Common diseases and pests in orchid cultivation cause headaches for countless orchid enthusiasts, especially newcomers who are often too embarrassed to ask for advice, ultimately leading to the death of their orchids. This article summarizes seven common orchid diseases and pests, along with their prevention and control methods. Orchid enthusiasts may wish to give these a try. If there are any inaccuracies, please feel free to point them out.

1. Eliminating termites, black ants, and earthworms: These are major enemies of bonsai and some potted plants. Fill a bucket with clean water and slowly submerge the affected bonsai or potted plant to the bottom (the water level should just cover the top of the pot). After half an hour, all the ants in the water will be removed; however, earthworms will take about an hour to emerge from the soil and enter the bucket. This method is effective in one go and leaves no plants untouched. Alternatively, peel garlic cloves, crush them into small pieces with a knife, and bury them at equal intervals in the soil. After two or three days, the ants and earthworms will escape, having no impact on the growth of the plants.

II. Eliminating Nematodes: Mix one part quicklime with 20 parts water, heat to dissolve, then add one part cigarette butts (5-10 cigarette butts), soak for 24 hours, filter, add another 40 parts water, and spray the potting soil or around the bottom of the pot to control nematodes. Eliminating Whiteflies and Other Pests: Boil 200g of Sichuan peppercorns in 10 times the amount of water to make a stock solution, then dilute with another 10 times the amount of water and spray. This can control whiteflies, scale insects, and other pests.

3. Drowning snails: Place beer in a shallow basin at the bottom of the potted plant; the snails will automatically crawl into the basin and drown. 4. Eradicating longhorn beetles: Sew several small cloth bags, put two camphor balls in each bag, and tie the bags tightly. Bury three small bags of camphor balls (about 10cm deep) around the roots of the plants damaged by longhorn beetles. The camphor balls will slowly dissolve in the moist soil, allowing the plant to absorb them gradually, and soon the longhorn beetles will disappear.

IV. Eliminating Aphids: Take 3 orange peels, soak them in warm water in a teacup, cover and let it steep for 24 hours. Spray the leaves and stems of the affected plant with the liquid once a day. The aphids should be killed in about a week. Alternatively, soak cigarette butts in water for 24 hours, then use a brush or paintbrush to apply the liquid to the aphids. You can also prepare a 1-2% solution of neutral laundry detergent and spray or apply it to the aphids. The detergent will block their spiracles, causing them to suffocate. Killing Scale Insects: Mix white wine and water in a 1:5 ratio and apply to the affected areas once a week for three or four consecutive weeks to kill the pests. This method can also control aphids, spider mites, and other pests.

V. Stem blight: Spraying with quicklime mixed with water to make a lime emulsion can prevent stem blight, anthracnose, soft rot, and other diseases. Gummosis: First, scrape off the sap flowing from the branches and trunks of the flowers and trees, then apply gentian violet to the scraped areas. Apply once every 10 days, for 2-3 consecutive times, to control the gumming.

6. Controlling black spot disease: Mix leek juice and water at a ratio of 1:60, filter, and spray the juice on the diseased plants 1-2 times a day. The disease can be controlled and cured within a week.

7. Control powdery mildew: Wipe the leaves of the affected plants with cotton soaked in alcohol 2-3 times to make the powdery mildew disappear.