Spotted lanternflies are not dangerous to humans. They do not bite, sting, or transmit diseases to people or pets. Their mouthparts are designed only to feed on plant sap, not to harm humans. However, they can be harmful to plants, crops, and trees by feeding on their sap and producing sticky honeydew that encourages fungal growth, which indirectly affects human activities such as agriculture and forestry. Their presence can also be a nuisance due to the sticky residue and congregating behavior around homes and outdoor spaces.