Why Leatherjackets Affect Grounds

Crane fly larvae, commonly referred to as grubs, exist in the upper layers of soil, where they consume grassroots and plant material. Their presence is most noticeable in moderate seasons, and their activity can lead to soft ground and weakened turf condition. Public lawns may become unusable without proper control.

How to Spot an Infestation

Identifying larvae before serious damage occurs is beneficial. Watch for signs such as bird pecking, patchy grass, and irregular surface wear. Cut small patches in the turf to check for larvae beneath. Conducting these checks during cooler months supports better planning.

Seasonal Risks to Grass Condition

Leatherjackets can remain active underground during milder winter spells. If they are not managed, the turf’s ability to recover in spring is delayed. Maintenance scheduling based on known behaviour helps reduce pressure on affected areas.

Tackling the Problem Without Chemicals

Turf professionals often begin with physical practices. Regular aeration encourages root growth and improves turf firmness. Raising mowing height during feeding periods can improve resilience, and rolling moist turf may lift larvae, leaving them open to natural predation. These methods help improve turf quality, even if they do not eradicate the pests.

Biological Pest Control

Nematodes, microscopic bioagents, offer a natural way to address larvae. They are most effective when applied during early autumn, under suitable moisture and temperature conditions. When timed and applied correctly, they reduce larval numbers and allow the turf to stabilise.

Supplementing with Registered Products

In some cases—especially on frequently used surfaces—chemical treatment may be necessary. Approved turf protection products may be applied, but only according to regulatory guidance. Blending chemical input with cultural and biological steps prevents overuse.

Reducing Future Risk

To minimise outbreaks in future seasons, aim to optimise drainage, encourage strong rooting, and maintain steady nutrient levels. Monitoring turf after crane fly emergence in late summer offers insight into larval activity levels for the months ahead.

Frequently Asked Questions

• When do leatherjackets feed the most?
  
  They tend to be present in greater numbers during cool and moist periods in autumn and spring.



• How can I be sure I have a problem?
  
  Cut out a section of turf and count the number of larvae beneath. This provides a practical population check.



• Can nematodes survive in cold soil?
  
  No. They require specific temperatures and soil moisture to be effective.



• Does mowing height matter?
  
  Yes. Leaving grass slightly longer during larval feeding helps support plant health.



• Why are birds damaging my lawn?
  
  Birds often scratch where larvae are present. Their behaviour can be an unintended clue of infestation.

Main Takeaway

Managing crane fly larvae benefits from a blend of early detection, well-timed treatment, and varied management strategies. By coordinating physical methods, biological control, and limited chemical use, turf conditions can be maintained throughout the year.

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