Agriculture & Natural Resources

IPM – Small Grain Thresholds

Pest April May June
Aphids  15 – 25 per head 15 – 25 per head
Cereal leaf beetle 25 total eggs and/or small larvae per100 tillers with 50% in the larval stage 25 total eggs and/or small larvae per 100 tillers  with 50% in the larval stage 25 total eggs and/or small larvae per 100 tillers with 50% in the larval stage
Grass sawfly * 0.4 per row ft. (late April) 0.4 per row ft. 0.4 per row ft. (early June)
True armyworm * Barley – 1 per row ft.      Wheat – 1- 2 per row ft. Barley – 1 per row ft. Wheat – 1- 2 per row ft.

* when both are present – reduce threshold of each by one half