Integrated Pest Management in HopsThe Basics of IPM in Hops Integrated Pest Management • Systems...
Transcript of Integrated Pest Management in HopsThe Basics of IPM in Hops Integrated Pest Management • Systems...
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Integrated Pest
Management in HopsScott Lewins
UVM Extension
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The Basics of IPM in Hops
Integrated Pest Management
• Systems approach
• Uses complimentary tactics
• Maintains pests below “injurious” levels
• Minimizes impacts of activities
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The Basics of IPM in Hops
Available for free at:
https://www.usahops.org/cabinet/data/Field-Guide.pdf
Pest and natural
enemy identification
is crucial for success
The more you know
about pest and
natural enemy
biology the better
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The Basics of IPM in Hops
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The Basics of IPM in Hops
Chemical control as a last resort…
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Downy Mildew
• Most difficult to control
• Promoted by wet conditions
• Obligate parasite specific to hops
• Attacks leaves and cones
• In the wood of the plant(persists in crown
from year to year)
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Downy Mildew Life Cycle
Overwinters in buds and crown
In-Season Infection
Spores travel, landing on leavesPrimary basal spikes
emerge in spring
Systemic (year after year)
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Downy Mildew Resistance
ResistantFuggle
Newport
Perle
Spalter
Wye Challenger
Hallertauer Gold
Hallertauer Magnum
Hallertauer Tradition
Comet
Crystal
East Kent Golding
First Gold
Glacier
Horizon
Cluster
Northern Brewer
Susceptible
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Downy Mildew Management
Crowning: removes first growthLimits plant area for primary
innoculum to land
Spraying Fungicide: ProtectantSpray before rain events for protection
against secondary innoculum
Moist conditions are ideal for infection: Forecasting (predict spray applications)
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Mechanical Control
• Crowning – removal top 1 to 2 inches of
crown before bud break
• Scratching – disks scratch soil and remove
buds from crown
• Pruning – removal of shoots before
training
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Whole Row Crowning Would be Better
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Preventative Fungicides
Spray fungicides on days priorto conditions that would
increase DM susceptibility
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Arthropod Pests
Japanese beetlesAphids
Two spotted
spider mites
Hop loopersEastern comma
(Hop merchant)
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Major Arthropod Pests
Two Spotted Spider Hot/dry conditions
Specialist predator
MitesCan affect quality
Secondary outbreaks
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Major Arthropod Pests
Two Spotted Spider Mites
Mite destroyer pupa
Mite destroyer larva
Mite destroyer adultTwo-spotted spider mites
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Major Arthropod Pests
Potato LeafhoppersMigrate each spring
Prefer legumes
Cause “hopper burn”
Controlled by beneficials
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Potato Leafhoppers
Major Arthropod Pests
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Major Arthropod Pests
Hop AphidsWinter host: Prunus
Cool/moist weather
Controlled by beneficials
Cause sooty mold
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Minor Arthropod Pests
Hop looper
Japanese
beetleEastern comma
(Hop merchant)
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Beneficial Insects
Parasitoid wasps
Lacewing adult
Lady beetle larvae and adults
Minute pirate bug
Lacewing egg and larva
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Spiders Spider mite destroyer
Predatory mites
Hover fly
Spined soldier bug eggs, larvae, and adult
Beneficial Insects
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Weed control
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“Scorched Earth”
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Mulch
• Expensive
– $1200 for 110 yards
of hardwood mulch
(including delivery)
– Covered ½ acre, 6”
deep, 4’ wide
• Approximately 100
woman hours saved
• Fertility trade offs?
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Sod & Cover Crops
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Flame Weeding
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Steam Weeding
http://www.youtube.com/watch?v=E71TRC
Qg5us&feature=player_embedded
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Plastic Mulch
• Good for first year
• Effective control
• Pain to pull up
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Thank You
Questions?