Succulent plants sunburned for a few days and then developed black rot? Teach you to control water and improve ventilation to restore health

A flower enthusiast asked why succulent plants developed black rot and turned to mush after just a few days in the sun, because this spring, the maximum temperature already reached 30°C for two consecutive days, while the same period last year was 20°C, and hitting 30°C was something that only happened after May. During the acclimation period, putting them directly outdoors with too strong light makes it very easy for pathogens to invade and infect. And considering that some people may not have trimmed and dried the roots before planting, problems are just a matter of probability.

It is true that succulents are light-loving plants, but during the acclimation period, as long as they do not become leggy and do not lose color, the less light the better. Once the temperature reaches 30°C, a ventilated, bright place without direct light is the foundation for succulents to acclimate and survive. Besides newly purchased succulents needing acclimation after planting, those originally grown indoors that are moved outside during this period also need acclimation. You cannot suddenly give them full sun. At this time the plants are quite tender; full sun at best causes sunburn, at worst sun-blackening, turning to mush, and discoloration.

Regarding the prevention and treatment of black rot: when transplanting, please soak the roots with carbendazim. Succulents in the potting-on period have very weak resistance. At this time, if there is Fusarium oxysporum in the soil, they are very prone to disease, and carbendazim can treat it. If you notice early that a succulent is not right, drenching the roots with carbendazim is also very effective, and the earlier the better. If part of a succulent is found to have black rot, the earlier it is cut away the better. Once necrotic, it cannot recover. Do not hope that it can still recover. Not only will it not recover, but the necrotic part will also become a culture medium for fungi, breeding large amounts of fungi.

Pay attention to pot soil breathability and heat dissipation. This is a common saying. Stuff, hot pot soil not only creates breeding conditions for Fusarium oxysporum, but also lowers the resistance of the root system, especially when watering is followed by strong sun exposure, when the root temperature in the soil becomes very high. Pot soil that is too wet, light that is too strong, and temperatures that are too high can also easily cause some Sedum succulents to drop leaves and turn to mush, especially garden soil and sandy soil, which have too strong water retention and are not breathable. Attention should be paid to controlling water and improving ventilation.

The symptoms of black rot in succulent plants start from the middle of the succulent stem. Some people treat black spots and watery rot on succulent leaves as black rot, and believe that black rot can be treated, which is unscientific. This is usually not black rot, but black spot disease. In fact, even without medicinal treatment for black spot disease, stopping watering and making its growing environment dry can also stop its spread. The symptoms of black rot damaging leaves should be as described below: leaves fall off at a touch, and blackening and rot begin from the leaf growth point, that is, the place where leaf cuttings sprout, and spread to the leaf.

For plants that have begun to turn to mush, the mushy leaves should be removed and discarded immediately, and then ventilation should be increased vigorously. For plants whose branches or stems have already turned to mush and developed black rot, behead them immediately. When handling rotting plants, be sure to keep tools clean and sterile, and be sure to wash your hands carefully before touching other plants. Use a sharp knife to cut away the infected part, removing as much as possible, then dust the wound with a fungicide. Finally, place it in a shady, ventilated place to let the wound dry naturally. If conditions allow, you can also use a small fan to blow air on it.

This is a gathering place for succulent plant enthusiasts, sharing succulent care tips. Welcome to follow and exchange ideas.