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Stages of Bud Break in Chestnut

Stages of Bud Break in Chestnut. Stacy Clark 1 , Leila Pinchot 2 , Scott Schlarbaum 2 , and Fred Hebard 3. 1 U.S Forest Service, 2431 Joe Johnson Dr., Rm 247, Knoxville, TN 37996-4563 2 University of Tennessee, 274 Ellington Plant Science Building, Knoxville, TN 37996

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Stages of Bud Break in Chestnut

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  1. Stages of Bud Break in Chestnut Stacy Clark1, Leila Pinchot2, Scott Schlarbaum2, and Fred Hebard3 1U.S Forest Service, 2431 Joe Johnson Dr., Rm 247, Knoxville, TN 37996-4563 2University of Tennessee, 274 Ellington Plant Science Building, Knoxville, TN 37996 3American Chestnut Foundation, 29010 Hawthorn Dr., Meadowview, VA 24361

  2. Bud break is assessed using a 0.0 ranking system (adapted from West and Wein 1971). • 0-Bud dormant, no sign of breaking • 1-Bud displays silver/green tip • 2-Bud green, but tight, no leaves unfolding • 3-Bud expanding, leaves unfolding from bud • 4-Internodes visible, leaves not enlarging • 5-Internodes visible, leaves enlarging The number to the left of the decimal denotes the most advanced phenological bud break that is occurring on the tree according to these categories:

  3. Bud break is assessed using a 0.0 ranking system (adapted from West and Wein 1971). The number to the right of the decimal indicates the percentage of buds on the seedling (to the nearest 10%) that have developed to or past this stage. Example: a seedling with terminal at stage 3 with 50% of the buds to this stage would receive ranking of 3.5. The phenological stage of the tree’s terminal bud should also be noted separately (or in the case of dieback or deer brose, the uppermost bud). • West, N.E. and R.W. Wein. 1971. A plant phenological index technique. BioScience 21(3): 116-117.

  4. Rank 0.10 Buds dormant, no sign of breaking

  5. Rank 1.10 Buds display silver/green tip

  6. Rank 2.10 Buds green but tight, no leaves unfolding

  7. Rank 3.5 (First bud) Bud expanding, leaves unfolding

  8. Rank 4. Internodes visible, leaves not enlarging

  9. Rank 5. Internodes visible, leaves enlarging

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