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Pecan Weevil Update. Sherry Sanderson Chief Entomology and Nursery Industries Bureau New Mexico Department of Agriculture. Biology . 2-3 year life cycle Adult emerges, feeds and lays egg in gel stage of pecan nut Larvae feed on the pecan nutlet

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pecan weevil update

Pecan Weevil Update

Sherry Sanderson

Chief

Entomology and Nursery Industries Bureau

New Mexico Department of Agriculture

biology
Biology
  • 2-3 year life cycle
  • Adult emerges, feeds and lays egg in gel stage of pecan nut
  • Larvae feed on the pecan nutlet
  • Larvae drills a hole in pecan nut and drop to the ground
  • Larvae tunnels 12” to 24” inches into soil
location
Location

Pecan Weevil is found from New York to Iowa to Oklahoma, and across the southeastern states. In Texas, the weevil is found in 131 counties.

eradication efforts
Eradication Efforts
  • Emergence Monitoring
  • Insecticide Applications
  • Cold Treatment
  • Cleaning Plant Inspections
  • Import Inspections
emergence monitoring
Emergence Monitoring
  • Counties monitored
    • Dona Ana, Luna, Otero
  • Emergence traps placed in orchards and yard
    • Determine adult emergence
  • Nutlet monitoring
    • Sampled to determine stage
  • Applications were started during water stage – prior to gel stage or upon weevil capture
insecticide applications
Insecticide Applications
  • Prior to gel stage
    • Labeled rates of Fury® and/or Sevin XLR®
  • Applications
    • July/August-September
    • Every 7-10 days
    • Owner responsible for spraying
    • Contractor hired
trapping results 2003
Trapping Results 2003
  • Trapped 7 pecan weevils in infested areas
    • 6 weevils in Dona Ana County
    • 1 weevil in Otero County
  • Pecan nuts found by inspectors with pecan weevil larvae exit hole
    • 0 nuts in Dona Ana County orchard
    • 0 nuts in Luna County backyard
    • 0 nuts in Otero County orchard
cleaning plant inspections
Cleaning Plant Inspections
  • Hired 4 temporary inspectors
  • Areas inspected (# of cleaning plants inspected)
      • Pecos Valley - 15
      • Otero County - 7
      • Mesilla Valley
        • North Valley - 14
        • South Valley - 20
      • Luna County - 2
      • Sierra County - 1
  • Cleaning plants inspected twice weekly
    • November, 2002 to February, 2003
  • Inspected trash piles, seconds, etc.
harvest
Harvest
  • Pecans at infested orchards
    • Cleaned at one facility
    • Cold treatment
      • 7 days (168 hrs) at 0 degrees F
  • Cleaning Trash
    • Subjected to cold treatment prior to disposal
  • Custom Harvesting
    • Monitored all movement and cleaning of equipment
house survey
House Survey
  • Deming (houses in a 10 block (E-W & N-S)
    • 42 houses with pecan trees inspected – No evidence of pecan weevil
  • Tularosa and Alamogordo
    • Inspector randomly inspected pecan trees in Tularosa and Alamogordo area - No evidence of pecan weevil
imported pecans
Imported Pecans
  • Interstate/Intrastate
    • Master Permits
      • Alabama
      • Texas
    • Random checks of retail areas
      • inspections - 67
  • International
    • Compliance agreements with importers
      • Check all certifications
      • Trash disposal requirements
      • Inspect loads
what next
What Next
  • Otero County
    • 1 weevil captured
    • Spray – 2 more years
  • Dona Ana County
    • 6 weevil captured
    • Spray – 2 more years
acknowledgements
Western Pecan Growers Association

Pecan Task Force

New Mexico State University

Otero County Pecan Growers Association

Otero County Cooperative Extension Service

Texas Agricultural Extension Service, Bill Ree

Agriliance

Rose Garcia, Juan Gamon, Bill Guthrie, Barbara Sharpe

NMDA staff

Acknowledgements