The reasons for the black rot in succulents
Are you curious about the knowledge topics in the flower clinic, such as the reasons for the black rot in succulents? Let's learn about it together.
Summer is the high-incidence period for black rot in succulents. Many succulent enthusiasts hope to understand the causes of black rot in succulents. Black rot is caused by the fungus "Fusarium oxysporum," professionally known as Fusarium wilt, with the pathogen being Fusarium oxysporum, belonging to the Deuteromycetes. It specifically causes vascular bundle diseases in ornamental plants, with main symptoms including root rot, stem rot, stem base rot, and flower rot.
The above information may be a bit difficult for some enthusiasts to understand. Let's look at a more popular explanation:
1. The resistance of the succulent plant itself decreases
Like humans, healthy, strong, and robust individuals are less likely to get sick. When immunity decreases, it is easier to contract various viruses and fungi. To prevent black rot in succulents, you need to keep your plants healthy and strong. Regarding how to keep the plants healthy, I recommend one thing: in summer, you must shade, ventilate, and control watering, and avoid fertilizing.
2. A large number of fungal cells reproduce and invade the succulent
Fungal cells reproduce in a humid environment using spores, not the simple binary fission method of bacteria. A single cell can produce thousands of spores. Therefore, in a good temperature and humidity environment overnight, fungi can reproduce thousands of offspring, creating a numerical advantage for invading the succulents.
If your succulents happen to have a decreased resistance, and there are parasites biting them, causing wounds, it creates an opportunity for Fusarium oxysporum to invade. Thus, black rot becomes inevitable. Therefore, in summer, avoid getting rained on, keep the pot either dry and hot or moist and cool, and do not give fungi a chance to reproduce.
Let's普及 some reasons why summer is the high-incidence period for black rot in succulents:
Because Fusarium oxysporum is a fungus, and in summer, with warm and humid conditions, excessive watering creates a moist and stuffy environment, which easily meets the reproduction requirements. In the literature on controlling cotton wilt, it is described that the optimal temperature for Fusarium wilt to occur is between 27°C and 32°C, the disease tends to be moderate at 20°C, and it does not occur below 15°C. Based on this temperature condition, wilt disease commonly occurs from April to June in the South China region, and from May to August in Sichuan, Yunnan, and the East China region. Therefore, please pay more attention to the occurrence of black rot in summer.
Finally, let's talk about some common methods to prevent and treat black rot in succulents:
1. Pay attention to the potting soil's ventilation and heat dissipation. The hot and stuffy potting soil not only creates a breeding condition for Fusarium oxysporum but also reduces the resistance of the roots, especially after watering and exposure to strong sunlight, which causes the root temperature to soar.
2. When transplanting, soak the roots in carbendazim. The resistance of the succulents during the potting period is very weak. If there is Fusarium oxysporum in the soil, it is easy to get sick. Using carbendazim can treat it. Early detection of abnormal succulents with carbendazim root irrigation is also very effective, the earlier the better. When some parts of the succulents show black rot, the earlier the removal, the better. The necrotic part will become a culture medium for fungi, reproducing a large number of fungi.
PS: Before and after cutting, wash your hands and disinfect. The knife and scissors should also be disinfected to prevent transmission!
3. Prevent insect bites and prevent injuries.
4. Irrigate the pot with carbendazim, using a 500 to 600 times solution of carbendazim before planting and cutting the seedlings to effectively inhibit (spores are difficult to completely remove, so it is inhibition) the harm of Fusarium wilt.
5. Lower the temperature and place the unhealthy ones in an air-conditioned room.
The above explanations about the reasons for black rot in succulents hope to bring a little help to your life!