Why Leatherjackets Affect Grounds

Crane fly larvae, commonly referred to as grubs, dwell in the upper layers of soil, where they damage grassroots and decaying material. Their presence is most problematic in transition months, and their activity can lead to soft ground and poor turf condition. Managed landscapes may become unusable without proper control.

How to Spot an Infestation

Identifying larvae before serious damage occurs is wise. Watch for signs such as increased bird activity, thinned areas, and irregular surface wear. Cut test squares in the turf to observe larvae beneath. Conducting these checks during cooler months supports better planning.

Understanding Larval Cycles

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 expose larvae, leaving them open to natural predation. These methods help maintain turf quality, even if they do not fully eliminate the pests.

Biological Pest Control

Nematodes, microscopic beneficial organisms, offer a natural way to address larvae. They are most effective when applied during early autumn, under favourable 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 current regulations. Blending chemical input with cultural and biological steps prevents overuse.

Looking Ahead: Preventive Measures

To avoid outbreaks in future seasons, aim to improve drainage, support strong rooting, and maintain balanced nutrient levels. Monitoring turf after crane fly emergence in late summer indicates larval activity levels for the months ahead.

Frequently Asked Questions

• When do leatherjackets feed the most?
  
  They tend to be feeding 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.


 
• get more info
• Does mowing height matter?
  
  Yes. Leaving grass slightly longer during larval feeding helps reduce plant stress.


 
• crane fly larvae controlclick here
• Why are birds damaging my lawn?
  
  Birds often dig where larvae are present. Their behaviour can be an early indicator of infestation.

 

Summary

Managing crane fly larvae involves a mix of early detection, well-timed treatment, and varied management strategies. By combining physical methods, biological control, and limited chemical use, turf conditions can be protected throughout the year.

Need professional help? Visit ALS Contract Services for more information.