Texas A&M AgriLife Extension TEXAS PECAN PEST MANAGEMENT NEWSLETTER Bill Ree, Extension Program Specialist III - IPM (Pecan) P.O. Box 2150, Bryan, TX 77806-2150 August 7, 2015 Ph: 979-845-6800 #15-8 Email: w-ree@tamu.edu http://pecan.ipmpipe.org ***************************************** TEXAS PECAN GROWERS ASSOCIATION 4348 Carter Creek, Suite 101 Bryan, TX 77802 Ph: 979-846-3285; Fax: 979-846-1752 Email: pecans@tpga.org www.tpga.org GENERAL Well we sure have gone from an abundance of rain to hot and dry and this is not a good situation. We had excellent early season moisture to size up nuts but now it is going to be difficult to fill them out. Given the current time and situation I would like to reference an excellent article by Mr. Monte Nesbitt from the August 2010 issue of Pecan South (Vol. 43, No. 6, p. 6) titled Victory or Defeat in August. If you have back copies this article is good for another read in that it highlights the difficulties of growing pecans during August. out at any time. Products such as Intrepid, Intrepid Edge, Confirm, Altacor and Belt which are specific for Lepidoptera (caterpillars) can do an excellent job with one application. If you are targeting only HSW then these products are recommended. Stink bugs: It is that time of year when adult stink bugs and leaffooted bugs will be moving into the orchard. As weed hosts and row crops are senescing or are being harvested, adults will move to pecan to feed. Be aware of what is going on around the orchard and watch border rows for migrating adults. Unfortunately there are not any thresholds to guide SB/LFB treatments. If adults are being observed on clusters then a treatment is probabaly needed and if so a pyrethroid class insecticide will be the product of choice. 2015 TPGA CONFERENCE Thank you Cindy, Blair and Evelyn for organizing another great conference. Hope to see everyone in San Marcos next year. INSECTS Black pecan aphids: Black aphids are building up in some orchards and treatments are being applied. I would like to remind everyone of the importance of rotating IRAC group numbered compounds in their management program. If you are using an imidacloprid product for black aphids the labeled rate is usually higher than that for blackmargined aphids. Hickory shuckworm: Treatments for HSW on early maturing cultivars such as Pawnee should have already been applied and treatments for other cultivars can go Figure 1Brown stink bug feeding through pecan shell With stink bugs able to cause damage late in the season the preharvest interval (PHI) will have to be observed. The closest PHI for a pyrethroid that I am aware of is
Danitol which has a 3 day PHI. Pecan Weevil: With the dry conditions, drought delayed emergence of adults will probably be occurring. The use of adult emergence traps can detect this delayed emergence which in turn will alert producers that a treatment is needed. The chart below (datafrom research by Dr. Marvin Harris) shows the emergence of adults in mid October after a rain. Adult females will lay eggs in pecans up to shuck split so trasp should be monitored up to shuck split of the latest maturing varieties. Carbaryl is still a product of choice but control can also be achieved with bifenthrin. Pecan leaf scorch mites: margin. For suppression, dimethoate will work but for serious outbreaks you will need a miticide. Check out the insecticide data base under the Too Box link at http://pecan.ipmpipe.org for labeled products for scorch mites. CROP PREDICTIONS FROM TPGA CONFERENCE Millions of pounds Littlepage 2015 TriState Mtg Brookshier 2015 TPGA June 19th Alabama 19 19 Arizona 25 25 Arkansas 1 1 California 6 5 Florida 0.5 0.5 Georgia 80 110 Kansas 0.5 0.5 Louisiana 4 4 Mississippi 1 1 Missouri -- -- New Mexico 70 82 North Carolina 0.5 0.5 Oklahoma 35 30 South Carolina 0.5 0.5 Texas 40 48 US Total 283 327 2015 TPGA STATE PECAN SHOW CHAMPIONS Grand Champion - Commercial Division Lloyd and Connie Boedeker, - DeWitt County Forket - 33.77/lb ; 62.4% Kernel Reserve Grand Champion Commercial Division Kernell Mortiz Victoria County Nacono - 32.87/lb; 57.46 % Kernel Grand Champion - Classic Division Tim Meir Washington County Mandan 44.42/lb. ; 66.9% kernel (no this is not a typo!) Reserve Champion - Classic Division Lloyld and Connie Boedeker DeWitt County Prilop - 53.65/lb; 62.73 % kernel Hot dry weather is conducive forscorch mites and I have seen some activity heavy enough where treatments had to be made. In the picture above note some light bronzing along the mid-vein of the leaf which is typical of scorch mites. This damage should not be confused with typical leaf scorch which occurs along the leaf Grand Champion -Native Division John Vermersch Austin County; 65.8 lb. 55.25% kernel Reserve Champion Native Division John Vermersch Austin County: 63.49/lb. 56.31% kernel
Lightest native Katherine Kniffen 1106.34/lb. (% kernel not taken). I believe this is a state pecan show record. UP COMING MEETINGS Texas Counties August 14, 2015 Parker County Pecan Weevil Field Day Contact: Jon Green Parker County CEA State Meetings August 28, 2015 Arizona Pecan Growers Annual Conference Clarion Air Port Hotel Tucson, AZ Contact: Mike Kilby, mkilby@cals.arizona.edu 520-403-46-13 September 3, 2015 Georgia Pecan Growers Fall Field Day Contact: Janice@georgiapecan.org September 17, 2015 Alabama Pecan Growers Annual Meeting Gulf Coast Research Center Fairhope, AL 2016 July 10 13, 2016 TPGA Annual Conference and Trade Show Embassy Suites San Marcos, TX The information given herein is for educational purposes only. References to commercial products or trade names are made with the understanding that no endorsement by the Texas AgriLife Extension Service is implied. Educational programs of the Texas A&M AgriLife Extension Service are open to all people without regard to race, color, religion, sex, national origin, age, disability, genetic information or veteran status. The Texas A&M University System, U.S. Department of Agriculture, and the County Commissioners Courts of Texas Cooperating
Table 1. Fungicides labeled for control of Pecan Scab and generally considered effective, 2015. Active Ingredient Fungicide Resistance Group (FRAC) Tradename(s)* Max product per acre per application and total product per acre allowed per year** Azoxystrobin 11 Abound (Syngenta) 12 oz/a; 73.8 oz/a/yr Azoxystrobin + 11,3 Quadris Top (Syngenta) 14 oz/a; 56 oz/a/yr
Difenconazole Azoxystrobin + Propiconazole 11,3 Quilt (Syngenta), Quilt Xcel (Syngenta) 27.5 oz/a; 122 oz/a/yr 21 oz/a; 115 oz/a/yr Dodine 12 ELast 400 (Aceto) 3 pt/a; 18 pt/a/yr Fenbuconazole 3 Enable 2F (Dow) 8 oz/a; 48 oz/a/yr Kresoxim-methyl 11 Sovran (BASF) 4.8 oz/a; 14.4 oz/a/yr Metconazole 3 Quash (Valent) 3.5 oz/a; 14 oz/a/yr Phosphorus acid 33 Phostrol 5 oz/a; n/a Propiconazole 3 Orbit (Syngenta), Bumper (MANA), 8 oz/a; 32 oz/a/yr Tilt (Syngenta), Propimax (Dow), others Propiconazole + 11,3 Stratego (Bayer) 10 oz/a; 30 oz/a/yr Trifloxystrobin Pyraclostrobin 11 Headline (BASF) 7 oz/a; 28 oz/a/yr Pyraclostrobin + Boscalid 11,7 Pristine (BASF) 14.5 oz/a; 58 oz/a/yr Tebuconazole 3 Tebuzol (UPI), Folicur (Bayer), 8 oz/a; 32 oz/a/yr Toledo (Rotam), Monsoon (Loveland), Orius 3.6 F (MANA) 11,3 Custodia (MANA) 17.2 oz/a; 69 oz/a/yr Azoxystrobin 3, 33 Viathon (Helena) 2.5 pts/a; 16.5 pts/a/yr phosphorous acid trifloxystrobin 11,3 Adament (Bayer), Absolute (Bayer) 8 oz/a; 32 oz/a/yr 7.7 oz/a; 46 oz/a/yr Thiophanate-methyl 1 Topsin M WSB (UPI), others 1 lb/a; 3 lbs/a/yr Triphenyl tin hydroxide 30 Agri Tin (Nu Farm) Super Tin 80 WP (UPI) Super Tin 4L (UPI) 7.5 oz/a; 45 oz/a/yr 12 oz/a; 72 oz/a/yr *Trade names are listed for informational purposes and do not imply a product endorsement. Any trade-names omitted were done so for brevity and space and not to imply product inadequacies. **Refer to product labels for additional product usage guidance and restrictions Product labels can be found conveniently at the http://pecan.ipmpipe.org/ website.