A seven-fold increase in soil samples testing positive for root-knot nematodes in cereals indicates that the pest may be more prevalent in soils than previously thought, according to a leading expert at Fera Science.

Testing undertaken by its nematologists has revealed a distinct uplift in this pest in recent years. Experts now fear that it will have a bearing on rotational decisions in the run-up to autumn planting.

“These are host-specific nematodes that attack cereal crops,” confirms the leading science firm’s nematologist, Tom Prior. “They can cause serious damage to the root system of a crop, leading to reduced vigour, patchy crops and lower yields.

“But, nematode infestations are difficult to diagnose in the field, with damage commonly overlooked or attributed to other pathogens or nutrient deficiency. There’s a simple solution. By opting for a non-cereal host crop following infested cereals in the rotation, the pest’s lifecycle is broken.”

He urged producers to consider soil testing to identify if nematodes – and which species – are impairing cereal yields, before finalising rotational decisions. “With margins continuing to be challenged, every aspect of crop management is being reviewed and nematode presence should not be ignored.” he argued

Paul Cawood, of advisory sepcialist, Frontier, addde: “It is vital farmers adopt a stable and sustainable cropping rotation for their farm. Where you suspect nematode damage, make sure you find out the species.

“It is important to stress, though, that at the moment cereal nematode damage is relatively rare. However, increasing levels should not be ignored, especially as the populations are easily controlled by simple changes in management, such as a change in cropping.

“I suggest considering the use of a brassica cover crop. An example of this would be planting oil radish of a multi-resistant type. Specific varieties have shown good reduction of root-knot nematode populations when grown in certain conditions. It can also offer beneficial nutritional value to your soil.”