Understanding Leatherjackets and Their Effects

Crane fly larvae, or immature crane flies, dwell in the soil and consume grassroots and decomposing plant matter. Activity peaks in spring and autumn, often resulting in thinning turf and increased surface vulnerability. On grounds in use, this can interfere with play and increase upkeep requirements.

Spotting the Signs Early

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

The Seasonal Cycle of Larval Damage

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

Cultural Approaches to Control

Many turf professionals rely on cultural practices. Aerating the ground promotes deeper root growth and more resilient 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 build resistance, though they don’t eradicate infestations.

Biological Control: Nematodes

Beneficial nematodes are a targeted solution that infect crane fly larvae underground. Their success is linked to soil temperature, moisture, and precise application—usually in the first signs of infestation. Used properly, nematodes help turf recover without chemical input.

Chemical Control in Necessary Cases

On frequently used surfaces like playing fields, chemical products may be justified. Only licensed products should be used, and always according to regulation and guidance. Combining targeted chemical use with other strategies often leads to more sustainable turf conditions.

Steps to Minimise Risk

Future-proofing turf involves managing drainage, reinforcing root systems, and ensuring adequate nutrient levels. After crane fly emergence in late summer, checking the grounds helps forecast the next season’s risk. Proactive measures cut future impact over time.

FAQs About Leatherjackets and Control

• When are larvae most active?
  
  Activity is highest in moderate soil temperatures.



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



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



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



• 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 vigilance, timely actions, and a combined approach. Grounds treated with this awareness are more likely to perform well across all seasons.

For more info support with implementation, visit ALS Contract Services.