2021 Phenological Staging Data (ALL)
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 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% | ||