Networks

The suction trap network

The traps

We operate 16 suction-traps in the UK, each 12.2 metres tall. The traps are emptied daily in spring, summer and autumn, weekly in winter. Aphids are identified at Rothamsted and SASA (Edinburgh), counted, and recorded on our long-term database.

Forecasts and pest control

We have found strong relationships between winter temperature and the time that aphids are first found in our traps, and their abundance. We use these relationships to forecast when movement into crops is likely to start, and to predict the impacts of climate change on pest problems. Compared to 50 years ago, many aphids are flying a month or more earlier.

Insecticide resistance

We test individual aphids, in particular the major pests Myzus persicae (Peach–potato aphid) and Sitobion avenae (English grain aphid), for their resistance to a range of insecticides. Molecular tools are used to detect the mutations conferring resistance.

The Light Trap Network

The traps

We currently have 84 light-traps in a wide range of habitats. Each trap uses a 200 watt tungsten bulb. Most traps are emptied daily throughout the year. The moths are identified by volunteers and by a contractor, counted and recorded on our long-term database. Samples are not stored.

Moth abundance and distribution

We have shown that two-thirds of our common larger moth species have declined significantly over the past 50 years, especially in southern Britain. This is worrying as moths are good indicators of the health of the environment and are important components of the food chain. However, one third of species have become more abundant. The reasons for the changes are being investigated and will inform conservation strategy.

Not just moths

Other insects have been studied by volunteers on an ad hoc basis, resulting in numerous publications, several first records of insect species in the UK and at least one species new to science.

Wider applications

The data are used in a wide-range of projects, most of them aimed at understanding population dynamics and community structure in the face of environmental changes, and developing conservation strategies.