What Are Crane Fly Larvae?

Crane fly larvae, or leatherjackets, nest in the soil and consume grassroots and decomposing plant matter. They are most active in spring and autumn, often resulting in loose turf and increased surface vulnerability. On grounds in use, this can interrupt play and increase upkeep requirements.

Detecting Leatherjacket Presence

Feeding birds, bare turf, and asymmetrical damage often signal larval feeding. Cutting small turf squares allows for density checking. Regular observation in late winter and early spring enables prompt treatment decisions.

Turf Care During Key Seasons

Leatherjackets stay below ground during winter but will consume roots if conditions permit. Neglected populations cause slow turf recovery as temperatures rise. Knowing their behaviour enables grounds teams to plan maintenance that anticipates seasonal stress.

Non-Chemical Management

Many turf professionals rely on cultural practices. Soil aeration promotes deeper root growth and healthier swards. Adjusting mowing height minimises turf stress. Rolling in damp conditions can bring larvae closer to the surface, making them easier for natural predators to reach. These measures improve turf strength, though they don’t completely remove infestations.

Biological Control: Nematodes

Natural nematodes are a biological solution that destroy crane fly larvae underground. Their effectiveness is linked to soil temperature, moisture, and timed application—usually in late summer. Used properly, nematodes can significantly reduce larval numbers without chemical input.

Chemical Control in Necessary Cases

On high-traffic surfaces like playing fields, chemical products may be warranted. Only licensed products should be used, and always as per regulation and guidance. Combining selective chemical use with other strategies often leads to stable turf conditions.

Preventing Future Infestations

Future-proofing turf involves improving drainage, reinforcing root systems, and ensuring balanced nutrient levels. After crane fly emergence in late summer, surveying the grounds helps forecast the next season’s risk. Proactive measures minimise larval development over time.

FAQs About Leatherjackets and Control

• When are larvae most active?
  
  Activity is typically observed in autumn and spring.



• How do I check for infestation?
  
  Cut small turf squares and count larvae beneath to estimate infestation levels.



• Are nematodes effective in cold soil?
  
  No, they need certain temperatures and moisture levels to work properly.


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• Should I alter mowing height?
  
  Yes, longer grass during feeding seasons can support recovery.



• What causes birds to peck at turf?
  
  Birds are usually attracted to larvae near the surface. This is often an early indication of a problem.

Key Points

Managing crane fly larvae requires regular attention, strategic actions, and a multi-method approach. Grounds treated with this methodology are more likely to stay usable across all seasons.

For support with implementation, here visit ALS Contract Services.