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Without enough calcium, the plant is unable to produce strong cell walls, which leads to the stem turning black. This is a common problem that is caused by a lack of calcium in the soil. You’ll then want to use a rubber plant-safe fungicide treatment on the roots, before leaving your plant to air out of the pot for a whole day. In the early stages, brown lesions appear on the plant roots then increase in size and turn black. If you notice your tomato plant ‘s stem turning black, it is likely due to a condition called blossom-end rot. The different causes may be Alternaria stem canker, bacterial canker, early blight, and late blight.

Snip off the roots that have become mushy, and allow other weak roots to fall off themselves. The tomato stems may turn black due to an attack by fungus. This means that the roots are not able to breathe and therefore literally begin rotting away.īut don’t panic – you can save your plant from root rot! Trim off the damaged leaves, remove the plant from its pot, and dispose of the existing soil. This severe level of overwatering means that the soil has become oversaturated because it hasn’t been able to drain properly. Black spots are often accompanied by wilting leaves, slow growth and mushy roots if this is the case. More often than not, though, it will be due to overwatering that has led to root rot. Rubber plants aren’t typically afflicted with diseases or bothered by pests, but it can happen! Black spots may be due to mould, bacterial infections, fungi or even viral diseases. The fungus Alternaria solani is the most common cause of early blight. Spores are released all year except winter but the majority of infection occurs in early summer. Fungal spores are produced just under the surface of the stem which spread to neighboring plants. This is usually in the early to mid-spring. The stem will turn nearly black over time. The name comes from the fact that early blight appears early in the growing season. If your leaves are turning black, it could be due to a number of reasons. The term blight refers to a group of fungal infections that cause plant stems to turn black. Why are my rubber plant leaves turning black?