Louise Ferguson  UC DavisLouise Ferguson – UC Davis

The right time to select budwood and begin The right time to select budwood and begin The right time to select budwood and begin The right time to select budwood and begin buddingbudding

Follow up care after buddingFollow up care after budding See if bud dies.  Cut lower leaves.

The bud shield is cut and inserted The bud shield is cut and inserted into Tinto T‐‐cut on rootstock.cut on rootstock.

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Shield containing the vegetative bud is cut from the budstickShield containing the vegetative bud is cut from the budstick

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Late July Late July ––Early AugustEarly AugustEarly AugustEarly August

Buds mature & Buds mature & Buds mature & Buds mature & dormantdormant

Rootstock bark is Rootstock bark is slippingslipping

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Scion budwood selection:- 50 cm long- remove leaves - select buds- more pointed than flower buds- base of current year’s growth

Scion

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For T-budding:- budstick and rootstock = size- budstick and rootstock = size- 0.6 - 1.25 cm in diameter.

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Bud is removed with the shield

“T” cut is made in the rootstock.T cut is made in the rootstock.

The shield is inserted into the top of the “T” with the vegetative bud

i ti dpointing upward.

The bark on the rootstock is slipping and active.

The shield is pushed to the end of the “T” cut.

The “T” bud is wrapped to prevent movement.

B dded scion p shing o t ne lea esBudded scion pushing out new leaves.

If the first bud dies, rootstocks are

b dd d OldOldrebuddedin September.

Or rootstocks can

OldOldOr rootstocks can be doublebudded.

NeNeNewNew

When leaves emerge:- cut rootstock 15cm above the bud- tie to rootstock- do not tie only to stake

ti t t k l- tip rootstock leaves to keep rootstock growth below the bud.

As the scionAs the scion grows it is tiedto a bamboostakestake.

Allow rootstock leaves to grow b l th i thbelow the scion growth; - promotes faster growth

15 – 25 cm seedlings plantedstraight into the field, protectedwith plastic tubes

UCB clonal rootstock in GroTube- ready to be field budded

Clone micro-propagation of rootstocks

UCB clonal rootstocks in Duarte Nursery greenhouses