Heat and its effect on canola

July 8, 2020 – Issue 17

Hot days (28-30°C and up) coupled with warm nights (16°C and up) from bud to mid-flowering stages can have a substantial effect on canola yield.Cool nights offer some recovery from hot days. Warm nights do not provide a recovery period, and more flowers are aborted, producing blanks along the stem.

Even with a few days of heat, it can take a week for hormone balance and regular pod formation to return. Recently opened flowers with shortened stamens that don’t protrude above the petals can be a sign of heat damage.

Heat and drought can lead to missing pods, and also greatly reduce the level of sclerotinia stem rot infection. Credit: Nicole Philp

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Canola Watch