Are Apache Cicadas Harmful to Plants and Crops?

Cicadas are fascinating insects known for their distinctive sounds and unique life cycles. Among the many species of cicadas, the Apache cicada (genus Diceroprocta) is commonly found in parts of the southwestern United States. Gardeners, farmers, and plant enthusiasts often wonder whether these insects pose any threat to their plants or crops. This article aims to explore whether Apache cicadas are harmful to plants and crops, examining their biology, behavior, and impact on agriculture.

Understanding Apache Cicadas

Apache cicadas belong to the family Cicadidae and are native to arid and semi-arid regions such as Arizona, New Mexico, and Texas. Unlike periodical cicadas that emerge in large, synchronized swarms every 13 or 17 years, Apache cicadas have much shorter life cycles, often emerging annually or every few years.

Life Cycle and Behavior

Apache cicadas spend most of their life underground as nymphs, feeding on sap from plant roots. After several years underground – typically 2 to 5 years depending on environmental conditions – they emerge as adults during the summer months. Adult cicadas live for about 4 to 6 weeks, during which they mate and lay eggs on plant stems.

Adult male cicadas produce loud mating calls by vibrating membranes called tymbals on their abdomens. This distinctive sound is often heard throughout the day and into the evening during cicada emergence periods.

Feeding Habits of Apache Cicadas

To understand if Apache cicadas harm plants and crops, it’s essential to examine how they feed at different stages of their lifecycle.

Nymph Stage: Root Sap Feeding

While underground, nymphs use specialized mouthparts called stylets to pierce plant roots and suck out sap. This feeding generally occurs on a wide variety of hardwood trees, shrubs, and herbaceous plants.

• Impact on Roots: The feeding damage caused by nymphs is usually minimal because they consume only small amounts of sap.
• Plant Health: Most healthy plants tolerate this root feeding without significant stress or decline.

Adult Stage: Stem Oviposition and Feeding

Adult females use their ovipositors to cut slits into twigs or branches where they lay eggs. This process can cause:

• Twig Damage: The egg-laying cuts sometimes cause twigs to die back or break off.
• Feeding on Plant Fluids: Adults also feed on xylem fluids from branches using their piercing mouthparts.

Adult feeding is generally light compared to other insect pests and rarely causes significant damage by itself.

Are Apache Cicadas Harmful to Plants?

The damage from Apache cicadas is primarily related to two factors: egg-laying injury (oviposition) and root sap consumption by nymphs. Let’s analyze these impacts in more detail.

Oviposition Damage

When female Apache cicadas cut into twigs to lay eggs:

• Flagging: Small branches may wilt and die back—a condition called “flagging.”
• Structural Damage: Repeated egg-laying over several seasons may cause noticeable branch loss.
• New Growth Impact: Young trees or shrubs may be more susceptible since they have fewer branches.

However, this damage tends to be limited in scope:

• Most mature trees can withstand the occasional twig loss without serious health consequences.
• The damage usually looks unsightly but does not kill branches outright.
• Unlike some other borers or wood-boring insects, cicada oviposition wounds do not provide easy entry points for pathogens or fungi.

Nymph Root Feeding

Because nymphs feed underground for several years:

• Sap Drainage: There is concern that extensive feeding might weaken small plants.
• Root Injury: Severely infested roots may suffer minor mechanical damage from stylet feeding.
• However, root damage caused by cicada nymphs rarely reaches levels that threaten plant survival unless the plant is already stressed by drought or disease.

Comparison with Other Insects

Compared with other insect pests such as aphids, scale insects, or borers:

• Apache cicada damage is relatively minor.
• They do not defoliate plants or bore deeply into trunks.
• They are not known vectors for plant diseases.

Crop-Specific Considerations

Apache cicadas do not typically infest agricultural crops heavily. Most crops grown in areas where Apache cicadas exist are annual plants or herbaceous and thus do not attract long-term root-feeding nymphs in large numbers.

In fruit orchards or vineyards:

• Some twig damage may occur but usually does not impact overall yield.
• In rare cases where high adult populations coincide with sensitive young trees, some temporary stress might be observed.

Ecological Roles of Apache Cicadas

While concerns about potential harm exist, it is important to recognize that Apache cicadas play valuable ecological roles:

Soil Aeration

Nymph burrowing activities help aerate the soil around roots, improving water infiltration and nutrient cycling.

Food Web Contributions

They serve as an important food source for birds, reptiles, mammals, and predatory insects throughout their lifecycle.

Nutrient Cycling

After adults die off post-mating season, their bodies contribute organic matter back into the soil.

These ecological benefits often outweigh the minor damage caused by their feeding behaviors.

Management Strategies for Apache Cicadas

For gardeners or farmers worried about potential damage from Apache cicadas, management practices focus primarily on mitigating oviposition injury during peak adult activity periods:

Physical Barriers

Wrapping tree trunks with protective materials can prevent females from accessing suitable sites for egg-laying.

Pruning

Removing flagging twigs reduces the aesthetic impact and discourages further damage.

Monitoring Population Levels

Because cicada emergences are predictable based on life cycle timing, monitoring adult activity can help plan preventive measures in sensitive areas.

Avoiding Chemical Controls

Chemical insecticides are generally ineffective against adult cicadas due to their brief above-ground presence and singing behavior. Moreover, indiscriminate use of pesticides can harm beneficial insects and disrupt ecosystems.

Conclusion: Are Apache Cicadas Harmful?

Apache cicadas are largely benign insects regarding plant health. While some minor physical damage occurs due to egg-laying cuts on twigs and root sap feeding by nymphs underground, these impacts rarely translate into significant harm for mature trees or crops. Most plants tolerate these injuries well without lasting effects.

In agricultural settings, particularly with annual crops or established orchards, the risk posed by Apache cicadas is minimal. Their ecological benefits — including soil aeration and supporting food webs — further suggest that these insects should be appreciated rather than feared.

For gardeners concerned about twig flagging in young trees or ornamental shrubs, simple protective measures such as pruning affected branches can mitigate cosmetic damage. Overall, understanding the biology of Apache cicadas helps plant growers coexist peacefully with these intriguing insects without resorting to harmful control methods.