How to prevent and control Cattleya pests and diseases? The Flower Clinic offers advice

Cattleya belongs to the Orchidaceae family, epiphytic orchids, native to tropical and subtropical America, with the most wild plants in Colombia and Brazil. Its flowers are colorful, large and fragrant, and it is known as the "king of tropical orchids." Colombia, Brazil, Costa Rica and other countries all use Cattleya as their national flower. Because ofpests and diseasesinfection, the growth of some organs of the orchid plant is hindered, causingorchidornamental value and economic value to decrease. Therefore, in the daily care of Cattleya, it is necessary to strengthenpests and diseasesprevention and treatment to reduce losses. Below is an introduction to the main pests and diseases of orchidflowers and their control methods. Diseases Anthracnose mainly infects the leaves of Cattleya. In the early stage of the disease, light-colored sunken spots appear on the leaves, and concentric circular small granules form at the diseased spots. Later the spots gradually enlarge into circles, and the color of the spots gradually deepens until dark brown; in severe cases the entire leaf turns black. It is mostly caused by poor ventilation and stuffiness, and excessive nitrogen fertilizer also easily causes infection by this pathogen. Control methods: Remove diseased leaves, and apply fungicide to the wounds. Strengthen ventilation, reduce humidity, increase phosphorus and potassium fertilizer, and enhance the disease resistance of the orchidflowers. Spray with 500 times dilution of carbendazim, chlorothalonil or thiophanate-methyl wettable powder, and thereafter spray once every 10-15 days. Flower blight mostly harms the flowers or inflorescences of Cattleya, and young shoots are also easily infected. The infected parts are sunken dark brown to black lesions, usually covered with white mycelium and small pink spores. Severe infection can cause the flowers to turn yellow and drop at the bud stage. This disease can also infect leaves, mostly showing small spots at wounded tissue. It is mostly caused by water accumulation in the flower sheath and high temperature and humidity. Control methods:CultivationDuring the process, note that environmental humidity should not be too high, especially when the nighttime temperature is relatively low. When watering during flower bud differentiation, be careful not to splash water into the flower sheath. When plants become diseased, cut off diseased flowers, and every 4-7 days spray and drench the soil with 500 times dilution of 80% mancozeb or 50% carbendazim wettable powder. Wilt disease mainly infects the rhizome, causing it to turn purple, and the vascular tissue to turn pink-purple; it can also spread to the pseudobulbs and roots. Because the vessels become blocked, the leaves turn gray and the plant wilts and dies. Control methods: Remove diseased plants and infected soil, and spray, soak or drench the soil with 500 times dilution of 50% captan or 50% carbendazim wettable powder. 0.5% formalin solution can also be used. Flower rot: In the early stage of infection, light brown, very small water-soaked spots appear on the tepals; then the spots enlarge and cause the entire flower to rot, but the disease is limited to the flowers, so it is also called flower spot disease or flower brown rot. This disease is easily contracted in environments with excessively high humidity, poor ventilation, and nighttime temperatures that are too high. Control methods: If a sudden temperature drop is found before flowering, immediately reduce indoor humidity, and spray 500 times dilution of 50% carbendazim or 1% lime sulfur mixture to prevent flower rot. Other fungicides can also be used, but do not useflower-damaging drugs such as captan.