Volume 63 Number 4 Article 3
Year 2009 Month 10
Title: Enhancing Pawpaw Chip Budding Success
Authors: K.W. Pomper, S.B. Crabtree and J.D. Lowe
Abstract:
The pawpaw [Asimina triloba (L.) Dunal] is gaining popularity as a commercial tree fruit.
Pawpaw cultivars
are usually propagated by chip budding.
The objectives of this study were to determine 1) if leaving 6 to 8 leaves
on pawpaw rootstock upon chip budding improved budding success and scion growth in greenhouse-grown container
production and 2) if genetic background of the seedling rootstock or scion affected chip budding success
or scion growth.
An experiment was conducted using a three-way factorial design with six replicate blocks, with
treatments of two scions (‘Sunflower’ and ‘Susquehanna’), two seedling rootstocks (Sunflower and K8-2), and
two leaf treatments (removing leaves vs. leaving 6-8 leaves at budding). Trees were chip-budded in late June 2006.
Retaining leaves on the rootstock seedling increased scion bud break (76%) on rootstocks compared to budding
onto rootstocks with all leaves removed (54%). Removal of the remaining rootstock leaves after 6 weeks had an
additional positive effect.
After leaf removal at 6 weeks, an additional 11% of buds broke on rootstocks that had
previously retained their leaves.
Only 1% more buds broke after the 6 week point on rootstocks that had leaves
removed from the beginning.
The K8-2 seedling rootstock had a higher budding success (80%) than Sunflower
seedling rootstock (62%). Although cutting back the rootstock and removing competing leaves at the time of chip
budding would be more convenient and require less labor for nurseries, this practice cannot be recommended due
to the reduced chip budding success (55% vs. 87%).
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