Oklahoma Farm Report masthead graphic with wheat on the left and cattle on the right.
Howdy Neighbors!
Ron Hays, Director of Farm and Ranch Programming, Radio Oklahoma Ag Network  |  2401 Exchange Ave, Suite F, Oklahoma City, Ok 73108  |  (405) 601-9211


Agricultural News

Be Vigilant for Pecan Weevil Emergence

Wed, 02 Sep 2020 09:49:43 CDT

Be Vigilant for Pecan Weevil Emergence With recent rains driving nut development, pecan growers should be watching their orchards for signs of pecan weevil activity. Where they look, however, is a matter of seasonal timing.

Pecan weevils cause two primary types of damage, depending on the stage of fruit development when the pests are active, said Phil Mulder, head of Oklahoma State University's Department of Entomology and Plant Pathology.

"Nuts that are punctured and drop off the tree indicate weevils have fed on the kernel in the water stage of development," he said, referring to a stage at which the shell and kernel seed coat have reached their full size. "The amount of this type of damage depends on weevil population density, time of emergence and longevity of the weevils."

Research has shown that individual weevils destroy an average of about one pecan every four days. When shells harden later in the season, weevils enter the nut to lay eggs. Pecan shucks may adhere to the shell past normal harvest time when that happens.

Additional damage is caused by the larvae as they feed on the kernel for several weeks. Such mature nuts typically do not drop from the tree while the larvae grow. Two to four larvae within each infested nut can easily destroy the entire kernel.

"A female weevil can produce 30-54 eggs, so several nuts can be affected from each egg hatch," Mulder said. "Egg-laying begins when nuts reach the dough stage typically late August to early September so early maturing pecan varieties are the most susceptible."

OSU Extension recommendations are for orchards with a history of pecan weevil problems to be monitored even more carefully than usual. Insecticides should be applied as close to the peak emergence period as possible. Record-keeping matters.

"Developing an orchard history as to weevil occurrence can help anticipate emergence and treatment times," Mulder said. "Growers who have not done so in the past should start doing so this year. It really does help make management easier."

Circle traps are useful for weevil monitoring, providing good indications of weevil presence and abundance within an orchard.

For more information on pecan weevil control and other research-based orchard management practices, consult OSU Extension fact sheets, available online and through all county Extension offices.

OSU Extension is one of two state agencies administered by the university's Division of Agricultural Sciences and Natural Resources and is a key part of OSU's state and federally mandated teaching, research and Extension land-grant mission.



WebReadyTM Powered by WireReady® NSI


Top Agricultural News

  • Oklahoma Youth Expo Sale of Champions Sale Order Available Here- Sale Set for 4 PM Friday  Fri, 17 Mar 2023 04:50:54 CDT
  • Rural Voters Dominated Vote to Defeat Recreational Marijuana March 7th  Fri, 10 Mar 2023 07:13:05 CST
  • Ron Hays Talks to Israeli Ag Tour Guide Colin Lotzof About the Miraclel of Ag in Israel  Wed, 22 Feb 2023 22:11:04 CST
  • OALP Members Experience First Hand View of Cutting Edge Drip Irrigation Technology as Israel Travel Ends  Wed, 22 Feb 2023 10:51:49 CST
  • OALP Members Get First Hand View of Cutting Edge Drip Irrigation Technology as Israel Travel Ends  Wed, 22 Feb 2023 10:50:10 CST
  • Oklahoma Ag Leadership Program Sees Fruit, Beef and Dairy Production North of the Sea of Galilee in Israel  Mon, 20 Feb 2023 21:56:02 CST
  • Oklahoma Ag Leadership Program Sees Diverse Farm Operations in Jordan River Valley of Israel  Sun, 19 Feb 2023 21:17:30 CST
  • Israeli Tour Guide Mark Kedem Talks About The Cultural Aspects of What Class XX of OALP is Experiencing   Sat, 18 Feb 2023 22:17:23 CST

  • More Headlines...


    Ron salutes our daily email sponsors!

    Oklahoma Beef council Oklahoma Ag Credit Oklahoma Farm Bureau National Livestock Credit Ag Mediation Program P&K Equipment Oklahoma City Farm Show Union Mutual Stillwater Milling Oklahoma Cattlemen's Association KIS FUTURES, INC.

    Search OklahomaFarmReport.com

    © 2008-2023 Oklahoma Farm Report
    Email Ron   |   Newsletter Signup   |    Current Spots   |    Program Links

    WebReady powered by WireReady® Inc.