Do Dog Day Cicadas Damage Trees And Shrubs

Dog day cicadas raise questions for homeowners because their summer appearance coincides with often high temperatures and busy garden seasons. This article explores what these insects are and whether they cause damage to trees and shrubs. The goal is to provide clear guidance rooted in observation and practical experience.

What Are Dog Day Cicadas and When Do They Appear

Dog day cicadas are a group of large singing insects that emerge in midsummer during hot and humid periods. They produce a loud chorus that can fill neighborhoods on warm days and nights. These insects are regular guests in many temperate landscapes and do not operate on a strict yearly schedule in the way that periodical cicadas do.

Adults emerge from ground resting stages and seek out trees and shrubs to feed on sap and to mate. The timing is influenced by heat and soil conditions, and the duration of the above ground activity is typically short. Home gardeners often notice that the ground becomes noisy as the adults begin their aerial performances.

Do They Damage Trees And Shrubs

Cicadas feed primarily on plant sap using specialized mouthparts. They extract sap from twigs and branches as they go about their adult lives. The amount of sap removed by a population on established trees is usually not enough to cause serious harm to healthy specimens.

Damage that is observed is often cosmetic rather than structural. Some branches may appear with slight cracking or splitting as females insert their ovipositors to lay eggs. This activity can result in minor branch damage, but it is rarely enough to threaten mature trees or large shrubs.

Types of Injury Cicadas Cause To Trees And Shrubs

Egg laying by female cicadas involves cutting into slender branches with ovipositors. This oviposition can lead to a pattern described as flagging, in which leaves and small branches die back along the tips. The injury is typically limited to small diameter limbs and slender twigs.

Underground nymphs feed on plant roots before reaching maturity. Their impact tends to be modest for well established trees and shrubs. In most landscapes the root feeding does not result in noticeable long term decline.

Which Trees And Shrubs Are Most Affected

Young trees and recently planted shrubs are generally more vulnerable than mature specimens. The presence of new growth offers more opportunities for oviposition by female cicadas. Species that bear thin twigs or have delicate shoots are commonly affected more than those with hard woody growth.

In addition to twig quality, the vigor of the plant matters. Trees and shrubs that are under drought stress or nutrient deficiency tend to show more visible symptoms when cicadas are present. Overall, however, cicadas rarely produce lasting harm to healthy, well cared for landscapes.

Timing and Duration of Cicada Activity

The above ground phase of dog day cicadas is concentrated in the warmest portion of the year. Adults are active for a period of several weeks in most regions and can be heard in a loud chorus during daylight hours. The peak of activity often depends on local climate and heat patterns.

Egg laying occurs over a span of days and weeks as females select branches to deposit their eggs. After mating and egg laying, the adults fade away and the young nymphs descend to the soil to begin a new subterranean life cycle. The overall impact on a landscape tends to be temporary and is followed by recovery in the subsequent growing season.

Management and Prevention Strategies

The management approach for dog day cicadas centers on protecting valuable plants while recognizing that cicadas are a natural part of many ecosystems. It is important to distinguish between ornamental control and actions that could disrupt the broader environment. The following strategies emphasize practicality and landscape health.

Practical Steps for Home Gardeners

• Netting or mesh can be placed over small trees and shrubs to prevent egg laying on vulnerable growth. This approach requires careful setup and removal after the season to avoid damage to plant tissue.

• Pruning damaged branches after the activity period helps the plant recover and maintains an orderly appearance. This practice should be done when trees are dormant so as not to disrupt active growth.

• Maintain good plant health by supplying adequate water and balanced nutrients. A healthy plant is better able to withstand minor injury and continues to grow and fill in affected areas.

• Avoid broad spectrum insecticides during the months of cicada activity. Such products can harm beneficial insects and disrupt the local ecosystem.

• For high value or young trees, consider temporary protective measures during the peak period of activity. The aim is to minimize egg deposition while sustaining plant vigor.

• Keep the surrounding landscape clean of leaf litter and dead wood that can harbor other pests. A clean environment supports plant health and resilience.

• Monitor trees for signs of stress such as wilting or persistent limb dieback. Early detection allows timely intervention and reduces potential long term impacts.

• If you notice unusual tree decline that continues after the cicada season ends, seek professional advice. A certified arborist can assess structural health and recommend appropriate actions.

Impact on Fruit and Nut Trees

Fruit bearing trees can experience localized damage if a large number of cicadas choose to oviposit on branches that bear fruit. The scarring from egg laying can alter the appearance of the tree and may affect fruit production on highly stressed trees. However, in most ordinary garden situations, fruit yield is not significantly compromised.

Nuts produced by trees in home landscapes are rarely affected in a meaningful way by cicada activity. The overall harvest is more likely to be influenced by weather conditions, pollination, and the overall health of the tree than by cicada presence. Gardeners should not assume that cicadas will ruin crops and should instead monitor trees for problems that arise from multiple stress factors.

Ecological Role and Long Term Considerations

Cicadas play an important ecological role by providing a reliable source of food for birds and other predators. The emergence of large numbers can temporarily support local wildlife and contribute to the balance of the ecosystem. After the mating season, cicadas become part of the nutrient cycle as their bodies decompose.

The presence of cicadas also allows gardeners to observe natural processes in their own yards. This can be an opportunity to study tree health, insect activity, and plant resilience. In addition to potential short term nuisance, cicadas offer a reminder of the complex interactions that sustain healthy landscapes.

Common Myths and Facts

Several myths circulate about dog day cicadas and their impact on trees and shrubs. It is valuable to separate myth from fact to avoid unnecessary interventions. The following points help clarify common assumptions and provide accurate guidance.

First, cicadas do not consume enough sap in most cases to kill established trees. The mechanical action of egg laying helps explain localized branch damage but does not translate into widespread tree death. Second, cicadas do not typically target healthy mature trees in a way that requires drastic protective measures.

Third, insecticide applications during the active period are not a reliable solution and can disrupt beneficial insects. These products may also fail to protect plants because cicadas are present only for a short time and prefer to feed on sap rather than build long term infestations. Fourth, cicadas are not poisonous to people or pets and do not pose a direct threat to household safety.

When To Seek Professional Advice

If a landscape shows signs of persistent decline after cicadas have completed their season, it is prudent to consult an arborist or tree care professional. Areas of concern include significant branch dieback, widespread leaf loss, or visible structural damage. A professional assessment helps determine whether additional management steps are necessary.

In cases involving large trees near structures or power lines, professional input is essential. An arborist can assess risk and recommend targeted actions that preserve tree health while ensuring safety. Early consultation can prevent further complications and provide a clear plan for maintenance and recovery.

Conclusion

Dog day cicadas contribute to the summer landscape as a natural and observable event. They may cause some localized damage to small branches through egg laying and can be a temporary nuisance due to their loud chorus. Established trees and healthy shrubs generally endure cicada activity without lasting harm when proper care and maintenance practices are followed.

A thoughtful approach to garden health includes maintaining vigor, using protective measures for high value plants, and recognizing the ecological role of cicadas. Homeowners can manage concerns with simple steps, observe how their landscape responds, and seek professional advice if necessary. Through careful observation and proactive care, trees and shrubs can continue to thrive even during cicada seasons.