The common diseases of colored calla lily mainly include bacterial diseases, fungal diseases, and insect pests. The following are separately introduced. Bacterial Diseases E.coli: E. coli Disease Also Known as Soft Rot
The disease is caused by the disease caused by soft soft decay of carrots and Erwinia. The infected leaves and stems turn dark green, with spots of necrosis and rot, and secrete mucus, which eventually drains. The tubers also start to rot and become foul-smelling. When the plants grow poorly, infection can be caused by some small wounds. These bacteria can also secrete some enzymes to dissolve cell walls and penetrate plants. If the plants are dry, the infected plants and the soil they grow should be carefully removed. It should be noted that the infected tubers need to be picked out as soon as possible before planting, and disinfection precautions should be taken. The degree of susceptibility to infection with E. coli is also different due to the difference in breeds. In general, yellow and orange varieties are more susceptible to infection than white and cream varieties. The best way to control it is to provide the plant with an optimal growth environment throughout the cultivation so that it can ensure development without interference. The growth environment of colored calla lily should meet the following requirements:
Provide enough water (do not grow too shallow; water when the soil is dry);
The drainage performance of the soil is better to prevent the occurrence of excessive humidity;
Avoid overheating in the greenhouse, especially when the relative humidity is high;
Prevent damage to plants and tubers (prevent wind damage to plants, be careful not to let herbicides affect plant growth, and be careful when harvesting and handling);
Prevent damage caused by other fungal diseases and insect pests. (eg, damage caused by Pythium or Rhizoctonia may provide a harbor for the invasion of E. coli);
Do not use nitrogen fertilizer too much, because nitrogen fertilizer usage exceeding 150 kg per hectare can easily cause infection with E. coli.
Tubers should be dried as soon as possible after they are harvested: If there is a delay in the first week after harvest, there will be a lot of losses later. Fungal Diseases Pythium: This Fungus Causes Root Decomposition
Rottenness causes the plant's absorption of moisture to be limited. Rotation and precise irrigation (and drainage) are important factors in preventing infection. The soil is steam sterilized and treated with a bactericide before planting.
Rhizoctonia: The fungus damages the shoots of plants near the ground. Soil can be treated with tolclofos-methyl and fluoxamide to treat the soil.
Penicillium: The fungus can cause infection when tubers are stored, resulting in damage to the tubers during storage and storage, especially when the tubers are mechanically damaged, the relative humidity of the storage room is too high, or the air flow in the microenvironment is insufficient. Providing enough air to prevent the germs from occurring. Tubers can also be sterilized using fungicides, such as captan.
Botrytis: Occurs on flowers and leaves. Prevention of the combination of bactericide and insecticide is necessary every 10 days during open-air cultivation. Infection of Botrytis cinerea is almost always manifested as small spots on the leaves. It is sufficient to fight only once in late August or early September. Insect pests thrips and aphids grow throughout the plant
Damage will be caused in the process. Spraying with parathion twice before flowering, and using acephamide or deltamethrin for prevention every 7-10 days during cultivation.
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