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Growing Fruit Trees in the Home Garden
Chuck Ingels
UC Cooperative Extension, Sacramento County
Master Gardener Training – Napa
Feb. 11, 2014
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Topics to be Covered
Fruit Tree Basics
Planting
Fruit Tree Growth
Training and Pruning
Irrigation and Fertilization
Fruit Thinning
Growing Citrus
Pest Management
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Topics to be Covered
Fruit Tree Basics
Planting
Fruit Tree Growth
Training and Pruning
Irrigation and Fertilization
Fruit Thinning
Growing Citrus
Pest Management
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Chilling Requirement
The number of hours below 45°F required by a
fruit species or variety between November 1
and February 15
Lack of chilling causes:
Death of buds, extended bloom, and poor fruit set
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Three zones with low-chill winters
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Chilling Hour Requirements (Newer varieties may have lower requirements)
Almond 250-500
Apple* 500-1000
Apple (low chill) 400-600
Apricot* 300-800
Cherry, sweet 700-800
Fig 100
Peach/nectarine 500-800
Pear* 700-800
Pear (Asian) 350-450
Pecan 250
Persimmon 100-200
Pistachio 800
Plum, European 600-800
Plum, Japanese 700-800
Pomegranate 100-150
Walnut 500-700
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Site Selection
6-8+ hours of full sun
Shelter from high winds
Avoid planting where fruit falls on walks
or driveway
Soil should be at least 3 ft deep, but
trees can be managed in shallower soil
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Pollination of Fruit Trees
• Pollenizer: A tree of one variety used to
provide pollen to a nearby tree of a
different variety to produce fruit
• Pollinator: An insect (usually a bee) that
carries pollen from one tree or flower to
another
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What if You Have No Pollinizer Nearby? Plant, Graft, or:
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Topics to be Covered
Fruit Tree Basics
Planting
Fruit Tree Growth
Training and Pruning
Irrigation and Fertilization
Fruit Thinning
Growing Citrus
Pest Management
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Soil Amendments
• Rototill compost in planting area
• No amendments in planting hole
• Uncomposted amendments rototilled
months before planting
• Avoid pockets of undecomposed organic
matter in heavy soils
• Add mulch or compost to surface
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Choosing and Handling Trees
• Bare root cheaper than potted
• Use ½ to 5/8 in. caliper trees
• Avoid drying of bare roots
• “Heel in” bare root trees if planting is
delayed
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Heeling in
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Planting Fruit Trees
• Check roots, cut off dead or damaged
• Hole size: Wide, and deep if compacted
• Plant on mound to keep crown dry
• Plant high! – Reduces chances of crown
& root rot
Graft union well above soil
Previous soil line at or above soil level
Allow for soil settling
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Undercutting the Trees
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Planting a Bare Root Tree
Dig hole to fit roots
Lightly tamp soil
Emitters 1 ft. away
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Planting a Containerized Tree
Pull out wound roots
Don’t cover soil in pot
Water in
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Post-Planting Care
• Head tree at 18-36 in. (bare root only)
• Cut back well-placed laterals to 3-8 in.,
remove all others
• Paint trunk white
Interior latex paint & water, 50:50
Entire trunk & 2 in. below soil
Prevents sunburn & borers
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Pruning a Bare-Root Tree
Branches thicker than 3/16
Branches thinner than 3/16
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New Shoots on Branches of Newly Planted Tree
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Paint Trunks White (Hot Climates, Afternoon Sun on Trunk)
To prevent this
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Topics to be Covered
Fruit Tree Basics
Planting
Fruit Tree Growth
Training and Pruning
Irrigation and Fertilization
Fruit Thinning
Growing Citrus
Pest Management
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Fruit Tree Terms
• Rootstock/Stock – tree below graft union
• Scion – above union; bud or shoot grafted
• Crown: trunk below ground (also canopy)
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Semi-Dwarf vs. Genetic Dwarf
• Standard: 20-25+ ft.
• Semi-dwarf (dwarfing rootstock): 12-20 ft.
Variable dwarfing
• Genetic dwarf (std. rootstock): 8-12 ft.
Available in apricot, apple, olive, peach, nectarine,
pomegranate
Selection of varieties is limited
Not available in citrus, fig, pear, persimmon, plum/
pluot
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Genetic Dwarf Peach/Nect.
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Standard Peach Genetic Dwarf Peach
INTERNODE LENGTH
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More Fruit Tree Terms
• Scaffold branch: main structural limb
• Spur: short fruiting twig
• Shoot: current season elongated growth
•Water sprout: vigorous shoot from
branch
• Sucker: shoot from
rootstock or roots
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Spurs
Cherry
A. pear Eur. pear
Apricot
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Peach Fruiting Branches
Flower
buds
Veg.
bud
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Heading Cut
• Removal of part of branch or shoot
• Used to promote branch development,
especially on young trees
• Stimulates growth just below cuts
• Can reduce sunlight penetration
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Thinning Cut
• Removal of entire branch
or shoot, or back to a
branch >1/3 the thickness
of cut branch
• Used to prevent crowding
and improve sunlight
penetration
• Defines main branches
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Summer Pruning of Young Trees
•Purpose: promote scaffold branches
•Head unwanted shoots to 4-6 in.
•Pinch 2 ft. long shoots to promote side
branching if necessary
•Reduces training time, shortens time to
first fruit production
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Summer Pruning for Training (Open Center)
Before After
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• Purpose: To increase sunlight &
productivity of lower fruiting wood
• Remove unwanted vigorous, upright
shoots 1-2 times during season
• Bring down tree height
• Large branches may sunburn if
pruning is excessive
Summer Pruning of Mature Trees
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Summer Pruning (Plum)
Before
After
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Prune Apricots and Cherries in August to Avoid Branch Diseases
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Specific Fruit & Nut Tree Training Methods
•Open center
•Central leader
•Modified central leader
•Perpendicular “V”
• Fruit bush
•Espalier
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Open Center
• Most common method
• Stone fruits and almonds; can
also use for apples, pears,
figs
• Select scaffolds during first 2 growing
seasons, touch up in dormant season
• Keep center open during summer from the
start
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Pruning a One-Year-Old Peach
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Pruning a Two-Year-Old Peach
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Pruning a Mature Peach
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Tying Open Center Peach Tree
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Removing Old Fruiting Wood
Cut back 2-year-old branches to
healthy 1-year-old branches
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Specific Fruit & Nut Tree Training Methods
•Open center
•Central leader
•Modified central leader
•Perpendicular “V”
• Fruit bush
•Espalier
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Central Leader Apple (Genetic Dwarf, planted 2000)
2004 2013
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• Used for apples, pears, Asian pears
•Maintain leader, remove at certain height
• Tie or stake lateral branches outward
• Create 3-4 whorls of branches
• Branches offset from those below
Central Leader Training
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Central Leader Training
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Spread branches, keep leader dominant
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Persimmon (FOHC) Central Leader
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Specific Fruit & Nut Tree Training Methods
•Open center
•Central leader
•Modified central leader
•Perpendicular “V”
• Fruit bush
•Espalier
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Fruit Bushes Kept at Desired Height
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Fruit Bushes Pruning – Years 1 & 2
• At planting, head trees to 18-24 in.
•Mid-spring – cut back new growth by half
•Mid-summer – cut subsequent growth
back by half
• Thinning cuts for sunlight penetration
•May need to prune 1-2 more times
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Cutting New Shoots in Half Mid-Summer
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Fruit Bushes Pruning Mature Trees
•Cut back new growth above selected
tree height 2-3 times during growing
season
• Thinning cuts for sunlight penetration
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Mature Fruit Bush Maintaining Tree Height
After Before
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Cherry, Pome Fruits
Ideal for Fruit Bush
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Apricot, Plum/Pluot Fruit Bushes Vigorous Growth – Extra Work
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Before After
Apricot, Plum/Pluot Fruit Bushes Vigorous Growth
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Fruit Bushes
• Advantages
Tree maintenance without ladder
Trees for small spaces
Sequential ripening
• Disadvantages
Less fruit
No shade
Timing of pruning critical
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Key Summer Pruning Missed
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Excess Shading Loss of lower branches
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Specific Fruit & Nut Tree Training Methods
•Open center
•Central leader
•Modified central leader
•Perpendicular “V”
• Fruit bush
•Espalier
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Espalier Angle Shoots Upward Initially
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Espalier Pruning Growing Season
Source: Pruning and Training (Amer. Hort. Soc.)
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Dormant Pruning
Before
After
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Espalier Menorah Shape
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Dwarf Citrus Espalier (Mandarin)
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Espalier Ensure Adequate Sunlight
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Espalier Peach
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Pruning Odd or Overgrown Trees
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Peach
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Peach No flower buds below 7-8 ft.
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Apple Fruit bent branches
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Pear
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Persimmon Before
Poor scaffold
branch
structure
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Persimmon Before After
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Persimmon Before After
Stake
upright
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Methods of Reducing Height of Large Trees
1. Cut to desired height in thirds over 3 years
Thin upright shoots in summer to
provide light for lower fruiting wood
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Pruning Overgrown Apple
What else can be done?
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Methods of Reducing Height of Large Trees
1. Cut to desired height in thirds over 3 years
Thin upright shoots in summer to provide light for lower fruiting wood
2. Bring down height in one year
Saw off limbs well below desired height
Leave one “nurse” limb to feed roots
Thin new shoots, train tree as desired
Paint exposed limbs white
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Pruning Overgrown Apple – One Year
1999
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1999
2012
2012
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Topics to be Covered
Fruit Tree Basics
Planting
Fruit Tree Growth
Training and Pruning
Irrigation and Fertilization
Fruit Thinning
Growing Citrus
Pest Management
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Irrigation
•Best = drip and microsprinkler irrigation
•Also, furrow, doughnut ring, sprinkler
•Worst = in a lawn
•Water should reach at least 2 ft. deep
•A 2-year-old tree can use about 2
gal./day
•A mature tree can use >50 gal./day
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Drip Irrigation
Mulch pulled back
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Second Drip Line Added (Inline emitter tubing)
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Microsprinkler
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•Don’t overfertilize! Little N required.
•Use no more than 1 lb. actual N per
year on mature trees
• Too much N excessive growth,
shading of lower wood
•Other nutrients usually sufficient
•Use organic amendments
Fertilization
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Topics to be Covered
Fruit Tree Basics
Planting
Fruit Tree Growth
Training and Pruning
Irrigation and Fertilization
Fruit Thinning
Growing Citrus
Pest Management
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Fruit Thinning
Before
After
Harvest
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Reasons for Fruit Thinning
• Increases fruit size
• Improves fruit color
• Reduces diseases (esp. brown rot)
• Reduces alternate bearing
• Reduces limb breakage
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Methods of Fruit Thinning
• Hand thinning
Most thorough but time consuming
Selectively eliminate small, damaged fruit
• Pole thinning
Short hose piece on mop handle
Quick, but not selective
May damage fruit
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Fruit Thinning Timing and Spacing
• Timing: ¾ to 1 in. dia. (late April-early May)
• Spacing
Depends on tree vigor
Fruit should not touch at harvest
Peaches: 5-6 in. Apricots: 4-5 in.
Apples: Thin to 1 fruit per cluster or 6 in.
Pears: Thin to 1 fruit/cluster (Bartlett – no
thinning)
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Topics to be Covered
Fruit Tree Basics
Planting
Fruit Tree Growth
Training and Pruning
Irrigation and Fertilization
Fruit Thinning
Growing Citrus
Pest Management
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Growing Citrus
Several slides provided by Bill Krycia, UC Maser Gardener
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UC Publication 8472
“Tried and True or Something New?”
http://anrcatalog.ucdavis.edu/pdf/8472.pdf
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Citrus Types
• Standard – to 20 or more feet!
• Dwarf – to 6-10 ft.
• Good variety selection in dwarf
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Rootstocks and Tree Size
Dwarf (Flying Dragon, Rich 16-6)
» Tree size 1/3 to 1/2 of full size
–6’ to 8’ for large trees
–4’ to 6’ for kumquats, smaller citrus Semi-Dwarf (C-35, trifoliate)
» Tree size about 3/4 of full size
–15’ Full Size (Carrizo, others)
» 20’+
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Cold air drainage
»Plant preferably not in the lowest spot
»Plant upslope on a south facing slope
Preferred Areas
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Soil Considerations
•Roots are shallow (1-2 ft.)
•Good drainage essential
•Avoid heavy clay soils
•Raised beds or containers if
soil is poor
•Provide plenty of water
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Citrus Have Shallow Roots
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Evaluate drainage
Consider raised bed or berm
Adequate space
Best time, March & April
» Allows trees some time to establish
before the heat and the cold
Planting
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Portable
Containers as accents
Opens new areas
Growing Citrus Trees in Containers
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Size of container
» 16” or larger (half barrel is fine)
Soil
» Various potting soil mixes, balance
between water retention and drainage
Drainage
» Multiple drainage holes (covered with
hardware cloth to minimize soil loss)
Growing Citrus Trees in Containers
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Avoid saucer unless you create air gap
» Don’t want to keep roots soaked in water
If placed on ground
» Consider creating air gap under pot to
prevent roots from entering soil
Growing Citrus Trees in Containers
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Photos: Dan Vierria
Growing Citrus Trees in Containers Repotting
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Photos: Dan Vierria
Growing Citrus Trees in Containers Repotting
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Non-bearing trees
» Small amount every 3-4 weeks
Older (bearing) trees
» 1 lb. actual N/tree/year, 2-3 applications
Organic fertilizers last longer
Citrus Fertilization In Ground
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Rule of thumb: ½ the recommended
concentration in ½ the recommended
interval
Consider slow release or organic N
Nutrients leach out of container
Citrus Fertilization Containers
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Citrus Pruning
• Little required – control size, shape, & suckers
• Timing – early spring after frost is best
• Usually thinning cuts
• Thin out strong upright shoots
• Keep “skirts” pruned up off ground
• Older trees respond well to shearing or rejuvenative pruning
• Whitewash exposed limbs to prevent sunburn
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2-Year-Old trees: Little Pruning
Branches floppy when young. Those bending down help
develop mounding canopy common on older trees.
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Branches may shoot out at
odd angles. Keep them;
they’ll bend over too
Fruit weight
will tame them
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Not much
needed once
trees are
mature
Prune mainly
for size control
and ease of
picking
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Branches pruned
off the ground
–Reduces fruit rot
–Makes weed control easier
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Watch for Rootstock Suckers
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Exclude ants
with Tanglefoot
–They protect
scales from
parasitoids
Pest Management
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Frost Protection
Select less sensitive varieties
Plant on slopes
Plant in containers and move/cover
Water!
Lights/permeable barriers
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Scale of frost sensitivity:
Fruits not as hardy as the plant
Damage is a function of and duration
Citrus Cold Hardiness
Citron, damage at 32F
Lime
Lemon
Grapefruit / pummelo
Orange / Tangelo
Mandarin / Meyer lemon
Kumquat
Yuzu, OK down to 17°F
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Frost Protection
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Lemon Tree
12/10/2013
12/14/2013
12/26/2013
1/30/2014
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Mandarin Tree
12/10/2013
1/30/2013
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“Holiday” Tree Lights for Warmth (not L.E.D.)
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Asian Citrus Psyllid and Citrus Greening (Huanglongbing)
HLB = Fatal citrus disease transmitted
by Asian citrus psyllid (ACP)
ACP spread throughout So. Calif.
» Active quarantines in other parts of Calif.
» New finds in So. San Joaquin Valley
Only 1 known infected tree in Calif.
» Hacienda Heights, 3/30/12, are likely more
Destroying Florida citrus
Currently no known cure
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Topics to be Covered
Fruit Tree Basics
Planting
Fruit Tree Growth
Training and Pruning
Irrigation and Fertilization
Fruit Thinning
Growing Citrus
Pest Management
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Codling Moth
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Eggs and newly
hatched larva
Pupating
larvae
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Codling Moth Characteristics
• Pest of apple, pear, quince, walnut
• Overwinter as larva in cocoon
• Mating begins during or just after
flowering (temp. dependent)
• 2-4 generations per year
• Extremely difficult to control
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Codling Moth Control Methods
• Take what you get, cut damage out
• Remove/destroy infested fruit early
• Bag individual fruits
• Mass trapping of males
• Organic products: Hort. oil, granulosis virus (Cyd-X), spinosad, kaolin clay (Surround)
• Chemical: Sevin (kills beneficials!)
• Good coverage is essential
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Pheromone Trap
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Pacific Flatheaded
Borer
Adult
Larva
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Shothole Borer
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Borers
•Control methods:
»Keep trees healthy
»Prevent sunburn!
–Paint new trees and exposed branches white
–Proper dormant & summer pruning
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SWD Damage (Maggots) Cherry
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female
male
Spotted Wing Drosophila Mostly cherries; also berries & other fruits
Native to Asia
Found in Calif. in 2009
Now endemic
Infest mature and rotting
fruit
Overwinter as adults
Active throughout the year
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D. simulans/
melanogaster
D. suzukii
Unique Ovipositor
Photos by Martin Hauser,
CDFA
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Gardeners have only Malathion
and spinosad
Begin spraying at fruit color
change (straw/pink in cherries)
»No need to spray green fruit
»Spray before fruit softening
Insecticides
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Exclusion Fair Oaks Horticulture Center
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Fire Blight
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Bark/
cambium
damage
Shoot
dieback
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Fire Blight Characteristics
•Bacteria – enters through flowers
under warm, moist conditions
•Affects apple, pear (esp. Bartlett),
Asian pear, flowering pear, quince,
loquat, pyracantha, hawthorne
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Fire Blight Control Methods
• Cut shoot or branch 12 in. below
infection zone
»Sterilize shears between cuts
(20% solution of bleach)
• Spray copper product twice during
bloom
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Peach Leaf Curl
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Peach Leaf Curl
• Affects peaches, nectarines
• Fungal diseases spread by rain, wind
• Spores overwinter in buds and twigs
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Control of Peach Leaf Curl
• Lime sulfur, Microcop no longer available
• Copper sprays
Tribasic or basic copper sulfate (hard to find)
Copper ammonium complex (e.g., Liqui-Cop)
Copper soap (e.g., Concern)
1. Early Dec.
2. In Feb. as flower buds swell
• Consider covering trees
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2012 Peach Leaf Curl Trial Treatments and Timings
Product Rate/Gal. Timing(s)
Lime sulfur -
Microcop
1 cup
2 1/3 Tbsp.
Dec. 4
Feb. 11
Copper soap 2 fl. oz. (+ oil) Dec. 4, Feb. 11
Liquicop 1 fl. oz. (+ oil) Dec. 4, Feb. 11
Agribon (fabric) AG-30,
doubled
Before rains
Agribon +
Liquicop
Same as
above
Dec. 4, Feb. 11
Maxicrop (kelp
extract)
1.7 oz. Feb. 20
Mar. 2, 8, 12, 15, 26,
28
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Individual Branches Treated
Sprayed individual branches
Agribon on branch at home
Untreated Lime sulfur – Microcop
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• Lime sulfur (late fall) and Microcop (late winter)
was very effective in reducing severity
• Agribon + Liquicop was at least as effective as
lime sulfur - Microcop
• Copper soap, Liquicop, and Agribon were
somewhat less effective than lime sulfur/ Microcop,
but still provided 60-80% control compared to
untreated branches
• Maxicrop vs. untreated (not shown): Nearly equal
incidence in all 4 varieties tested, and Maxicrop
increased severity in 3 of the 4 varieties
2012 Peach Leaf Curl Trial Conclusions
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Brown Marmorated Stink Bug (Halyomorpha halys)
Photos: Baldo Villegas
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Native to East Asia (China, Japan, Korea,
Taiwan)
A crop pest in its native range and here
Household nuisance pest in fall, winter
Host list currently 170 spp., likely to rise
Brown Marmorated Stink Bug (Halyomorpha halys)
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Source - http://www.stopbmsb.org
T. Leskey, USDA-ARS May, 2012
Current distribution in USA
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BMSB Finds in
California
Source - CDFA Plant Health and Pest
Prevention Services Database, 2010
Also:
Butte
Monterey
Yolo
San Luis Obispo
Siskiyou
Sutter
Alameda
Los Angeles
Riverside
Sacramento
San Diego
San Francisco
San Joaquin
Solano
Santa Clara
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Oct. 15, 2013
BMSB Finds in Sacramento County
Jan. 1, 2014
cesacramento.ucanr.edu
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Two white bands
on antennae
Smooth
“shoulder” edges
Banded
abdominal edge
extending
beyond wings
Actual adult size
1/2 to 5/8 inch
Rust color with
broad brown
markings
Banded legs Mature nymph (5th instar)
Adult
Photo: UC IPM
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Eggs (20-30) & nymphs
Nymph (3rd of 5) Adult
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Some Other True Bugs
Consperse stink bug
Red shouldered stink bugs Rough stink bug
BMSB
Photos:
UC IPM
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Host Plants Crops
Stone fruits (esp. peach), pome fruits,
citrus, persimmon, fig
Berries
Grapes (not a major host)
Eggplant, tomato, okra, pepper, corn,
beans (esp. soy), cucurbits, sunflower
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Host Plants Selected Ornamentals
Catalpa
Chinese pistache
Elm
Maple
Holly
Mulberry
Princess tree
(Paulownia)
Pyracantha
Redbud
Rose
Southern magnolia
Tree-of-heaven
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BMSB Damage
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Adult Aggregation
Late summer/fall – adults seek overwinter
sites in houses, under eaves, in leaf litter
Annoys residents, odor when disturbed
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BMSB An Arboreal Species
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Aggregation Season, Pennsylvania
Photos:
Tracy Leskey
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Aggregation Behavior
Photos:
Tracy Leskey
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Questions? https://cesacramento.ucanr.edu