What Are Crane Fly Larvae?

Crane fly larvae, or leatherjackets, nest in the soil and attack grassroots and decomposing plant matter. Activity peaks in mild weather, often resulting in thinning turf and increased surface vulnerability. On grounds in use, this can interfere with play and increase upkeep requirements.

Early Indications of Infestation

Feeding birds, bare turf, and irregular patches often signal larval feeding. Cutting inspection areas allows for density checking. Scheduled observation in cool months enables prompt treatment decisions.

Turf Care During Key Seasons

Leatherjackets remain hidden during winter but will continue feeding if conditions permit. Neglected populations cause slow turf recovery as temperatures rise. Knowing their behaviour allows grounds teams to plan maintenance that reduces seasonal stress.

Manual and Physical Tactics

Many turf professionals begin with cultural practices. Aerating the ground promotes deeper root growth and sturdier swards. Adjusting mowing height minimises turf stress. Rolling in damp conditions can bring larvae closer to the surface, making them easier for predatory birds to reach. These measures enhance tolerance, though they don’t completely remove infestations.

Nematode Use in Turf Health

Beneficial nematodes are a biological solution that infect crane fly larvae underground. Their success is linked to soil temperature, moisture, and timed application—usually in the first signs of infestation. Used properly, nematodes can significantly reduce larval numbers without chemical input.

Responsible Use of Pesticides

On frequently used surfaces like sports turf, chemical products may be required. Only authorised products should be used, and always in line with regulation and guidance. Combining selective chemical use with other strategies often leads to stable turf conditions.

Long-Term Larvae Management

Future-proofing turf involves managing drainage, reinforcing root systems, and ensuring balanced nutrient levels. After crane fly emergence in late summer, checking 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 most intense in moderate soil temperatures.



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



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


here
• Should I alter mowing height?
  
  Yes, longer grass during feeding seasons can offer protection.



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

Final Word

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

For here support with implementation, visit ALS Contract Services.