How to prevent and control anthracnose in lucky bamboo
Symptoms
In the early stage of the disease, grayish-brown lesions appear at the leaf tip or leaf margin. The lesions are irregular or semicircular, grayish-white in the center, dark brown at the edges, with a yellow halo outside; the concentric rings on the lesions are obvious or not obvious, and small black dots are scattered on them.
Control methods
In winter and spring, remove diseased leaves promptly and destroy them, and spread quicklime to disinfect the soil.
Improve ventilation, control water appropriately, reduce the humidity of the potting soil, and apply organic fertilizer appropriately.
Clear away diseased residues and burn them in a centralized manner, and spread quicklime once to sterilize and disinfect the soil.
Spray fungicide promptly to control the disease. Spray chlorothalonil, 3~4 times in succession, with an interval of 10 days.
How to prevent and control anthracnose in lucky bamboo? Control methods for lucky bamboo anthracnose
Lucky bamboo anthracnose is extremely harmful to the growth of lucky bamboo, and in severe cases it can even endanger its survival. But do not worry. Next, the editor will introduce in detail the control methods for lucky bamboo anthracnose to help everyone grow lucky bamboo better.
Control methods for lucky bamboo anthracnose:
1. Care and management
When symptoms of anthracnose appear in lucky bamboo, be sure to promptly prune diseased and withered leaves, and be sure to take them out of the field and burn them. This can effectively reduce the occurrence of bacteria and eliminate pathogens. Then spray fungicide over the whole plantation to effectively eliminate sources of infection in the lucky bamboo plantation.
2. Drain water promptly after rain
For field-grown lucky bamboo, be sure to drain water promptly after rainy days to reduce humidity in the plantation. When fertilizing, be sure not to apply excessive nitrogen fertilizer. Spray foliar fertilizer promptly to promote better growth of lucky bamboo and also enhance its disease resistance.
3. Pest and disease control
The main pests of lucky bamboo are spiders, longhorn beetles, spider mites, scale insects and other diseases, so these pests must be controlled promptly, which can, to a certain extent, prevent and control the occurrence of lucky bamboo anthracnose.
4. Indoor cultivation
Many people now grow lucky bamboo at home, so be sure to pay attention to ventilation and light transmission, cooling and dehumidifying, which can effectively avoid the breeding of pathogens.
The above are the control methods for lucky bamboo anthracnose summarized by the editor. I hope everyone can grow lucky bamboo well.
Occurrence and control of lucky bamboo anthracnose
Lucky bamboo (scientific name: Dracaena sanderiana Sander) is a perennial evergreen small tree foliage plant of the Agavaceae family and the genus Dracaena. The plant is slender, upright, with branches on the upper part. The rhizome is horizontal, nodular; the stem is thick and upright, and the plant form is delicate. The leaves are alternate or nearly opposite, long lanceolate, with obvious main veins, and the leaves are dark green. The umbel inflorescence has 3~10 flowers borne in the leaf axils or opposite the upper leaves, and the corolla is bell-shaped and purple. The berry is nearly spherical and black.
Lucky bamboo is native to the Canary Islands and the tropical regions of Africa and Asia, and was introduced to China in large quantities since the late 1980s. It is generally mostly used for household vase insertion or potted care, especially the “tower-shaped” form spread from Taiwan, China, also known as “fortune bamboo”, with high ornamental value. China has the congratulatory phrase “flowers bloom in wealth, bamboo reports peace”. Because lucky bamboo has slender stems and leaves, is soft and elegant, and is full of bamboo charm, it is very popular among people.
Occurrence and control of lucky bamboo anthracnose
Lucky bamboo anthracnose is a common disease and occurs relatively widely. It is a serious disease harming lucky bamboo in the south. Because the temperature was high last winter and this spring and the drought lasted a long time, early-planted lucky bamboo in Zhanjiang, Guangzhou, Taishan and other areas of Guangdong has already grown luxuriantly. According to many flower growers, many lucky bamboo leaf tips to leaf blades have become dry and withered and continuously spread and expanded to the upper leaves; because of the long period of drought and high temperature, the disease broke out when rain occurred. Diagnosis confirmed that it was an epidemic of lucky bamboo anthracnose, and it occurred in an epidemic ahead of time in mid-March.
II. Symptoms
The disease initially mostly occurs on leaf tips or leaf margins and leaf blades. In the early stage, the diseased part shows water-soaked dark green irregular lesions and gradually spreads and expands to the upper leaves; in the middle stage, they are semicircular to indefinite in shape, with dark brown edges and obvious boundaries; in the later stage, the outer edge of the leaf lesions has a yellow halo, and the center of the lesions is grayish-brown or grayish-white to yellowish-brown. The concentric rings on the lesion surface are obvious or not obvious, and small black dots appear on the lesions. The leaves begin to gradually turn yellow and die. Once the lesions spread and expand to the leaves, tender leaf buds, main stem, and base of leaf stems, when the disease is severe, the stems and leaves will rapidly wilt and die. Under weather conditions of continuous rain and abundant fog and dew, the diseased leaves spread, the plants grow poorly, and the effect of foliage viewing is seriously affected.
III. Pathogen and occurrence pattern
The pathogen is Colletotrichum fungus of the Deuteromycotina. The pathogen survives the winter as mycelium and acervuli on diseased leaves and diseased residues. When the temperature rises in spring of the following year, the acervuli produce conidia, which spread and diffuse by wind, rain, fog and dew, and the pathogen invades through stomata and wounds. During the growing period, it can cause repeated infections many times. Higher temperature and humid weather conditions favor the disease. The disease can occur from mid-March to October every year. The optimum temperature for pathogen germination is 22—28℃. In the south, the disease is most severe from May to June. In summer, with more rainy weather and high soil moisture, the disease develops quickly. Secondly, it is also relatively severe in summer and autumn. Generally, the originally diseased leaves become diseased first. In household potted lucky bamboo in the south, it can also occur year-round. Generally, in field cultivation, spiders and other pests damage the leaf heart or bite the leaf tips and then spread and invade, and it can also survive and spread in diseased residues in the soil. The disease is severe under conditions of overly sticky soil, poor aeration, poor drainage, no ventilation or light transmission, overly dense plants, and high temperature and high humidity; it is also favored under conditions such as extensive management or weak growth due to drought and lack of fertilizer.
IV. Control methods
1. Strengthen the care and management of lucky bamboo. It should not be planted too densely; pay attention to avoiding freezing injury and frost injury; use moist irrigation, apply fertilizer reasonably, and increase the application of phosphorus and potassium fertilizer to promote growth and improve disease resistance.
2. In winter and spring, prune diseased leaves and clear away withered leaves, and burn them in a centralized manner to reduce disease occurrence, and spread quicklime once to sterilize and disinfect the soil; or spray 50% compound carbendazim 500 times solution once to prevent the disease, with a relatively good preventive effect.
3. Improve the permeability of the field or garden. For field cultivation, pay attention to digging ditches after rain to drain accumulated water, reduce field humidity, and do not apply excessive nitrogen fertilizer. During the growing period, set up shade nets to reduce exposure to high temperature and strong light. Promptly kill spiders, longhorn beetles, spider mites, scale insects and so on to reduce transmission vectors.
4. When diseased plants are found, spray fungicide promptly to control the disease. In the early stage of the disease, alternately spray 75% chlorothalonil + 70% thiophanate-methyl wettable powder (1:1) 600—800 times solution, or 50% compound thiophanate 800 times solution, or 50% Kasugamycin wettable powder 600—800 times solution, or 12·5% emulsifiable concentrate Jiaobantuo 1000—1500 times solution, 25% Tanteling wettable powder 500 times solution, or 50% anthracnose Fumei wettable powder 500 times solution, 50% Shibaogong wettable powder 1000 times solution, or 75% chlorothalonil + 70% Daigaole (1:1) 1000—1200 times solution, with good control effects. The above agents should be used alternately, once every 7 days, for 3—4 consecutive sprays. Generally, spraying promptly before or after heavy rain can control the pathogen from producing spores and conidia from spreading and infecting, with relatively good control effects.