Control of Leaf spot of Zantedeschia

There are yellowish-brown spots on the calla lotus leaves, which not only affect the appearance, affect the mood, but also seriously make your pony die. This article introduces you to the symptoms and prevention of leaf spot disease!

Symptoms of horseshoe lotus leaf spot

When the disease occurs, the leaves will appear light brown or yellowish brown spots, most of which are round, oval or irregular. A few have very shallow wheel lines. In the later stage, the spots will gradually converge and form a lot of black mildew, which is the conidia of the pathogen, which, if not treated in time, will spread to the whole plant. Pathogen and incidence regularity Leaf spot is a fungal ☆ prohibited ☆ disease caused by fungal infection. The pathogen is stubborn and can survive the winter in the diseased leaves of calla lilies and spread by airflow.

Too high indoor temperature and humidity will accelerate the spread of the disease, and the damage is the most serious from July to October every year. In winter, the plant is based on indoor, once the temperature reaches 18-20 ℃, the disease can continue to spread, and the infected plant becomes the source of infection.

In the case of poor ventilation or extremely poor maintenance conditions, the incidence is more common.

Prevention and cure method

Strengthen cultivation management

According to the habits of calla lilies, put them in a shaded and ventilated place to reduce the incidence of disease. If directly exposed to the sun, it will weaken the growth of the plant and become ill. Put calla lilies indoors on the north side in winter.

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

Remove the source of infection in time

Remove the diseased leaves as soon as they are found. Before moving into the room in winter, thoroughly remove the remains of diseased leaves, loosen the soil properly, keep the surface of basin soil clean and reduce the source of infection.

Chemical control

When the disease is more serious, drug treatment can be used. At the initial stage of the disease, carbendazim can be diluted into 1000 times solution spray, once every 15 days, 3 times in a row.