Regional Almond Day Madera County

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Regional Almond Day Madera County Leaffooted
Bugs in Almonds Biology and Management Kent
Daane, Glenn Yokota, DeAnna Romero, and David
Haviland UC Berkeley UC CE Kern Tulare Counties
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Seasonal period LFB stage causing
damage Overwintering stages Winter
aggregations Winter temperatures 2008 predictions?
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LFB damage in 2006 - Overwintering
What about LFB damage in 2008?
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LFB damage previous cage studies

• 7-day feeding periods
• different seasonal periods
• different almond cultivars
• rated types of damage

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RESULTS of DAMAGE March-April

• significant nut drop
• no harvest difference
• LFB population levels ?

100
80
60
Drooped Nuts ()
40
20
0
Controls
Caged LFB 7 days March-April
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Overwintering adults and offspring
J F M A M J J A S O N D
What is the season-long damage from offspring?
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April-May 1-7 nut damage
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June-July 0-3 nut damage
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RESULTS 3 Generations / year!
J F M A M J J A S O N D
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What stages overwinter?
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LFBs survival Development stages?
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Adult LFB winter survival
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LFB populations build on other hosts
Spring 2006 had large migrating population
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Leaffooted Bug Adult wing-span
Photo web
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Field monitoring of winter populations
We predicted a low moderate 2007 LFB population
Photo GY Yokota
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Overwintering Aggregations

• Reasons
• Shelter
• Food volatiles
• Pheromone
• Temperature

• Controls
• Sampling
• Attract kill
• Locate kill

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Aggregation formation
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need a pheromone chemist
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LFB in spring 2008 Predictions?
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1) Mild fall temperatures more adults
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2) Large aggregations found In 3 acres olives,
gt1000 aggregations ranging from 5-300 LFB each
Leaffooted Bug Egg hatch
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Final Comments Monitoring Control

• Monitoring
• Shelters (tarp)
• Neighboring sites
• Spring nut drop

• Controls
• April and May
• Lorsban long residual, disruptive
• Permethrins shorter residual, new products
• Adults move quickly, strong fliers