The Problem with Leatherjackets

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

Detecting Larval Activity Quickly

Identifying larvae before serious damage occurs is essential. Watch for signs such as bird pecking, thinned areas, and irregular surface wear. Cut small patches in the turf to check for 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 hindered. Maintenance scheduling based on weather conditions helps reduce pressure on affected areas.

Cultural Turf Management

Groundskeepers often begin with physical practices. Regular aeration strengthens root growth and improves turf firmness. Raising mowing height during feeding periods can reduce stress, 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 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 suppress larval numbers and allow the turf to recover.

When to Use Approved Chemicals

In some cases—especially on high-demand surfaces—chemical treatment may be necessary. Registered turf protection products may be applied, but only according to label instructions. Blending chemical input with cultural and biological steps preserves soil health.

Avoiding Repeat Infestations

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

Frequently Asked Questions

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



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



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



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



• Why are birds damaging my lawn?
  
  Birds often peck where larvae are present. Their behaviour can be an early indicator of infestation.

Final Advice

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 get more info help? Visit ALS Contract Services for more information.