Catalan blight control methods
Cartland, known as the "Queen of Orchids," has captured the hearts of countless gardening enthusiasts with its gorgeous flowers. However, during the maintenance process, this delicate tropical orchid is extremely vulnerable to blight, causing the carefully cultivated flowers to wither before they bloom. This article will systematically analyze the prevention and control system of Catlan blight to help you protect this precious beauty. The typical symptoms of Catland blight show that needle pin-like dark brown spots appear at the base of the flower buds at the beginning of the disease, and rapidly expand into necrotic patches with a diameter of 2- 3 cm within 3-5 days. Spider-like pink hyphae can be seen on the surface of the lesion, which is a typical feature of Fusarium pathogens. After infection, the tender shoots showed a "circular constriction" phenomenon, which eventually led to the collapse and death of the entire seedling. Pathological development The pathogenic bacteria spread rapidly through vascular bundles, and the transformation from local infection to systemic infection can be completed within 48 hours. When the night temperature is below 15 ° C, the plant's disease resistance drops by 50%. Improper watering at this time will accelerate the reproduction of the bacteria. Recent research has found that the infection rate of wounds is 78% higher than that of intact tissue, and disinfection of trimming tools is crucial. The environmental control strategy of the Catlan Comprehensive Prevention and Control Plan maintains the temperature difference between day and night between 8 and 10℃, and the temperature at night is no lower than 18℃. A bottom siphon water supply system is used, and the air humidity is controlled at 65%-75%. Installing two 12W UVB fill light per square meter and irradiating for 4 hours a day can significantly enhance plant resistance. Chemical control measures were used alternately in the early stage of the disease, 80% mancozeb (500 times solution) and 25% azoxystrobin (1500 times solution) were used, focusing on spraying leaf axils and substrate surfaces. It is recommended to add 0.1% silicone additive, which can increase the adhesion rate of liquid medicine by 40%. Soil irrigation uses a compound preparation of hymoxazole + metalaxyl, and the preventive effect reaches 92% once a month. Biological control technology mixes 5% Trichoderma bio-organic fertilizer into plant materials to continuously inhibit soil-borne pathogens. Yellow sticky insect boards were hung to monitor disease-transmitting insects such as thrips, and 2 ladybugs were placed on each plant for biological control. Studies have shown that weekly spraying of seaweed extract can increase the chitinase activity of plants by three times.
By establishing a precise temperature-humidity-light control system, combined with the synergistic effect of chemical control and biological control, the incidence of Catlan blight can be reduced to less than 5%. It is recommended to conduct foliar microscopic examination every month and use a portable plant health monitor to monitor the condition of vascular bundles, so that technology can protect the conservation of orchids.