Scientists are calling for thousands of volunteers to help record sightings of spittle and spittlebugs across the UK. The information will then be used to map the distribution of the insect, to better understand how the deadly plant disease, Xylella, might enter and spread in the UK.
Xylella has struck several EU countries, blighting olive groves in southern Italy and spreading to parts of France and Spain. The UK is currently clear of the disease, but is on high alert.
There are a huge number of plants the Xylella bacterium could affect, from garden plants like rosemary and lavender to oak trees. Dr Rebekah Robinson, senior plant pathologist at the Royal Horticultural Society explains, “Xylella has 563 different host plants worldwide, so it affects a huge range of different species. One of the really devastating things that could happen is that it could actually affect our native tree species as well, things like oak trees, a number of different ash species, sycamore – key plants in our landscape.”
What is Xylella?
Xylella fastidiosa arrived in Europe six years ago. The disease is caused by a bacterium which is moved from one plant to another by plant-sucking insects such as the spittlebug. According to experts, Xylella is one of the most dangerous pathogens worldwide.
If found in the UK, all host plants within 100m would need to be destroyed and there would be immediate movement restrictions on some plants within a 5km radius for up to five years.
- Small, sap-sucking insects which are also known as froghoppers
- Can be found in UK gardens, meadows, grasslands and woodlands from April to late June
- The most common species in the UK is the meadow spittlebug (Philaenus spumarius). Adults are 0.5cm long and vary in pattern and colour from pale brown to black and can jump many times their body length
- The red-and-black spittlebug hatches out on the roots of plants, rather than in blobs of spittle on plant stems
- There are ten species of spittlebug in the UK and the young – called nymphs – all produce whitish, frothy blobs of spittle on leaves and branches.
Record your sightings
Dr Alan Stewart, Reader of Ecology at the University of Sussex said we need to learn as much as we possibly can about what kinds of plants they feed on, what habitats they occupy, and where they are in the country – “So, ultimately, if the worst possible happens, and the disease does arrive in Britain, we’ll be able to make some really good predictions about how it’s likely to spread and how quickly.”
The spittlebugs are not pests in themselves and do not damage plants, said Dr Robinson, “We don’t want you to go round squishing the spittlebugs, but we do want to understand where they’re living,” she added.
Record where and when you’ve seen spittle or spittlebugs, by using iRecord for your sightings.
Find out further information about the survey and the insects on the Xylem feeding insects website