The Great Cicada Buzz: Protecting Your Trees from Nature's Symphony and Scars

As the ground thaws and spring unfurls its vibrant tapestry, another, more ancient rhythm prepares to emerge: the loud, insistent song of the cicadas. While these insects are a fascinating natural phenomenon, their emergence, particularly of large broods, can pose a significant challenge to the health and aesthetics of your garden, especially to young trees.

Understanding their lifecycle and the specific damage they inflict is the first step in protecting your green sanctuary.

Cicadas cause damage primarily during their egg-laying phase, known as oviposition. Female cicadas use a sharp, saw-like organ called an ovipositor to cut slits into the tender branches of deciduous trees and shrubs, where they deposit their eggs.

These slits, often appearing in rows, can weaken branches, cause them to wilt (a phenomenon called 'flagging'), and in severe cases, lead to branch dieback. While mature, established trees can typically withstand this assault with minimal long-term effects, young trees (those under four years old or with slender branches) are particularly vulnerable.

The wounds created provide entry points for diseases and can stunt growth, leaving lasting scars.

Preparing your garden before the cicada emergence is key to minimizing damage. One of the most effective preventative measures for young or vulnerable trees is physical exclusion. Covering smaller trees and shrubs with fine netting (mesh size 1/4 inch or smaller) before the cicadas begin to emerge can create a protective barrier.

Ensure the netting is securely fastened at the base, preventing the insects from crawling underneath. For those planning new plantings, consider delaying the installation of young, vulnerable trees until after the cicada emergence period has passed, typically a few weeks to a month. Avoid pruning trees just before an emergence, as fresh cuts can attract insects.

After the cicadas have departed and their eggs have hatched, it's time for post-emergence care.

Inspect your trees for signs of oviposition damage, particularly 'flagging' – where branch tips turn brown and die. Prune out these damaged branches promptly to prevent secondary infections and encourage healthy new growth. Make clean cuts just below the damaged section. It's crucial to avoid using broad-spectrum insecticides as a primary defense against cicadas.

These chemicals can harm beneficial insects, birds, and other wildlife, and are generally ineffective against the sheer numbers of emerging cicadas. Focus instead on proactive physical protection and attentive aftercare.

While cicada damage can be alarming, it's important to remember that it's a temporary event in the long life of a tree.

Most trees, especially mature ones, will recover naturally. With a little preparation and diligent post-emergence care, your garden can weather the storm of cicada season and continue to thrive, showcasing nature's resilience and your dedicated stewardship.