Wheat Freeze Damage more Apparent, so are Viruses

Chad Lee, Extension Agronomist, University of Kentucky

Bleached head from freezing temperatures.
Source: Kenny Perry, Graves County ANR Extension Agent

The freeze damage on wheat became more apparent this week. The damage is spotty and tends to be more severe in the low areas of fields. Much of the wheat appears to have survived, but scouting to assess damage within fields is difficult. In order to understand the extent of damage within fields, almost the entire field needs to be walked. At the very least, the highest and lowest elevations need to be examined.

Bleached heads are a clear indication of freeze damage to heads. Girdling around the stem would be another indication of freeze. Heads that appear bent over may be a sign of damage to the stem directly beneath the head. As more days pass,  symptoms will become more visible (if damaged occurred). For more on wheat freeze damage, visit the Wheat Science Newsletter.

In central Kentucky, we are seeing a lot of Barley Yellow Dwarf Virus (BYDV) on wheat. In some cases, fields were sprayed with an insecticide. In at least one case, the field was sprayed twice. In other cases, people scouted fields, followed aphid thresholds and elected not to spray. In all cases, the warm winter most likely elevated aphid levels and climate and biology overwhelmed chemistry.