There could be several reasons why your jade plant has black spots. One possible cause is an insect infestation. Some common bugs that can cause black spotting on jade plants include aphids and spider mites.
Aphids are small, soft-bodied insects that feed on the sap of plants. They can be found on the undersides of leaves and stems. When aphids feed on a jade plant, they pierce the plant tissue and suck out the sap. This feeding can cause the plant to develop black spots where the aphids have been feeding. These spots are often sticky and can attract other insects or mold.
Spider mites are another common pest that can cause black spotting on jade plants. These tiny insects are not actually spiders, but they are members of the arachnid family. Spider mites feed on the plant’s sap by piercing the plant tissue and sucking out the juices. As they feed, they can cause damage to the plant’s cells, leading to black spots on the leaves. These spots may appear dusty or speckled and can spread if the infestation is not controlled.
In addition to insect infestations, black spots on jade plants can also be caused by other factors such as fungal or bacterial infections, overwatering, or physical damage. Fungal or bacterial infections can occur if the plant is kept in a humid environment or if the leaves are frequently wet. Overwatering can lead to root rot, which can cause black spots on the leaves. Physical damage, such as bruising or cuts, can also result in black spots.
To determine the cause of the black spots on your jade plant, it is important to closely inspect the leaves and stems for any signs of insects or other damage. Look for tiny bugs, webbing, or sticky residue on the plant. You can also gently wipe the leaves with a damp cloth to see if any black spots come off. If you suspect an insect infestation, you can try using insecticidal soap or neem oil to control the pests. However, be sure to follow the instructions carefully and test any treatment on a small area of the plant first to avoid causing further damage.
Black spots on a jade plant can be caused by insect infestations such as aphids or spider mites. Other factors such as fungal or bacterial infections, overwatering, or physical damage can also contribute to the development of black spots. It is important to closely inspect the plant and take appropriate measures to control the pests or address any other underlying issues to promote the health and vitality of your jade plant.