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Leaving 6-8 leaves on the rootstock seedling when chip-budding pawpaw may increase bud take and scion growth
The remaining rootstock leaves will provide energy for the developing scion bud, until the bud has initiated leaves and is able to photosynthesize and support its own growth
After approximately 6 weeks, the rootstock's leaves would be pruned away, leaving the new scion shoot
The objective of this study was to determine if leaving 6-8 leaves on pawpaw seedling rootstocks for 6 weeks will enhance scion bud break and growth
The experiment consisted of:
2 pawpaw scions (Sunflower and Susquehanna)
2 seedling rootstocks (Sunflower and K8-2)
2 leaf treatments (removing all leaves at time of grafting vs leaving 6-8 leaves on the grafted tree)
Dormant budwood was grafted onto actively growing 1 year old seedlings in the greenhouse in June 2006
Data was collected weekly on scion budbreak and leaf number
Rootstock shoots were removed after 6 weeks
| Pawpaw graft take percentage before being cut back - 8/25/06 | Pawpaw graft take percentage after being cut back - 9/22/06 | ||
| Scion | Scion | ||
|---|---|---|---|
| Sun | 59% | Sun | CEO |
| Sus | 70% | Sus |  |
| sig. |  | sig. | |
| RS | RS | ||
| 8-2 |  | 8-2 |  |
| Sun | Sun | ||
| sig. | sig. | ||
| Leaves | Leaves | ||
| L |  | L |  |
| NL | NL | ||
| sig. | sig. | ||
| Blocks (date grafted) | Blocks (date grafted) | ||
| 21-Jun | 53.0% | 21-Jun | 64% cd |
| 22-Jun | 69.0% | 22-Jun | 69% bcd |
| 23-Jun | 67.0% | 23-Jun | 69% bcd |
| 26-Jun | 64.0% | 26-Jun | 83% ab |
| 27-Jun | 56.0% | 27-Jun | 58% d |
| 28-Jun | 78.0% | 28-Jun | 81% abc |
| 2-Jul | 67.0% | 2-Jul | 100% a |
| sig | NS | sig | * |
Number of leaves on chip budded pawpaw scions 8/22/06 Number of leaves on chip budded pawpaw scions 9/25/06
[F4] Scion
Sun
Sus
sig.
6.1 RS
8-2
Sun
sig.
Leaves
sig.
Blocks (date grafted) Blocks (date grafted)
21-Jun 7.2 a 21-Jun 6.1 bc
22-Jun 6.7 a 22-Jun 7.8 ab
23-Jun 7.0 a 23-Jun 8.0 a
26-Jun 6.5 a 26-Jun 6.9 ab
27-Jun 6.2 ab 27-Jun 7.8 ab
28-Jun 5.3 b 28-Jun 7.4 ab
2-Jul 2.8 c 2-Jul 4.1 c
sig. ** sig. **
■ Scion cultivar did not affect chip bud take or scion leaf number
Chip buds on K8-2 rootstock had a higher percentage take than those budded onto Sunflower rootstock. There was not a significant difference in scion leaf number between rootstocks
Chip-budded pawpaws with leaves remaining on the rootstock seedling had a higher percentage bud take than chip-budded pawpaws on which the rootstock's leaves had been removed when budded
Budded pawpaw trees which had the rootstock's leaves removed when grafted had more scion leaves than trees on which rootstock leaves were retained for 6 weeks after grafting
Conclusions
While rootstock leaf retention was beneficial for graft union development, the resulting scions actually had fewer leaves.
Pawpaw chip-bud emergence improves by leaving 6-8 leaves on the rootstock to support the scion budbreak and growth.
These leaves should be removed after 6 weeks to encourage scion growth.