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LEATHER JACKETS – Turf Pest Control

About Leatherjackets


Leatherjackets, also known as Daddy Long Legs, are the larvae of the Crane Fly. Crane Flies are an insect within the Tipulidae family. The Crane Fly comes to the attention of the turf manager in its Leatherjacket larval stage. There are two species of Crane Fly in the UK that damage turf, Tipula paludosa and T. oleracea.

The Leatherjackets feed on the roots of the grass plant making the plant more susceptible to disease and killing the plant. Major damage to the turf can be done by predators that are after an easy and abundant meal, starlings and other birds can congregate in vast numbers and decimate surfaces in a very short period of time. Climatic factors play a larger role in population control than the presence of predators. Damage to turf can be seen from September through the autumn, winter and into the spring.



The first indication of a problem is usually birds pecking and damaging the surface, in severe infestations the turf turns yellow in patches and bare areas start to appear. Lift back the turf to find Leatherjackets feeding on the roots of the grass plant; they generally feed at the edge of an infected area. The larvae are a typical grub shape: an elongated grey/brown tubular body without any legs, up to 30mm long. The adults look similar to very large mosquito’s although they have a very distinct ungainly flight unlike a mosquito’s flight. Their bodies are long and thin, so much so, that it is very easy to break off their legs when trying to catch them. Adult Crane Flies do not damage turf, nor do they bite or sting.


• The adults hatch from grassland in August and September.
• Adults mate and lay eggs in grassland.
• Eggs hatch two to three weeks later and the larvae start to feed on grass roots throughout the autumn and into the spring.
• The grubs pupate in late May and June.
• The adults hatch from grassland in August and September.

Methods of Control

Attention to the problem is generally brought about by predators although preventative measures as well as curative action can be adopted to help prevent Leatherjackets damaging areas of turf. Control of Leatherjackets is relatively easy using broad-spectrum insecticides but distinguishing which areas require applications in advance of the damage remains the major problem.

Biological control – The nematode Steinernema feltiae is commonly used as a biological control. seek out the leatherjackets and attack the pest by entering natural body openings. The nematodes infect their host with a bacteria which stops the Leatherjackets from feeding, quickly killing them. The nematodes then feed upon the Leatherjackets, breeding and dispersing to encounter further Leatherjackets.

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      “The lawns had begun to deteriorate over time and were full of weeds such as Daisies, Dandelions and Speedwell. The mature shrubs and bedding plants meant that it was a tricky job calling for expertise that we don’t have. We contacted the ALS Contracts Team because of their professional reputation, we’ve used them before and found them to be very good. We were contacted the day before to finalise arrangements, we’d elected for an early morning spray to avoid conflict with the public and the ALS team turned up on time and ready to get stuck in. Before I knew it they’d applied the herbicide and were applying the granular fertiliser. It was evenly applied and despite the proximity of delicate plants not a single plant was damaged, no signs of scorch or baulk marks which meant that it all went exactly where I wanted it. I could see the Daisies starting to die later that same day. The overall effect has been amazing, it really sets off the planting display. Bridgnorth is being judged by the Britain in Bloom Awards in a fortnights time so to have the lawns looking so weed-free and consistent really adds the finishing touches. Very impressed with the ALS Contracts Team.”
      Anthony Ellis, Bridgnorth Town Council