Just Another Brix in the Wall

Can high Brix really stop aphids? Probably not in the simple way it is sometimes claimed. But the observation opens up a much more interesting question about plant physiology, nitrogen assimilation, crop stress and BYDV risk.

This autumn, many early-drilled cereals are establishing in warm soils after dry seedbeds, with residual nitrogen still available and some fairly strong herbicide programmes already applied. A two- or three-leaf cereal is trying to build roots, develop photosynthetic capacity, process nitrogen and recover from chemical stress — all while aphids are active.

That makes me less interested in a single Brix number and more interested in how well the plant is functioning as a whole system. Is nitrogen being efficiently assimilated? Is the crop metabolically stressed? Is the rhizosphere functioning? What role might silicon, micronutrients and natural enemies play?

The point is not that nutrition, biology or Brix can “control” BYDV. They can’t. BYDV risk is the result of many interacting factors — drilling date, virus pressure, aphid activity, crop stage, plant physiology, genetics, natural enemies and agronomy.

The strength comes from the wall, not from any single brick.

Read the full article on Substack →https://ashleyagronomy.substack.com/p/just-another-brix-in-the-wall?r=8ab6ov&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true