Today in my garden, I noticed something strange on a tree. I clearly remember that just a few days ago, nothing like that was there.

I walked closer to take a better look and realized they were moving—slowly, almost imperceptibly, but definitely moving.

I searched online for answers, and what I discovered shocked me. I want to share this so you can be careful if you ever see something like it in your own garden.

Earlier today, on that same tree in my garden, I spotted some strange gray clumps that looked dirty. They definitely weren’t there a few days ago. As I got closer, I was horrified to see them moving. My heart skipped a beat—and then I felt an even deeper dread when I learned they were egg masses of the spotted lanternfly, a dangerous invasive insect.

These pests feed on the sap of plants and can destroy dozens of species of trees, shrubs, and vines. They weaken plants, cause them to wilt, and leave behind sticky secretions that quickly attract sooty mold. As a result, fruits become damaged, harvests decline, and young trees can die.

To get rid of spotted lanternflies, you need to locate and remove the egg masses by scraping them into soapy water or alcohol. In spring and summer, you must destroy the nymphs and adults—either mechanically or with safe insecticides. If possible, remove their favorite host trees, such as the tree of heaven (Ailanthus altissima).

The sooner you start fighting them, the greater your chances of saving your garden.