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Sunday, April 15, 2012

Frost Damage to Apple Flowers

Karl Foord, Extension Educator, Horticulture

Temperatures in the mid to low 20's were encountered last Tuesday April 10th in many parts of central and southern Minnesota. Apple fruit flowers are damaged at temperatures lower than 28 degrees F. depending on the stage of the flower bud and the length of time at the low temperature. The more open the flower bud the more susceptible the bud is to low temperature damage.

The following picture gallery shows the types of frost damage experience by apple flowers in Chaska, Minnesota. The gallery begins with heathy flowers with green stigmas and cream anthers, shows partially damaged flowers with dead stigmas and some dead anthers, and finally a flower will all parts killed.

Karl Foord

Photo 1: Healthy Apple Flower

Karl Foord

Photo 2: Healthy or partially damaged apple flower

Karl Foord

Photo 3: Totally damaged flower top left and partially damaged flower bottom right

Karl Foord

Photo 4: Frost killed apple flower with brown stigmas and anthers

Karl Foord

Photo 5: Frost killed apple flower with brown stigmas and anthers

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