General Agronomic Advice for Spraying Herbicides on Cereal
Crops During Times of Crop Stress
Herbicide performance is directly related to the
environmental conditions at the time of application. These conditions,
including frost, drought, wind and disease, are all common stresses that affect
crop development.
Cool temperatures during spraying time are a
common occurrence in southern Alberta, due to our early seeding dates. For
agronomic purposes, any temperature below 5°C is considered a stress on a
cereal crop. Good agronomy indicates that it is poor practice
to spray any herbicides product when stress conditions of this nature are
present or anticipated.
However, time restrictions often dictate that
a herbicide be applied outside the optimum conditions. Knowledge of
the following parameters will assist in setting expectations when faced with
these stresses. When applying herbicides outside the label
recommendations, the following agronomic information should be considered:
