Disease and pest control of Bletilla striata
Let me share with you some related experience about the propagation of Bletilla striata flowers, the disease and pest control of Bletilla striata. If there is anything wrong, please correct me!
The virus disease transmission route of Bletilla striata leaves: The host range is very narrow, transmitted during the contact with the diseased plant of Bletilla striata, but the damage is very serious, easily causing devastating damage and difficult to eradicate. Control method: Propagate from healthy plants. It is best to disinfect the tools to prevent mechanical transmission. Finally, work on the diseased plants and isolate and destroy them.
(T-J) Disease symptoms: Dense planting, poor ventilation, water imbalance, or mechanical damage can easily cause the disease. Initially, brown sunken spots appear on the leaves, which then expand to become round or irregular lesions. In severe cases, central necrosis occurs in the lesions.
Control methods:
(1) Reasonable dense planting, increase lighting, and improve ventilation and drainage conditions;
(2) Cultivate strong seedlings, do not move the plants frequently to avoid artificial damage and infection;
(3) Cut off the diseased leaves and apply a 1000-fold solution of carbendazim or validamycin to the plant leaf wounds;
(4) Spray 1 time a week with a 1000-fold solution of methylethyl thiophosphate or carbendazim.
Soft rot symptoms: In spring and summer, high temperature and humidity, poor ventilation, and excessive application of nitrogen fertilizer can easily cause this disease. Initially, bacteria invade the leaves or the heart leaves to form water-soaked lesions that quickly expand, contain a lot of water, and later emit a foul odor, the leaves turn yellow and fall off, and the whole plant rots and dies. The disease spreads very quickly and must be treated as soon as possible.
Control methods:
(1) Improve growing conditions, increase ventilation, reduce temperature and humidity;
(2) Cut off the infected parts, apply antibiotic powder, do not water for a week, which can prevent the spread of the disease;
(3) Use a 1000-fold solution of streptomycin, lime sulfur mixture, or Bordeaux mixture 500-fold solution, spray once a week.
Leaf blight symptoms: Black spots appear on the leaf tips, gradually expanding into irregular lesions, with blackish-brown edges and light gray-brown centers. In severe cases, it spreads to the entire leaf and finally withers and falls off.
Control methods:
(1) Cut off the diseased leaves and spray a 1000-fold solution of methylethyl thiophosphate or_validamycin;
(2) Shield the infected plants from rain or stop watering to prevent the condition from worsening;
(3) Spray a 1000-fold solution of_validamycin once a week to prevent infection.
Scales symptoms: There are two types, one with blackish-brown hard shell and the other with white powdery type. They often attach to the stems or the back of the leaves to absorb sap, causing growth obstruction, destruction of chlorophyll, and forming a large number of shallow yellow spots. In severe cases, it leads to leaf fall and the whole plant withers and dies.
Control methods:
(1) When the amount is small in the early stage, remove them by hand or brush, taking care not to damage the plant;
(2) Spray a 1000-fold solution of cislin once a week;
(3) Using dimethoate (also called dimethomorph) in the pot can also prevent for a long time.
Spider mite symptoms: Very small individuals, often gathered on the back of leaves to absorb sap, causing silver-white or white spots on the surface. In severe cases, silk nets can be found on the back of the leaves. Spider mites are more likely to occur in high-temperature and dry environments. When the temperature exceeds 24°C, they enter a rapid繁殖 period and are generally not killed by insecticides, miticides must be used.
Control methods:
(1) Observe the back of the leaves of the plants frequently during the hot and dry periods of summer and autumn, and eliminate the red spider damage immediately;
(2) Use a 1000-fold solution of dicofol, a 2000-fold solution of pyridaben, a 1500-fold solution of pyridaben, and spray once a week for 3-4 consecutive times.
Snail and slug symptoms: Snails have shells, while slugs do not, both are omnivorous soft-bodied animals. They like to eat the tender parts of orchid plants, such as young leaves, new buds, root tips, flower buds, and petals, causing irregular wounds and holes. The areas they crawl through usually leave a shiny and transparent mucous trail, and they should be treated promptly when found.
Control methods:
(1) Clean the cultivation environment, remove堆积 such as weeds, gravel, tree branches and leaves, reduce shade and humidity, and eliminate breeding grounds;
(2) Use snail powder or snail killer to control;
(3) Sprinkle 6% metaldehyde powder on the areas where snails and slugs appear; they die when they crawl over it.
Thrips symptoms: Mainly bite flower buds and leaf buds. The larval stage mainly occurs in the cultivation medium, and does not feed on plants at this stage, so it is difficult to detect.
Control methods: Thoroughly disinfect the cultivation medium and environment to eliminate the source of infection. Once thrips appear, apply an extraordinary comprehensive and thorough spray, all plants and the surrounding ground, iron frames, etc., should be sprayed.
The above explanation of the disease and pest control of Bletilla striata is hoping to bring a little help to your life!