There are many diseases in planting lily, five common disease symptoms of lily and their control methods.

Lily, belongs to Liliaceae, perennial root plant, also known as wild lily, medicine lily. In recent years, lily planting is seriously threatened by diseases such as leaf blight, blight, bulb base rot, virus disease and so on. In general, the incidence of lilies is 10%-15%, and the serious ones can reach 20%-30%.

1. Five major diseases on lilies

Lily leaf blight

(1) Lily leaf blight, also known as lily gray mold. It mainly harms leaves and can also infect stems, buds and flowers. The color of the round or oval spots on the leaves is light yellow to light reddish brown, of different sizes and watery. Under warm and humid conditions, the disease spot becomes thin and brittle, light gray, translucent, and in serious cases, it can cause the whole leaves of lily to die. The stem of the lily became brown or constricted where the virus was infected, resulting in the collapse of the plant. When the young plants of lily were infected, the growth point of stems and leaves became soft, rotten and died. Lilies in the flower bud stage are infected with small brown spots at the beginning of the disease, then spread to the entire bud and eventually rot.

Lily virus disease

(2) Lily virus disease. The diseased plant showed mottled mosaic, light green and dark green. The seriously diseased lily plants were obviously dwarfed, the scales were short, and some showed brown and necrotic spots.

Lily rot

(3) bulb basal rot. The base of the stem that mainly harms the lily usually begins to develop when the lily blossoms, the base of the lesion becomes dark brown and rotten, the leaves droop and turn yellow, resulting in death.

Lily leaf tip blight

(4) Leaf tip blight of lily. It mainly harms leaf tip. After the lily leaf tip was infected with the virus, it became dark brown, necrotic or dry, and continued to spread to the base of the leaf. The leaves were damaged in the middle, forming oval or spindle-shaped, brown or reddish brown edges, gray-white disease spots in the center, and many small black spots scattered on the diseased part of the lily leaves. Leaf tip blight usually occurs in June.

Lily blight

(5) Lily blight, also known as lily foot rot. It mainly damages the stems and leaves of lilies. The leaves affected by the virus will produce water-stained gray-green to brown spots with no obvious edges. When the disease is serious, water-stained brown spots and rot also appear on flowers and bulbs, and sparse white mildew layers grow in the diseased parts of lilies when the weather is wet. Stem and stem base disease, initially waterlogged, brown wrinkle stripes, gradually upward and downward expansion, resulting in stem rot, lily plant withered and collapsed.

2. prevention and control measures

The main results are as follows: (1) the robust disease-free lily bulb should be selected, and the best management of the storage period of the bulb should be done to prevent the loss of water. Virus-free bulbs should be planted to prevent virus diseases. One is to propagate through lily seeds, and the other is to do stem tip treatment, and then take the stem tip of 0.1~0.2CM for tissue culture to obtain virus-free seedlings. However, virus-free seedlings must be planted in isolation and aphids must be controlled to prevent natural infection.

(2) before sowing, soak the lily bulb in a solution of 500 thiram or 50 times the concentration of 40% formaldehyde for 15 minutes.

(3) to strengthen the field management, the fields planted with lilies should have high border and deep ditches, and the border surface should be smooth to facilitate drainage, and wet lily leaves should be avoided during irrigation. Improve ventilation, light conditions, increase the application of phosphorus and potassium fertilizer, make the plant grow healthily and enhance the disease resistance.

(4) remove the diseased plants in time, thoroughly remove the remains of lily disease left in the field, and burn them centrally. After pulling out the diseased plant, disinfect it with 50% lime milk.

(5) for chemical control, 50% carbendazim wettable powder 1000 times can be sprayed 2 times 3 times after the emergence of lily seedlings, and the diseased seedlings can be pulled out in time. For the disease of lily, we can choose 25% metalaxyl solution diluted 2000 times with water, 40% ethyl phosphorus aluminum solution diluted 300 times with water, 70% dimethazone powder diluted 1000 times solution or 70% thiophanate 1000 times solution to spray lily. Spray the medicine all over the base of the stem of the lily plant and the soil around it.