Oklahoma Pecans: Time to Obtain Pecan Nut Casebearer Traps

Pecan nut casebearer damage. Photo: Lenny Wells, University of Georgia

If you have not ordered your Pecan nut casebearer (PNC) pheromone traps it is time to do so. As a general rule for southern and central Oklahoma, traps should be in the orchard by the first week of May. The key to using the pheromone traps is to have the traps out early in order to detect the onset of a flight.

The initial date of collection, when moths are collected will act as a benchmark for predicting egg laying (oviposition). As a general rule ovipositon will start 7 – 10 days after first capture and nut entry starts 12 – 16 days after initial catch.

In 2019, we hope to resurrect online information on PNC activity and generate a PNC Risk Map. We also hope we can make it available for growers to become contributors to the national data entry. Information from other southern sites (Texas) can help Oklahoma growers anticipate the initial arrival of moths in our area and subsequent oviposition activity.

In the meantime, for an individual forecast for your orchard all you need is the date of your initial catch of male moths in the traps. Remember, you must have two consecutive nights of captures to set a biofix (see table 1 below for examples).

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Capturing just one or a few moths on a single, isolated night does not establish the biofix, you must capture moths on two consecutive nights to establish that time. In general, 13 days after the established biofix, 25% of the eggs of PNC will be deposited; therefore, this is the time to begin scouting. OSU Fact Sheet 7189 “Scouting for the pecan nut casebearer” provides guidelines for scouting.

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Every three days, growers should be scouting for PNC eggs and/or the first signs of damage, and continue that process until approximately the middle of June. Trap captures can also help indicate when PNC activity has temporarily ceased. If you find 2 infested clusters before reaching 310 clusters checked this warrants treatment.

The following list provides some companies that sell PNC pheromone traps. Only 3 traps are needed for 50 acres or less and at least 5 traps for 50 or more acres, but each grower may have separate areas that need monitoring. If you order pheromone and traps from any of these sites, DO NOT leave the pheromone source out at room temperature.

The small rubber septa that contains the pheromone should be placed in the FREEZER until you place traps in the orchard. When traps are deployed, simply place the rubber septa in the middle of the sticky trap bottom.

Pecan Nut Casebearer Pheromone and Traps Can be Ordered from:

  • Trece, Inc. P.O. Box 129P.O. Box 129 Adair, OK 74330 Ph: 918-785-3061 Fax: 918-785-3063 Email: custserv@trece.com Order Center: 866-785-1313 http://www.trece.com/
  • Advanced Pheromone Technologies, Inc. Ph: 971-327-7129
  • Gempler’s P.O. Box 44993 Madison, WI 53744-4993 Order by Phone: 1-800-382-8473
  • Great Lakes IPM Inc. 10220 Church Road Vestaburg, MI 48891-9746 Ph: 989-268-5693 or 989-268-5911 Toll Free: 1-800-235-0285 Fax: 989-268-5693 E-mail: glipm@nethawk.com
  • ISCA Technologies / Moritor Technologies P.O. Box 5266 Riverside, California 92517 Tel: 951-686-5008 Fax: 815-346-1722 email: info@iscatech.com Web: www.iscatech.com
  • Oliver Pecan Co. Inc. 1402 W. Wallace, San Saba, TX 76877 800-657-9291 E-mail: soliver@centex.net
  • Pape Pecan House P.O. Box 1281 101 S. Hwy 123 Bypass Seguin, TX 78155 Ph: 830-379-7442
  • Southern Nut ‘n Tree Equipment, Inc. and Pecan Producers, Inc. 324 SH 16 South Goldthwaite, TX 76844 1-800-527-1825 Fax: 325-938-5490 E-mail: sales@pecans.com

With PNC activity being dependent on temperature and if spring temperatures are higher than normal across the state, we can expect to see little difference in activity from south to north. So, do not wait too late to set out pheromone traps. PNC pheromone traps provide real time information on activity for individual orchards.

Products recommended for PNC control include the softer products (Intrepid, Confirm, B.t.) that are gentler on beneficial organisms and safer for the environment. Save the harsher, less discriminating products (e.g. pyrethroids, or Sevin) for weevil season toward the end of the summer.

If you are too late for ordering are using PNC traps then keep an eye out for advisory, which has nearly 15 growers/cooperators that are running traps throughout the state. I will post results of captures that these folks are obtaining once all the traps are set out. This way you can track the emergence of 1st generation PNC and have a better picture of when to scout.

Based on nine traps in an orchard site in the Arbuckle Mountains, no PNC have been captured yet.

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