I. Lily blight
1. Symptoms Stems, leaves, flowers, and scales can all be affected, mainly in the young leaves of flowers. The leaves were damaged and there were small spots of water immersion and gradually enlarged into grayish green.
In the stem, the discolored part of the immersion spreads up and down, decays, and further develops into a stalk bent downward. In severe cases, pedicels and scales can also be affected. When the weather is wet, white mold layer is formed on the decayed parts such as leaves, stems and scales.
2. Prevention
1 The diseased plants found in the rotation and non-parasitic plants were cleared and burned in time;
2 soil disinfection. Perennial land masses need to be disinfected before planting. Can choose 40% formaldehyde (formalin) 30ml/m2, add 60 to 100 times of water to spray the seedbed, then cover the seedbed with plastic film, after 5 to 7 days, remove the cover for 1 to 2 weeks. Use; or use 75% pentachloronitrobenzene, 7 to 26 grams per square meter, mix well with the soil, and steam sterilize the soil for 30 to 60 minutes.
3 At the beginning of the disease, spraying Bordeaux mixture on stems and leaves also has certain control effect.
Second, lily leaf blight
1 Symptoms The main victims are the leaves and the stems of the plants. Flower buds and just sprouted buds can also be affected. Light brown, round or elliptic lesions appear on the leaves, and red-brown halos surround the lesions. In severe cases, large lesions are formed, causing early dryness on leaves, victimization of culms, perishable parts of the disease, and breaking off from here.
The lesions on the flowers are brown and sticky and rot. Victims of young plants often cause necrosis at the growing point. When the air is wet, there are brown-brown moldy layers on the lesions at all affected sites. The rotted parts of the plant sometimes have prominent sclerotia.
2 Prevention
(1) Lilies in greenhouses should pay attention to ventilation and light transmission, and the temperature difference between day and night should not be too large; watering should be poured from the plants to the ground, and can not be sprayed directly on the plants. Nitrogen fertilizer should not be too much. Diseased leaves are found, removed immediately and destroyed centrally to reduce the source of infection;
(2) Chemical control: In the susceptible season, Bordeaux mixture can be sprayed 1:100, or 75% chlorothalonil wettable powder 800 times, or 50% carbendazim 800 to 1000 times, or 50 times. % Benazelate WP 2500 times, spray once every 15 days, even spray 3 to 4 times.
In addition to the above two kinds of lily disease, flower farmers should also pay attention to lily virus disease, its symptoms are generally manifested as poor growth of diseased plants, leaves curled downward. If this virus is found, the flower farmer should remove the diseased plant and burn it in a concentrated manner. The virus can be sprayed with 40% chlormethoate EC 1000 to 1500 times solution or 50% CCV wettable powder 1000 times solution.
In addition, lily cannot be mixed with tulips. In addition, once a flower farmer finds out that a flower has a disease, he or she must consult a scientific and technical personnel to find out the condition, and then spray the liquid according to the condition to spray liquids indiscriminately to affect the growth and quality of flowers.
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