Why Leatherjackets Affect Grounds

Crane fly larvae, commonly referred to as leatherjackets, exist in the upper layers of soil, where they feed on grassroots and organic material. Their presence is most problematic in transition months, and their activity can lead to fragile ground and deteriorating turf condition. Sports fields may become difficult to maintain without proper control.

Recognising Early Signs

Identifying larvae before serious damage occurs is wise. Watch for signs such as increased bird activity, patchy grass, and irregular surface wear. Cut test squares in the turf to observe larvae beneath. Conducting these checks during late winter helps with timely responses.

How the Seasons Influence Turf Health

Leatherjackets can continue feeding underground during milder winter spells. If they are not monitored, the turf’s ability to recover in spring is limited. Maintenance scheduling based on seasonal patterns helps reduce pressure on affected areas.

Physical and Mechanical Solutions

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

Supplementing with Registered Products

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.

Reducing Future Risk

To avoid outbreaks in future seasons, aim to optimise drainage, encourage strong rooting, and maintain steady nutrient levels. Monitoring turf after crane fly emergence in late summer offers insight into 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 dig where larvae are present. Their behaviour can be an early indicator of infestation.

Summary

Managing crane fly larvae requires a combination 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.

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