Impatiens are susceptible to downy mildew , and the seven methods recommended by experts in downy mildew infection:
The first is to find out the cause of the infection. Downy mildew is most likely to be infected by plugging seedlings, cuttings, and plants themselves. It is also possible that infected spores infect the garden plants with the wind. If the grower breeds plant material in the area where the African Impatiens garden is grown, it is highly probable that the plant material will be infected with downy mildew by airborne spores. This requires the grower to detect early symptoms in a timely manner and take preventive measures. Detect the humidity of the greenhouse environment and minimize the humidity of the environment and the moisture time of the blade.
The second is to purchase disease-free plants. Because of the varying levels of growers, the purchase of disease-free plants is essential to prevent downy mildew. Experience has shown that Impatiens seedlings bred by seeds are not infected with downy mildew, and the asexually propagated Impatiens seedlings may be infected. In the actual production process, it is recommended to plant seedlings and vegetatively propagated seedlings separately, or to manage plant materials from different sources separately to avoid cross-infection.
Smart growers should purchase seedlings from suppliers that are environmentally sound and in compliance with the operating procedures. The purchased seedlings should be planted separately from other African balsam varieties to avoid mutual infection. Before the seedlings are planted, the disease should be carefully checked for signs of infection.
The third is to check the symptoms of the disease. Growers must establish strict observation procedures to teach employees to identify the many symptoms of pathogen infection. Seeds that have just been purchased should be carefully examined for the symptoms and characteristics of downy mildew. Since the pathogen is organized, any management measures may not help once the plant is infected.
The observation of cutting seedlings should be more careful, especially in the case of cutting seedlings under spray-humidification conditions for 11 days to 14 days. Due to the humid environment, white mycelium or spores are prone to appear on the back of the leaves, if the leaves appear spots, chlorosis, edge orientation Symptoms such as lower curls prove that the plant has been infected and should be immediately removed for destruction to prevent the infection from expanding.
The fourth is to destroy diseased plants. Once the symptoms are confirmed, measures should be taken to immediately destroy the infected plants. After discovering plants infected with spores in the greenhouse environment, the plants should be sealed in sealed bags to avoid further spread of the spores. Since the carrier spores in the air have a short life span and do not survive in a dry and parasitic environment, the spores in the air do not cause long-term hazards as long as the infected plant is partially disinfected.
The fifth is to use a suitable fungicide . Ms. Margaret Dotley, a plant pathologist at Cornell University in the United States, said: “Whether it’s a grower, a retailer, or a garden manager, a complete chemical control plan must be developed for each year of the year. The season thoroughly controls downy mildew. Secondly, the plants purchased from different places are treated with fungicides before they can be planted. In addition, the plants are planted or cut for about two weeks, and the fungicides can be used at intervals, once a week. The use of fungicides is more important to avoid the development of resistance to pathogens, thereby reducing the bactericidal effect.
Sixth is to avoid infection in the sales chain. The manufacturer should inform the flower retailer to take precautions during the sales process and avoid the repeated use of the flower bed placed on the flower sales to cause infection. Proper disinfection should not be ignored.
Seven is to use seedlings as much as possible. The study found that the 'SunPatiens' variety of Japan Putian Company and the 'Celebration' New Guinea Impatiens seedlings of the American Paul Company are not susceptible to downy mildew, which is very suitable for garden planting.
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