Industry data from Silverleaf Whitefly (SLW) resistance monitoring showed a rapid increase in pyriproxyfen resistance in the 2016-17 season and continues to be a concern.
To reduce the risk of SLW developing widespread pyriproxyfen resistance and potential product failure, Cotton Growers’ Associations (excluding Central Queensland) have nominated a voluntary 30-day window for each region in which pyriproxyfen can be applied.
The aim of narrowing the pyriproxyfen window is to minimise consecutive generations of SLW being exposed to resistance selection, and ensure the product is being applied once per season when most effective. These regional windows are now either already open, or are scheduled to open within the next 10 days.
Reminder - when controlling SLW populations:
- All spray decisions should be made based on the SLW matrix in the Cotton Pest Management Guide
- Growers and consultants should check their regional window before applying pyriproxyfen
- Growers or consultants with concerns regarding their ability to manage SLW within their regional window should contact Sally Ceeney, TIMS Committee Executive Officer by calling 0459 189 771 or emailing Sally Ceeney