What to do about Calla Lily Leaf Spot Disease

Leaf spot symptoms

When the disease occurs, light brown or yellowish brown spots will appear on the leaves, most of which are round, oval or irregular in shape. A few have very shallow ring marks. In the later stage, the spots will gradually aggregate to form many black mold-like substances, which are the conidia of the pathogen. If not treated in time, they will spread to the entire plant. .

Pathogen and pathogenesis

Leaf spot is a fungal disease caused by fungal infection. The pathogen is quite stubborn and will overwinter in the diseased leaf debris of Calla Lily and spread with the help of air currents.

Excessively high indoor temperature and humidity will accelerate the spread of the disease, with the most serious damage occurring from July to October each year. In winter, the plants are kept indoors. Once the temperature reaches 18-20 ℃, the disease can continue to spread, and the diseased plants become the source of infection.

The incidence is more common in cases of poor ventilation or extremely poor maintenance conditions.

Prevention and treatment methods

Strengthen cultivation management

According to the habits of Calla Lily, place it in a shaded and ventilated place to reduce the incidence of disease. If exposed directly to sunlight, the growth of the plant will be weakened and the plant will become diseased. Place calla lilies indoors in a north-facing location during the winter.

Reasonable watering and fertilization can promote vigorous growth of plants and improve their disease resistance.

Eliminate the source of infection promptly

Once diseased leaves are found, remove them immediately. Before moving indoors in winter, thoroughly remove diseased leaf debris, loosen the soil appropriately, keep the surface of the potting soil clean, and reduce sources of infection.

Chemical control

When the disease is more serious, medication can be used to treat it. In the early stage of the disease, you can use carbendazim diluted into a 1000 times solution and spray it once every 15 days, and spray it three times in a row.

Knowing the past and present of leaf spot disease, you can definitely nip it in the bud, and your baby calla lily will be great!