Bacterial leaf spot of lily

Bacterial leaf spot is an important disease of lily, which occurs and distributes in some areas, and can occur in protected and open fields. Usually the diseased plant is 5% to 10%, which affects the yield and quality to a certain extent. The field incidence of seriously diseased land can reach more than 20%, which obviously affects the production of lily.

[symptoms]

The disease can harm all parts of lily, mostly showing symptoms of aboveground parts. At first, the green-brown nearly oval dots were dense on the leaves, then developed into near fusiform yellow-brown to dark brown necrotic spots, slightly sunken, the edges were flooded, green-brown, and connected to each other into irregular necrotic spots. The damp air causes leaf decay and necrosis in a short time. When the air is dry, the diseased leaves are light brown, necrotic and dry. With the development of the disease, the stem showed irregular light brown to yellowish brown necrosis, and then rotted or dried.

[pathogen]

I don't know. It is preliminarily identified as a kind of bacteria and needs further study.

[morbidity regularity]

It is observed that the disease mainly overwinters with seedlings or bulbs, and is transmitted with seedlings or corms with bacteria. When the conditions are suitable, the disease will spread through Rain Water, watering or pests to re-infect, resulting in the spread of the disease. Rainy and humid is good for the disease.

[prevention and control methods]

1. Strengthen quarantine and beware of transporting infected seedlings and bulbs.

2. Before planting, soak the seed bulb with 47 Mingjiarinong wettable powder 500 times, or soak the seed ball in 0.3% 0.5% hydrochloric acid solution for 5 minutes for 10 minutes.

3. Strengthen the field management and remove the diseased plants in time. Avoid flood irrigation and prevent stagnant water in the field after rain.

4. timely spraying and prevention in the early stage of the disease. See black rot of broccoli.