BYDV management tool

2019 tool under construction

Barley/cereal yellow dwarf viruses (BYDV) are mainly transmitted by the bird cherry–oat aphid and the grain aphid.

Initially, aphids colonise relatively few crop plants. When the second generation offspring are produced, these tend to move away from the plant originally colonised. Controlling this generation is a key component of a BYDV management strategy.

The timing of the second generation can be approximated by accumulating daily average air temperatures above a baseline temperature of 3ºC. It takes around 170 ‘day degrees’ (DD) for the second generation to be produced.

This tool can be used to calculate when the 170DD threshold has been reached at sites in our weather station network.