Disease control of iris

Soft Rot

Water-like spots will appear on the leaves of the plant, and the growth of young shoots will be stunted. The tissues in the infected area become soft and rotten, and an unpleasant odor is emitted. In the early stage of the disease, the roots grow normally, but in the later stage they turn yellow and transparent and gradually rot.

Prevention

When the disease occurs, spray 1000-1300 times of streptomycin sulfate or agricultural streptomycin solution, or 500-600 times of Benomyl wettable powder solution in time. Once every 5 to 7 days, spray 2 to 3 times continuously.

Rust:

Early summer is the peak season for rust disease. When the disease occurs, rust-like spots will appear on leaves, petioles, buds and young branches. Leaves older than two months are usually not infected, and the disease mainly affects young leaves and tender branches.

Prevention

Remove diseased buds in time in early spring. The diseased buds are bright yellow in color, have a special shape, and bloom early, making them easy to identify. Removing them in time is very effective in reducing the source of infection. When cleaning, be careful to prevent the spores on the diseased buds from flying around, otherwise the preventive effect will not be achieved.

During the outbreak period, spray 100 times of mancozeb fungicide for killing and prevention.

Sclerotium rolfsii

White rot mainly harms rhizomes, causing rot and affecting plant growth.

Prevention

When plants are infected with white rot, the important source is the soil, so the soil should be turned over and disinfected every winter, and the remains of diseased plants (rotten rhizomes) should be removed in time.

Strengthen maintenance, water, fertilize and loosen the soil in a timely manner to promote vigorous growth of plants and improve their disease resistance. Pay attention to sun protection in summer to reduce the risk of burns.

In the early stage of the disease, water the roots with copper sulfate solution. Or use methyl tolclofos emulsifiable concentrate and mix it with water for spraying. Once every 10 days.