2021 Wild Blueberry Phenology Record

Please reference the Maine Wild Blueberry Phenology Guide (PDF), for detailed stage identification.

For mapped locations please return to the Real-Time Wild Blueberry Phenology Tracker. See Development Stages Below.

Locations: Waldoboro Hope Searsport Sedgwick Ellsworth Deblois Montegail Jonesboro Wesley Marion
Week 1  4/12/21 to 4/16/21 Crop Cycle Stages % Winter Kill 28.8% 12.3% 19.2% 8.6% 24.7% 24.4% 35.4% 37.5% 10.7%
% T1 Buds 47% 53% 77% 74% 66% 86% 88% 71%
% T2 Buds 31% 38% 20% 12% 18% 0% 6% 0%
% T3 Buds 6% 1% 0% 0% 0% 0% 0% 0%
% T4 Buds 0% 1% 0% 0% 0% 0% 0% 0%
Week 2 4/19/21 to 4/23/21 Crop Cycle Stages % T1 Buds 35% 53% 64% 82% 55% 98% 67% 85% 79% 73%
% T2 Buds 46% 40% 31% 14% 33% 1% 33% 6% 19% 26%
% T3 Buds 17% 5% 2% 0% 5% 0% 0% 0% 0% 0%
% T4 Buds 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%
Update Locations: Warren Hope Searsport Sedgwick Ellsworth Deblois Montegail Jonesboro Wesley Marion
Week 3 4/26/21 to 4/30/21 Crop Cycle Stages % T1 Buds 22% 35% 14% 35% 7% 92% 53% 84% 56% 69%
% T2 Buds 38% 35% 8% 33% 22% 8% 38% 13% 33% 30%
% T3 Buds 24% 17% 60% 7% 23% 0% 9% 3% 8% 1%
% T4 Buds 6% 10% 16% 20% 36% 0% 1% 0% 0% 0%
% T5 Buds 2% 0% 1% 4% 0% 0% 0% 0% 0% 0%
Week 4 4/26/21 to 4/30/21 Crop Cycle Stages % T1 Buds 2% 11% 4% 12% 0% 66% 5% 12% 4% 26%
% T2 Buds 10% 8% 14% 28% 2% 21% 19% 33% 22% 24%
% T3 Buds 26% 37% 48% 30% 22% 12% 41% 30% 28% 24%
% T4 Buds 15% 21% 21% 12% 22% 1% 29% 19% 27% 16%
% T5 Buds 34% 20% 14% 17% 49% 0% 6% 6% 18% 9%
Prune Cycle Emerged Shoot # 4.7 6.2 1.3 0.2 0.2 4.7 1.5 2.3
Week 5 5/03/21 to 5/07/21 Crop Cycle Stages % T1 Buds 1% 1% 0% 1% 0% 40% 2% 0% 0% 5%
% T2 Buds 0% 1% 0% 1% 0% 29% 10% 11% 9% 13%
% T3 Buds 8% 12% 10% 18% 0% 23% 16% 33% 19% 28%
% T4 Buds 23% 21% 44% 44% 25% 8% 35% 36% 36% 31%
% T5 Buds 52% 59% 46% 21% 74% 0% 34% 19% 35% 22%
Bloom 6% 1% 0% 13% 0% 0% 3% 1% 0% 0%
Prune Cycle Emerged Shoot # 4.3 9.2 14.5 1.0 0.2 1.7 6.0 2.0 3.2
Week 6 5/17/21 to 5/21/21 Crop Cycle Stages % T1 Buds 0% 0% 0% 0% 0% 6% 0% 0% 0% 0%
% T2 Buds 0% 0% 0% 0% 0% 10% 0% 0% 0% 4%
% T3 Buds 0% 0% 0% 0% 0% 39% 2% 3% 2% 10%
% T4 Buds 0% 0% 0% 0% 0% 31% 24% 34% 11% 27%
% T5 Buds 38% 56% 18% 18% 35% 14% 28% 43% 32% 38%
Bloom 51% 41% 80% 0% 59% 0% 46% 20% 54% 22%
Prune Cycle Emerged Shoot # 1.0 0.0 13.7 11.8 8.2 2.5 3.3 6.5 3.3 4.7
Week 7 5/24/21 to 5/28/21 Crop Cycle Stages % T1 Buds 0% 0% 0% 0% 0%
% T2 Buds 0% 0% 0% 0% 0% 7%
% T3 Buds 0% 0% 0% 0% 0%
% T4 Buds 0% 0% 0% 0% 0% 2%
% T5 Buds 0% 0% 0% 0% 0% 52% 1% 11% 8% 19%
Bloom 0% 0% 0% 0% 0% 39% 99% 89% 92% 81%
Closed Flowers 37% 35% 43% 46% 39%
Open Flowers 4% 10% 5% 28% 5% 87% 48% 56% 58% 57%
Pin Heads 56% 53% 50% 21% 53% 13% 52% 44% 42% 43%
Green Fruit 3% 1% 1% 6% 4% 0%
Prune Cycle Emerged Shoot # 2.7 0.0 12.5 13.5 9.8 8.2 8.8 10.3 4.3 6.2
Week 8 5/31/21 to 6/04/21 Crop Cycle Stages % T1 Buds 0% 0% 0% 0% 0%
% T2 Buds 0% 0% 0% 0% 0% Present
% T3 Buds 0% 0% 0% 0% 0%
% T4 Buds 0% 0% 0% 0% 0%
% T5 Buds 0% 0% 0% 0% 0% Present Present
Bloom 3% 5% 10% 34% 7% 44% 11% 22% 16% 30%
Closed Flowers 3% 4% 10% 29% 6% 32% 9% 17% 16% 23%
Open Flowers 0% 0% 0% 6% 1% 11% 1% 4% 0% 7%
Pin Heads 66% 78% 82% 54% 76% 56% 87% 74% 84% 60%
Green Fruit 31% 17% 8% 12% 16% 0% 2% 4% 10%
Prune Cycle Emerged Shoot # 4.3 5.0 16.7 7.3 9.7 10.0 11.3 4.7 7.0

 

Locations: Warren Hope Searsport Sedgwick Ellsworth Deblois Montegail Jonesboro Wesley Marion
Week 9 6/07/21 to 6/11/21 Crop Cycle Stages Bloom 0% 0% 0% 2% 0% 5% 1% 2% 0% 3%
Closed Flowers 0% 0% 0% 2% 0% 3% 1% 2% 0% 3%
Open Flowers 0% 0% 0% 0% 0% 2% 0% 0% 0% 0%
Pin Heads 33% 49% 38% 63% 44% 55% 46% 69% 59% 46%
Green Fruit 67% 51% 62% 35% 56% 40% 54% 29% 41% 51%
Prune Cycle Emerged Shoot # 12.2 7.8 13.2 16.3 17.2 10.7 10.7 11.7 10.8 8.5
Week 10 6/14/21 to 6/18/21 Crop Cycle Pin Heads 13% 30% 38% 23% 13% 29% 38% 24% 14%
Green Fruit 87% 70% 62% 77% 87% 71% 62% 76% 86%
Prune Cycle Emerged Shoot # 13.7 8.2 13.5 19.5

**The average number of emerged shoots are per 1 linear foot (#/1′), averaged across multiple clones per location.
*Bud percentages are based on the total number of buds sampled at each site.
Winterkill data were sampled prior to week 1.