The last couple of days the weather has given us some dry sunny
weather with high winds. This has been great to have fields finally dry off and
make strides with planting any remaining acres.
Unfortunately, this also exposed young small grain seedlings to the same
conditions. The daytime heat at the soil surface has caused heat canker. The
tender young tissue at the soil surface basically has been ‘cooked’ and this
appears as a yellow band that is slightly constricted (Photo 1). As the leaf
continues to grow, this yellow band (1/8 - 1/4") moves upward and away
from the soil surface. If the hot and dry weather lasts for several days,
repeated bands can become visible. Because of the high
winds, the tips of leaves may break off at the yellow band and give a field a
very ragged appearance. Damage from heat canker is temporary and should not
affect further growth and development.
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| Photo 1 – Barley seedlings with the yellow, constricted appearance symptomatic for heat canker (photo courtesy of Luke Steinberger) |
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