Preventing black spots on orchid leaves
Main content introduction: Knowledge about orchids in the Flower Clinic, preventing black spots on orchid leaves, detailed introduction as follows:
Preventing black spots on orchid leaves requires delicate care. Negligence can lead to black spots on the leaves. For example, watering from above can cause soil to splash onto the leaves, leading to leaf burn. Fertilizer liquid that gets on the leaves, if not immediately rinsed off with water, can cause black spots and leaf burn. During spring and summer, failure to provide shade can cause the orchid leaves to turn yellow and burn under the intense sun. Placing orchids in environments with a lot of soot can cause black spots due to smoke damage. Additionally, orchids can be affected by (T-J) disease, which often causes black spots on the leaves.
The (T-J) disease is particularly prone to occur during the plum rain season or continuous rainy autumn season when temperatures are high and ventilation is poor, and it can sometimes be quite severe. The symptoms start with semicircular or circular brown spots on the leaves, which gradually develop into blackish-brown spots. Many of these spots expand into streaks of blackish-brown. In the later stage, the center of the spots turns grayish-white with many small black dots. This disease is commonly seen in the middle and upper parts of the leaves. When this disease is detected, the affected leaves should be cut off. Initially, apart from improving ventilation, you can spray a 50% carbendazim wettable powder solution at 500 times dilution or a wettable thiophanate-methyl powder solution at 500 times dilution, once a week for 3 to 4 consecutive weeks, which can yield good results. To prevent pest and disease infections, orchids should not be too close or dense to each other, avoiding cross-contamination of leaves, and a well-ventilated and well-lit environment should be maintained.
This article shares all the content about preventing black spots on orchid leaves, and green plant enthusiasts may refer to this for reference.