What to Do When Crops Develop Black Spot? A Detailed Guide to Prevention and Control Methods

Rare and preciousOrchidsWhen they get black spot, it really ruins the look. You can't bear to cut it off, and you can't bear to leave it, and it just feels awful. Once, a fellow orchid grower shared their experience, saying that touching the spot with a red-hot iron tool would cure it. I followed the same method, and the results were indeed quite good. The area burned by the iron tool lost its green color and turned white, but a whole leaf was saved, with little effect on its appearance. If the black spot is at the leaf tip or leaf edge, after burning, it is hardly noticeable unless you look closely. If the black spot is in the middle of the leaf, you can use a magnifying glass to focus sunlight and burn it. Whether using an iron tool or a magnifying glass, you must control the temperature. If the temperature is too high, it is easy to scorch or burn through, affecting the appearance; if the temperature is too low, the bacteria will not die. Only the optimal temperature achieves the best result. This method is suitable for retired orchid growers who grow for leisure, with only a small number of fine specimens, who have time to detect disease spots early, so the burned area is small and the result is satisfactory. (Lao Tie)