately on rainy days. Pay attention to ventilation and cooling in hot and humid weather to ensure that the plants are full of vitality. Avoid sudden drops in temperature during maintenance, as this will cause unbalanced plant growth and make the plants more susceptible to bud split disease.