Determining the action threshold

The action threshold developed for Russian wheat aphid (RWA) is ‘dynamic’. This means that yield potential, market value of the crop, and cost of control are factored into each season’s calculation.

At GS30 determine the RWA Action Threshold using the online RWA GS30 Threshold Calculator.

You will need to have estimations for cost of control ($/Ha), cereal market price ($/t), yield potential (t/ha), and days until GS50 (start of head emergence).

Cost of control includes cost of the product as well as cost of application.