Pest and Disease Prevention and Control Methods for Growing Orchids on a Balcony

Orchidssuffering frompests and diseasesis mainly caused by poor ventilation, insufficient light, poor drainage, excessive humidity and infection by external pathogens. Therefore, fororchids'spests and diseasesprevention must be the priority, with prevention weighing more than cure. First, pay attention to ventilation, lighting and drainage to create a good environment; second, cultivate robust orchid seedlings to enhance their own resistance to disease; third, strictly carry out quarantine and disinfection to prevent the spread of external pathogens and pests, and thereafter spray pesticides regularly to eliminate pests and diseases before damage occurs. Orchidpests most commonly include scale insects, which can be removed by manual brushing, or treated with 40% omethoate, or 50% malathion at 800-1000 times dilution, or by applying 5% carbofuran or methamidophos around the potting soil, all of which give good control results. Common diseases include anthracnose, also known as black spot, which mostly occurs during the plum rain season, with dark brown spots appearing on the orchid leaves and, in severe cases, causing the whole orchid plant to die. It can be controlled by spraying 50% carbendazim or 70% thiophanate-methyl at 800 times dilution, once every 10 to 15 days, for 2 to 3 consecutive times. Southern blight, also known as mold disease, produces white fungal threads on the soil surface and at the base of the orchid stems, causing the stems and roots to rot; the soil must be disinfected, diseased plants burned, and Bordeaux mixture or quintozene at 500 times dilution sprayed or drenched. Brown rot is a bacterial disease that develops extremely quickly, causing the whole plant or pseudobulbs tosoft rot; diseased plants should be cut away promptly, and 1500-2000 times dilution of cyazofamid, or 70% thiophanate at 600-800 times dilution, or 0.5% Bordeaux mixture sprayed 2-3 times to achieve control. Some pesticides have a combined effect against multiple pathogens and viruses, but the dosage must be accurately controlled and the instructions followed. Too small a dose will fail to achieve control, while too large a dose will cause phytotoxicity and kill the orchid plants. Moreover, all pesticides are toxic, so when applying them on a balcony, special attention must be paid to the safety of people and animals and to preventing environmental pollution. Balconyorchid growingalso requires attention to ventilation and temperature regulation. Ventilation provides fresh air for orchids and promotes metabolism. Therefore, open windows more often to allow air convection, which helps regulate temperature and humidity. But at the same time, guard against the hot winds of summer, the dry winds of autumn and the cold winds of winter. Temperature regulation mainly means preventing heat in summer and cold in winter. For heat prevention, pay attention to shading and prevent direct scorching sun. For cold prevention, set up a greenhouse to prevent frost damage, creating a good environment for orchids so they grow vigorously. (Shou Jicheng, Zhejiang)