2021 Phenological Staging Data
2021 Wild Blueberry Phenology Record
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 5/03/21 to 5/07/21 | 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 5/10/21 to 5/14/21 | 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 | |
| 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 | – | – | – | – | – | – | |
| Week 11 6/21/21 to 6/25/21 | Crop Cycle Stages | Pin Heads | 8% | 12% | 12% | 31% | 7% | 6% | 26% | 29% | 14% | 13% |
| Green Fruit | 90% | 87% | 86% | 68% | 93% | 94% | 70% | 70% | 80% | 82% | ||
| Red Fruit | 1% | 0% | 0% | 1% | 0% | 0% | 0% | 0% | 0% | 0% | ||
| Blue Fruit | 1% | 0% | 1% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | ||
| Prune Cycle | Emerged Shoot # | 18.2 | 12.7 | 15.0 | 22.5 | 15.8 | 10.7 | 11.2 | 11.7 | 10.8 | 9.0 | |
| % Tip Die Back | 17% | 15% | 14% | 46% | 25% | 4% | 12% | 5% | 9% | 16% | ||
| Week 12 6/28/21 to 7/02/21 | Crop Cycle Stages | Pin Heads | 4% | 14% | 13% | 26% | 8% | 3% | 25% | 29% | 14% | 13% |
| Green Fruit | 80% | 75% | 80% | 66% | 78% | 97% | 72% | 68% | 76% | 83% | ||
| Red Fruit | 7% | 3% | 2% | 2% | 4% | 0% | 0% | 1% | 3% | 0% | ||
| Blue Fruit | 9% | 8% | 5% | 6% | 9% | 0% | 2% | 1% | 4% | 0% | ||
| Prune Cycle | Emerged Shoot # | 20.0 | 15.2 | 16.2 | 20.3 | 17.5 | 11.2 | 11.2 | 11.7 | 10.8 | 9.2 | |
| % Tip Die Back | 45% | 28% | 35% | 41% | 33% | 1% | 6% | 7% | 9% | 24% | ||
| Week 13 7/05/21 to 7/09/21 | Crop Cycle Stages | Pin Heads | 2% | 10% | 8% | 21% | 7% | 1% | 20% | 23% | 11% | 13% |
| Green Fruit | 68% | 63% | 64% | 57% | 64% | 95% | 64% | 61% | 50% | 77% | ||
| Red Fruit | 5% | 6% | 13% | 4% | 6% | 3% | 5% | 2% | 8% | 3% | ||
| Blue Fruit | 26% | 20% | 15% | 18% | 23% | 2% | 11% | 14% | 30% | 7% | ||
| Prune Cycle | Emerged Shoot # | 21.7 | 15.0 | 18.0 | 21.8 | 19.8 | 11.2 | 11.2 | 11.7 | 11.0 | 9.7 | |
| % Tip Die Back | 78% | 54% | 41% | 81% | 86% | 14% | 7% | 3% | 9% | 16% | ||
| Week 14 7/12/21 to 7/16/21 | Crop Cycle Stages | Pin Heads | 3% | 6% | 2% | 4% | 19% | 21% | 9% | 9% | ||
| Green Fruit | 43% | 34% | 43% | 30% | 56% | 55% | 34% | 61% | ||||
| Red Fruit | 12% | 12% | 5% | 4% | 6% | 7% | 7% | 9% | ||||
| Blue Fruit | 44% | 46% | 50% | 62% | 38% | 37% | 57% | 30% | ||||
| Unmarketable Fruit | 1% | 8% | 2% | 3% | 0% | 1% | 2% | 0% | ||||
| Prune Cycle | Emerged Shoot # | 19.0 | 13.7 | 16.3 | 19.0 | 17.2 | 12.2 | 12.3 | 11.2 | 9.7 | ||
| % Tip Die Back | 62% | 58% | 95% | 95% | 94% | 10% | 16% | 12% | 15% | |||
| Week 15 7/19/21 to 7/23/21 | Crop Cycle Stages | Pin Heads | 0% | 9% | 9% | 17% | 4% | 1% | 21% | 15% | 8% | 8% |
| Green Fruit | 12% | 17% | 27% | 22% | 8% | 52% | 41% | 26% | 20% | 48% | ||
| Red Fruit | 4% | 2% | 3% | 5% | 3% | 4% | 2% | 5% | 10% | 6% | ||
| Blue Fruit | 76% | 75% | 68% | 72% | 79% | 44% | 56% | 64% | 70% | 45% | ||
| Unmarketable Fruit | 7% | 5% | 1% | 1% | 9% | 0% | 0% | 5% | 0% | 1% | ||
| Prune Cycle | Emerged Shoot # | 16.3 | 14.8 | 15.7 | 15.8 | 16.2 | 12.2 | 11.7 | 15.0 | 11.2 | 10.0 | |
| % Tip Die Back | 87% | 79% | 84% | 97% | 95% | 9% | 5% | 85% | 12% | 15% | ||
| % Bud # | 3% | 9% | 17% | 62% | 17% | 0% | 0% | 13% | 0% | 0% | ||
| Week 16 7/26/21 to 7/30/21 | Crop Cycle Stages | Pin Heads | Harvested | 6% | 10% | 18% | 3% | Harvested | 10% | 7% | Harvested | 3% |
| Green Fruit | 4% | 20% | 9% | 4% | 31% | 19% | 31% | |||||
| Red Fruit | 2% | 2% | 4% | 3% | 6% | 1% | 4% | |||||
| Blue Fruit | 81% | 72% | 86% | 87% | 63% | 79% | 64% | |||||
| Unmarketable Fruit | 13% | 5% | 0% | 6% | 0% | 1% | 1% | |||||
| Prune Cycle | Emerged Shoot # | 17.8 | 15.7 | 16.0 | 15.8 | 16.8 | 12.3 | 12.2 | 12.3 | 11.7 | 10.7 | |
| % Tip Die Back | 98% | 80% | 92% | 94% | 90% | 15% | 5% | 4% | 1% | 3% | ||
| % Bud # | 16% | 13% | 32% | 91% | 70% | 0% | 19% | 20% | 35% | 17% | ||
**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.
| Locations | Warren | Hope | Searsport | Blue Hill | Ellsworth | Deblois | Montegail | Jonesboro | Wesley | Marion | ||
| Week 17 8/02/21 to 8/06/21 | Prune Cycle | Average Bud # | 0.69 | 1.61 | 1.39 | – | 1.25 | 0.89 | 0.67 | 0.92 | 0.83 | 0.44 |
| Green Buds (%) | 92% | 97% | 74% | – | 100% | 91% | 96% | 94% | 100% | 100% | ||
| Brown Buds (%) | 8% | 3% | 26% | – | 0% | 9% | 4% | 6% | 0% | 0% | ||
| Week 18 8/09/21 to 8/13/21 | Prune Cycle | Average Bud # | 1.00 | 2.03 | #DIV/0! | 2.10 | 2.00 | 0.75 | 0.53 | 1.33 | 1.11 | 0.61 |
| Green Buds (%) | 89% | 93% | #DIV/0! | 59% | 75% | 81% | 100% | 94% | 100% | 64% | ||
| Brown Buds (%) | 11% | 7% | #DIV/0! | 41% | 25% | 19% | 0% | 6% | 0% | 36% | ||
| Week 19 8/16/21 to 8/20/21 | Prune Cycle | Average Bud # | 0.94 | 2.49 | 1.86 | 1.92 | 2.22 | 0.64 | 0.74 | 1.11 | 0.81 | 0.44 |
| Green Buds (%) | 85% | 67% | 78% | 25% | 63% | 57% | 78% | 65% | 86% | 100% | ||
| Brown Buds (%) | 15% | 33% | 22% | 75% | 38% | 43% | 22% | 35% | 14% | 0% | ||