Real-Time Wild Blueberry Phenology - Cooperative Extension: Maine Wild Blueberries - University of Maine Cooperative Extension

Wild Blueberry Phenology Tracker

Phenological Staging Data

Updated 9-24-2020

For past weeks, visit the 2020 Wild Blueberry Phenology Record

Location	Week of:
	Sept. 21st 2020
	Prune Cycle, Bud Development
Hope	Average of 3.21 buds per stem.
Waldoboro	Average of 3.04 buds per stem.
Searsport	Average of 3.58 buds per stem.
Ellsworth	Average of 3.80 buds per stem.
Deblois	Average of 7.00 buds per stem.
Montegail	Average of 4.60 buds per stem.
Jonesboro	Average of 3.70 buds per stem.
Crawford	Average of 3.79 buds per stem.
Marion	Average of 3.54 buds per stem.

See development stages below.

Wild Blueberry Staging Guide by Hildebrand and Braun 1991.Hildebrand, P.D., and P.G. Braun. 1991. Factors Affecting Infection of Lowbush Blueberry by Ascospores of Monilinia Vaccinii-Corymbosi. Canadian Journal of Plant Pathology 13(3): 232–240.

Wild Blueberry Phenological Developement

Early Green Fruit

Development Key

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Bud Stages
T0	Buds are dormant and dark with scales tightly closed.
T1	Buds continue to swell with scales separating. Flower parts start to round inside bud.
T2	Buds continue to swell with scales separating.
T3	Bud scales separate fully with flower tips visible.
T4	Petals (corolla) in flower bud are visible, but remain closed.
T5	Pre-bloom; petals (corolla) extend beyond the green base of the bud (calyx), but remain closed.
Leaf Stages
V0	Buds are dormant and dark with scales tightly closed.
V1	Spikey green tissue emerges from a tightly closed buds along stem (spikes < 2mm).
V2	Green tissue continues to emerge and remains spikey (spikes 2-5mm).
V3	Tips of inividual leaves being to separate (emerged tissue > 5mm).
V4	Leaf shoots expand and enlarge in a whorl pattern.

* Sources include: Hildebrand and Braun 1991 and Rutgers University.

Hildebrand, P.D., and P.G. Braun. 1991. Factors Affecting Infection of Lowbush Blueberry by Ascospores of Monilinia Vaccinii-Corymbosi. Canadian Journal of Plant Pathology 13(3): 232–240.