Example of preventing and treating black rot in Sedum
For most women, knowledge about the Sedum plant 'Jingye' and its black rot prevention and treatment examples, let's take a look together.
Summer has arrived, and the common black rot in the Crassulaceae family has begun to break out unexpectedly. I will slowly explain using the example of black rot in my 'Jingye' plant. It will be more intuitive to read the text while looking at the photos. I hope this can be helpful to新手 Sedum enthusiasts and that we can all learn together!
On April 2, 2014, because it couldn't grow well in a crowded pot, I dug it out and planted it alone in a flower pot. The pot was very beautiful, but the bottom hole was too small. I hesitated whether to use it, but later I comforted myself by saying that with more granular soil for better aeration and less watering, it would be fine. That was the beginning of its nightmare.
On April 17, 2014, I found in the morning that two leaves at the bottom had become watery. I got nervous immediately. It had been raining and overcast for several days, and it was placed by the window, getting some rain. Could it be that the pot was not breathable and the bottom leaves were too dense and thick, causing them to become stuffy? I decisively pulled off all the bottom leaves. These are the watery leaves, which have become transparent, and the leaf epidermis is very thin, easily crushing with water.
When I dug it out, the part of the leaves that had become watery was slightly yellow, and the side buds began to grow their own roots. This might be because this part of the stem could no longer provide sufficient nutrients to the side buds, so they rooted themselves to be self-sufficient.
Looking at the other side, the stem was still good, but the side buds had also grown their own roots. I planted it in another pot and observed it with dry soil.
On April 18, 2014, after a day, the part of the stem where the leaves had become watery had started to turn black, especially noticeable at the base of the small side buds, which is where the roots grew.
On April 19, 2014, I cut the top off. The stem cross-section had different colors, with the lower part already black and still attached to a broken, watery leaf. This is black rot.
Black rot commonly occurs in the crown and stem of the plant, causing internal rotting, blackening of the stem, leading to watery leaves and the plant falling over.
The causes of the disease are excessive watering or high humidity in the cultivation environment, and poor aeration of the potting soil leading to fungal infection. The fungus refers to Fusarium sp. If the disease is not treated in time, it will spread rapidly. Fusarium often causes various symptoms such as root rot, stem rot, stem base rot, and flower rot. The optimal temperature for disease occurrence is between 27°C and 32°C. At 20°C, the disease tends to be moderate, and below 15°C, it no longer occurs. This is why black rot often occurs in summer.
Looking from the side, one side is black while the other is still good. This reminds everyone not to have a侥幸心理, thinking that the other side is still good and there's no problem. Black rot spreads quickly, and a moment of negligence can lead to the death of the entire plant.
Treatment methods:
1. Cut the top, remove the rotting part, making sure there is none left, until the stem shows a normal color, then place it in a shady and well-ventilated area to dry the wound. The cut-off top can be used for cutting, and the leaves can be used for leaf cuttings. This seems to be pushing me to become a big grower!
2. Use carbendazim, of course, other fungicides can also be used. I mainly use carbendazim. After cutting the top, the plant can be disinfected with carbendazim. Before cutting, disinfect the potting soil with carbendazim first, then plant, preferably with dry soil to root. The usage of carbendazim is explained on its packaging, so I won't elaborate here.
This is the cut-off top, and with the small one, there are a total of six. Am I really going to become a big grower?
These are the leaves that were pulled off. It seems I am indeed on the rhythm of becoming a big grower. One thing to note is that the leaves pulled off due to black rot still have a certain chance of becoming watery, so don't put them on the soil for leaf cuttings right away. Let them dry for a few days until no more watery leaves appear before leaf cuttings, otherwise, it can easily cause infection in the potting soil.
From cutting the top on April 19 to rooting on May 8, in less than a month, it came back to life. It's really happy. Sedum is like this: strong but also fragile. The key is still the care environment and soil mix. A little dry is fine. I haven't heard of anyone's Sedum dying from drought, but rather from excessive watering, poor soil mix, and pot drainage, leading to black rot. So everyone must pay attention, especially in rainy and humid weather. It's best not to let plants like 'Jingye' get rained on to avoid problems.
Later, you can proceed with normal maintenance. In summer, avoid direct sunlight and give it some shade. Here I must mention that before summer, be sure to spray your Sedum with fungicide, and I always use carbendazim. This can provide advance protection and prevent the outbreak of Fusarium.
The above comprehensive explanation of the methods for preventing and treating black rot in 'Jingye' is hoping to solve your problems with green plants.