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Bibionid flies (Fever Fly, St Marks Fly)

Bibionid flies (Fever fly, St Mark’s Fly) are stout, black, hairy flies with short wings, ranging from 6 to 10mm long. Swarms of Bibionid flies can sometimes be seen hovering above the lawn on sunny days. Adult Fever Fly can be seen from March to October. Another common species, the St Mark’s Fly (so-called because they emerge around St Mark’s day) appear between the end of April and May.

Bibionid flies lay around 30 eggs at a time, resulting in small clumps of larval activity. Eggs are laid in grassland or soils high in organic content between May and August and hatch in late summer. The larvae can be pale or dark grey/brown with a dark brown/black head and are between 13 to 15mm long with no legs. 

They are similar in appearance to leatherjackets, however bibionids do not have legs and their body is relatively long and thin compared to leatherjackets.

The larvae usually feed on organic matter around the base of the grass plants. Occasionally, small yellowing patches can occur during November & December where the roots have been severed. Secondary damage may also be caused by birds searching for grubs.

Info Centre- fever fly close up on surface

There are currently no chemical controls for use against Bibionid flies, however reducing organic matter by removing clippings and managing thatch levels can help to control them.

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Important update: Temporary 6.5% surcharge effective 7 April 

At Rolawn, we are committed to maintaining the high standards of quality and service our customers expect, so we want to be open with our customers about a change that will affect pricing from Tuesday 7th April. 

This decision has been taken in response to disruption to energy supplies, which has led to significant increases in wholesale prices, affecting not only fuel and fertiliser but also costs throughout our wider supply chain. As a business that relies heavily on fuel for both transport and operations, these sustained cost pressures have become increasingly difficult to absorb.  

While we have worked hard to mitigate the impact, the scale and pace of recent price increases have now exceeded what we can sustain internally, and we therefore need to recover a proportion of these externally driven increases. 

From Tuesday 7th April, a temporary 6.5% surcharge will apply to all products.  

We know that any increase in price is frustrating, particularly at a time when many businesses and households are already feeling under pressure. That is why we want to be clear that this is not a decision we have made lightly, and not one we wanted to make. It has been introduced solely to help offset unavoidable cost inflation and allow us to continue delivering the quality, reliability and service standards associated with Rolawn. 

We will continue to monitor market conditions closely and will review this surcharge as soon as circumstances allow, providing reasonable notice of any changes. We recognise that any price increase is unwelcome, but this step is necessary to ensure the continuity and reliability of our operations during a period of ongoing uncertainty. 

We remain committed to providing the quality, reliability and service standards you expect from Rolawn, and we truly appreciate your understanding and continued support. 

If you have any questions, please contact our customer support team who will be happy to help.