Here’s a brief look at how each of these potential causes can harm your plants: 1. If the stem has any black/blue spots that is a sign of rot. There is no control for infected plants. Overwatering. They can store water for surviving in extreme weather conditions. Black Spots on Monstera due to Under Watering. However, chances are you’ll be able to save your plants if you catch the disease at its early stage. The first signs of fungi infestation are yellow spots on older leaves. On the other hand, black spots on Monstera can also be caused by under watering. Spots later enlarge, but remain separated. Identification to get black spots on succulents. If the roots look healthy pot it up again in dry well draining soil and ease off the watering for a while. Easy to get and hard to eradicate, blight can quickly ruin one plant or a whole garden full. Black spots on succulents are caused by over watering, sunburn, viruses, frost, trauma and pest infestation. Look carefully at the black spots on your succulents. Black spots on succulents are one of the most common diseases among these plants. Watching plants slowly wilt and die after their stems turn black leads to frustration and anger. Cut your succulent stem above the rot and leave the cutting to callous over for a week. Cacti are relatively problem-free plants, often only suffering from a few sap-feeding insects. Blight is the all-purpose name for a number of fungi in the soil that affects plants in this way. You can see that the stems … For the most part, black spots are due to fungi. Dry Rot (fungi – Phyllosticta concava and Mycosphaerella spp. ): Small black circular spots develop first, which later increase in size until they reach a diameter of one or two inches. Then, the spots tend to spread and get into the center portion of the florets. ... You see, the leaves, stems, and roots of succulents have a special ability. Causes of Black Spots on Broccoli Stems. Black spots on Monstera due to over watering Black spots on Monstera 2. Examine the stem for any black/blue spots. If you see small, brown bumps on your succulent, then you may have a scale problem. The diseases can spread out from dry regions. Don’t plant succulents in a humid and warm area. The most common reason for brown or dark spots on the leaves leaves on your succulents is sun damage or sunburn. Cruciferous vegetables such as broccoli can be susceptible to fungi caused by wind and moisture. If you notice the leaves are turning light brown and looking “crispy”, your plant probably needs a drink. This can happen if the plant is exposed to unfiltered full sun or if the plant is recently moved to a sunny location without acclimatizing the plant first. Here’s a Donkey’s Tail succulent, in which the middle plant has been severely over-watered, and has completely rotted as a result. 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