New Research Shows Earlier Biological Control for Raspberry Aphids in Crops
New research from Biobest shows that Micromus-System can control raspberry aphids earlier in the season than previously expected. Scientists confirm that the predator Micromus angulatus remains active at temperatures as low as 12°C, which allows growers to begin biological pest control sooner in protected raspberry crops.
The large raspberry aphid is a serious pest that damages plants by feeding young growth and producing honeydew, which leads to sooty mould. The pest can also spread plant viruses, creating major risks for crop health and yield. In the past, growers mainly relied on chemical aphicides to manage this problem. However, reduced availability of key chemical products and stricter use limits now make pest control more challenging.
“By enabling earlier biological intervention, this discovery supports a reduction in crop residues, labour-intensive spray applications, and associated environmental impacts,” explains Dr Liam Harvey, Global Technical Specialist at Biobest. “It also has wider implications for improving aphid management in other crops early in the season.”
Researchers found that Micromus angulatus performs effective predation at 12°C, which is three degrees lower than earlier estimates. Activity becomes less reliable below this temperature, but the discovery means growers can begin introducing the predator in early spring, often as early as March or April. This timing is important because aphid populations can increase quickly when temperatures rise, making early control essential.
The findings also challenge the belief that biological control cannot work during cool early-season conditions. Introducing Micromus-System early helps target aphid fundatrices, the first females that hatch from overwintered eggs, preventing population growth before it becomes severe.
In addition to raspberries, this research may benefit other crops such as strawberries, where early aphid management is also important. Early biological intervention can reduce reliance on chemical sprays and support stronger integrated pest management programmes.
These trials were conducted in collaboration with NIAB, Asplins and Charltons, highlighting the importance of research partnerships in improving sustainable agriculture practices.