Instructions

The degree-day model uses maximum and minimum daily temperature data from 21 June onwards to forecast the flight activity of Etiella moth. For successful control of Etiella, insecticide sprays must target adult moths before females lay eggs. Insecticide sprays are generally warranted where moth numbers exceed 1-2 moths per 20 sweep net samples.

To use the model:

1. Enter coordinates for your desired location by either selecting a point on the map, getting your device location automatically using GPS or internet location, or manually entering coordinates. Then click Update Coordinates, to obtain predicted Etiella degree-day accumulations for the selected location to the current date.
2. Use the slider bar to select years. Comparing predictions with previous years helps you to forecast when the model will reach critical values of 300 or 351 degree-day accumulations. Selecting more years will result in decreased performance of the app as additional temperature data are extracted.
3. The critical value of 351 degree-day accumulations indicates the 10% predicted onset of peak Etiella flight activity. The date the model reaches this value is the date in-crop monitoring of lentil crops should have commenced. It is recommended to commence monitoring lentil crops at approximately 300 degree-day accumulations. Monitor for moths using a sweep net, taking samples of 20 sweeps in at least 3-5 areas of the paddock.
4. View results in the plot and summary table. Click the icon in the top right corner to download the plot.

Temperature data for the selected location are extracted from gridded data at 0.5^o (approx. 5km x 5km) resolution from the Australian Bureau of Meteorology.

An information manual for management of Etiella Moth in crops is available in PDF form. Click the thumbnail below to view and download.

Credits

The SARDI Etiella model was developed by Chris Krawec and Greg Baker (SARDI Entomology), with funding from the Grains Research and Development Corporation (GRDC).

The Etiella app was developed by Dr Kym Perry (SARDI), Sam Rogers (University of Adelaide) and Russell Edson (University of Adelaide), with funding from the South Australian Grains Industry Trust (SAGIT).

Please send all queries and feedback to kym.perry@sa.gov.au.