Pecan Weevil Update Sherry Sanderson Chief Entomology and Nursery Industries Bureau New Mexico...
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Pecan Weevil UpdatePecan Weevil Update
Sherry Sanderson
Chief
Entomology and Nursery Industries Bureau
New Mexico Department of Agriculture
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BiologyBiology
2-3 year life cycleAdult emerges, feeds and lays egg in
gel stage of pecan nutLarvae feed on the pecan nutletLarvae drills a hole in pecan nut and
drop to the groundLarvae tunnels 12” to 24” inches into
soil
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HostsHosts
Pecan American Hickory
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LocationLocation
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.
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Eradication EffortsEradication Efforts
Emergence MonitoringInsecticide ApplicationsCold TreatmentCleaning Plant InspectionsImport Inspections
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Emergence MonitoringEmergence MonitoringCounties 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
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Insecticide ApplicationsInsecticide 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
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Trapping Results 2003Trapping 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
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Cleaning Plant InspectionsCleaning 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.
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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
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House SurveyHouse 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
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Imported PecansImported 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
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What NextWhat Next
Otero County– 1 weevil captured– Spray – 2 more years
Dona Ana County– 6 weevil captured– Spray – 2 more years
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AcknowledgementsAcknowledgements
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