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This document describes the diseases that occur most frequently on pecan trees in Louisiana.
Pecan scab disease is the most economically damaging disease of pecan production in the southeastern United States. The disease affects stem, leaf and nut growth, causing reduced yield. This publication includes information on the development, symptoms and control of the disease. (PDF format only)
The most important cultural practice the homeowner with pecan trees needs to consider is proper fertilization. This publication includes information and guidelines for fertilizing pecan trees. (PDF Format Only)
This document describes the diseases that occur most frequently on pecan trees in Louisiana.
The key components of the effective use of fungicides for pecan disease control are timing, coverage and concentration. The updated 2015 fungicide list is included.
(Video) Pecan trees planted nearly a century ago stand majestically on the LSU AgCenter’s Pecan Research Station, the only university research facility in the country exclusively devoted to this nut crop. Researchers at the station, which is located near Shreveport, address all areas of commercial pecan production from horticulture, fertilization, tree planting, growth and shape, harvest efficiency and insect and disease control.
Food allergy affects approximately 6-8% of children under 4 years of age. Nuts and tree nuts (including pecan) are recognized to be among the eight food groups that cause the majority of food allergies. USDA and LSU AgCenter scientists are studying the allergens present in pecans and trying to develop methods to reduce or eliminate allergens in pecan kernels.
Food allergy affects approximately 6-8% of children under 4 years of age. Nuts and tree nuts (including pecan) are recognized to be among the eight food groups that cause the majority of food allergies. USDA and LSU AgCenter scientists are studying the allergens present in pecans and trying to develop methods to reduce or eliminate allergens in pecan kernels.
Dr. John Pyzner, LSU AgCenter pecan and fruit specialist, explains how much fertilizer should be applied to a pecan orchard.
Two species of yellow aphids are found on pecans in Louisiana and in all pecan-producing states. Descripton, life cycle, damage and control information is included. (PDF Format Only)
The hickory shuckworm is distributed throughout most of the area where pecans are grown – from South Carolina to Texas and Oklahoma. In Louisiana, the hickory shuckworm is found throughout the state. (PDF format only)
Pecan phylloxera are found throughout the native pecan-producing regions of the United States. Beginning in mid-April, galls (knots) begin to appear on the leaf veins, leaf rachises, catkins, current season's shoot growth and nuts of the pecan. Damage, description, life cycle and control information is included. (PDF Format Only)
(Video) Pecan trees planted nearly a century ago stand majestically on the LSU AgCenter’s Pecan Research Station, the only university research facility in the country exclusively devoted to this nut crop. Researchers at the station, which is located near Shreveport, address all areas of commercial pecan production from horticulture, fertilization, tree planting, growth and shape, harvest efficiency and insect and disease control.
The page provides directions on how to get to the Pecan Research-Extension Station.
Pecan variety recommendations for yards and small, unmanaged plantings.
Dr. John Pyzner, LSU AgCenter pecan and fruit extension specialist, tells how long it will take for pecan trees to begin producing.
Dr. Mike Hall, LSU AgCenter Entomologist, explains what the sticky substance on the leaves is and what causes it, and Dr. Randy Sanderlin, LSU AgCenter Plant Pathologist, explains the effect that the sticky substance can have on the trees.
The following list contains contact information for nurseries that sell pecan trees and/or propagation wood. The list is furnished for your information with the understanding that no discrimination is intended and no guarantee of reliability is implied.
This article provides information on storing shelled and unshelled pecans. A table indicating the average shelf life of pecans when stored at various temperatures is included.
The article provides a brief description of factors to consider when harvesting and storing pecans.
This article provides instructions on when and how to collect leaf samples for pecan nutritional analysis.
Plant pathology researchers at the Pecan Research-Extenstion Station explain what can happen to a pecan tree that has Pecan Bacterial Leaf Scorch.
This is a discussion that should help in making the yearly decision on when to begin the pecan fungicide application program.
This article is a copy of a paper presented at the National Pecan Scientists Meeting in Branson, Missouri, in July 2005.
Topics included are: Nut scab control for June through July, 2011. This year’s recommended fungicide list. New Pecan Sprayer Calibration Publication. Neighbooring states' crop outlook so far. The 2011 Convention & Trade Show will be held June 16 & 17.
In this issue the topics mentioned are wood rot of pecan trees and winter activities to prepare for a new season.
Topics mentioned in this issue include: Fungicide classifications by the Fungicide Resistance Action Committee (FRAC), a simple hot-water procedure to reduce graft-transmission of the pecan bacterial Leaf scorch pathogen, Pecan Phylloxera and early spring activities in the pecan orchard.
(Video) Pecan trees planted nearly a century ago stand majestically on the LSU AgCenter’s Pecan Research Station, the only university research facility in the country exclusively devoted to this nut crop. Researchers at the station, which is located near Shreveport, address all areas of commercial pecan production from horticulture, fertilization, tree planting, growth and shape, harvest efficiency and insect and disease control.
Overcrowded trees may be the number one cause of decreased nut production in older orchards through the southern United States.
Four-flap Grafting Method
The Third Quarter newsletter contains sections on: Identify Sources of Scion Wood to Avoid Graft-Transmission of PBLS Pathogen, Little Value in Applying Fungicide For Scab Disease Control After the Middle of August, Control of Stink Bugs and Leaffooted Bugs, MarketMaker Will Help Pecan Producers, and the Interstate 69 Issue.
This report provides information on future plans, program significance, industry facts, and research highlights for the Pecan Research and Extension Station.
Topics include: Crop thinning, scab disease, pecan spittlebug and the LSU AgCenter Pecan Station Field Day.
The first quarter newsletter describes early spring activities to preform in the orchard including planning of your scab disease control program for the next season & control of pecan phylloxera.
Plant pathology researchers explain what you can do to avoid collecting scion wood infected with the pecan bacterial leaf scorch pathogen and offer an alternative to help reduce pathogen spread if collecting scion wood from infected trees can not be avoided.
Plant pathology researchers explain pecan scab disease resistance.
This page provides information on pecan pollen shed and pistillate flower receptivity dates for numerous pecan cultivars. This information is useful for determining which pecan cultivars will pollinate other cultivars.
This article provides a brief history of the Pecan Station as well as its current status and plans for the future.
Dr. Charles Graham, LSU AgCenter horticulturist, explains what you should consider before planting a pecan tree.
Dr. Charles Graham, LSU AgCenter horticulturist, explains what you can do if your hands get stained from working with pecans.
This document provides a step-by-step procedure for hot water treatment of pecan scion wood to eliminate the bacterial leaf scorch pathogen.
The information contained in this article was presented at the March 31, 2006, Pecan Clinic near Cloutierville, La. The objectives for pruning damaged trees are listed and several types of pruning cuts are defined.
The page provides access to the In A Nutshell Newsletters sent out in 2006.
Dr. Randy Sanderlin, LSU AgCenter Plant Pathologist, describes the symptoms of Pecan Bacterial Leaf Scorch.
Dr. Randy Sanderlin, Pecan Research-Extension Station plant pathologist, explains when fungicides should be applied.
Dr. Charles Graham, LSU AgCenter Horticulturist, describes the differences between protandrous and protogynous trees.
Dr. Randy Sanderlin, LSU AgCenter plant pathologist, explains what the black spots on the leaves and nuts could be and how to prevent them.
Dr. Mike Hall, Pecan Research-Extension Station Entomologist, explains what causes the yellow spots and the defoliation.
Dr. John Pyzner, LSU AgCenter pecan and fruit extension specialist, explains when fertilizer should be applied to pecan trees.
Dr. John Pyzner, LSU AgCenter pecan and fruit extension specialist, tells where pecan trees can be purchased.
Dr. Randy Sanderlin, LSU AgCenter plant pathologist, discusses the difference between grafted and ungrafted pecan trees.
Dr. Randy Sanderlin, LSU AgCenter plant pathologist, explains the difference between a pecan variety and a cultivar.
Dr. Charles Graham, LSU AgCenter Horticulturist, explains the difference between seedling and native pecan trees.
Dr. Mike Hall, LSU AgCenter entomologist explains what causes twigs to be cut from pecan trees.
Dr. Mike Hall, LSU AgCenter entomologist, explains what the knots or balls that form on the leaves and stems of pecan trees are and what effect they will have on the tree.
Dr. Mike Hall, LSU AgCenter entomologist, explains what causes the bag- or tent-like webs seen in pecan trees are and what effect the webs will have on the tree.
Dr. John Pyzner, LSU AgCenter pecan and fruit extension specialist, explains why it is important to get a leaf analysis done on your pecan trees and when the leaves for analysis should be collected.
This article answers the question, "Why do my pecan trees have a large crop followed by a small one?" and provides answers to several questions concerning mechanical thinning.
Dr. Randy Sanderlin, Pecan Research-Extension Station plant pathologist, talks about fungicides and their control of pecan scab disease.
An illustrated fact sheet describing the life cycle of the fall webworm. Included in the article is a description of the insect, the damage it causes and suggestions for control.
Information and images describing the appearance and life cycle of pecan leaf scorch mite. Information on damage and control are also included in the article.
Dr. Charles Graham, LSU AgCenter Horticulturist, explains why pecan trees sometimes have a large crop followed by a small crop.
An illustrated fact sheet describing the appearance and life cycle of the pecan nut casebearer. A description of the damage and information on monitoring pecan nut casebearer activity are included.
Dr. Randy Sanderlin, LSU AgCenter plant pathologist, explains the term "pecan tree cross."
A general overview of pecan orchard floor management is given and herbicides labeled for use in pecan orchards are listed by site activity.
The page provides the address and contact information for the Pecan Research-Extension Station.
The key components of the effective use of fungicides for pecan disease control are timing, coverage and concentration. The updated 2015 fungicide list is included.
This page provides helpful links to other websites containing pecan-related information.
An illustrated fact sheet describing the life cycle of stink bugs and leaffooted bugs known to attack pecans in Louisiana. Included in the article is a description of the damage caused by these insects and information on their control.
This poster includes images and information on many cultivars grown in research orchards at the LSU AgCenter Pecan Research-Extension Station.
An illustrated fact sheet describing the appearance and life cycle of the pecan weevil. Information on damage and control are also included.
An illustrated fact sheet describing the appearance and life cycle of the hickory shuckworm. Information about damage and control are included.
An illustrated fact sheet describing the appearance and life cycle of the nut curculio. A description of the damage and information on sampling are also covered.
An illustrated fact sheet describing two types of traps that can be used to monitor seasonal activity of the nut curculio in pecan orchards. This fact sheet describes how to build and use both types of traps.
An illustrated fact sheet describing the appearance and life cycle of the walnut caterpillar. Included in the article is information on damage and control.
An illustrated fact sheet describing the appearance and life cycle of the pecan spittlebug. A description of the damage caused by the pecan spittlebug and sampling information are included.
An illustrated fact sheet describing the appearance and life cycle of the black pecan aphid. A description of the damage and information on sampling are included.
The most important cultural practice the homeowner with pecan trees needs to consider is proper fertilization. This publication includes information and guidelines for fertilizing pecan trees. (PDF Format Only)
Current insecticide recommendations for commercial pecan orchards in Louisiana. This illustrated guide provides information on insecticides, rates of application and timing of applications. For each insect listed, a photo of the insect, damage caused by the insect or both are provided.
(Distributed 10/19/04) An LSU AgCenter researcher says trimming pecan trees could make owners more money in the long run.
Pecan Personnel Portal
For more than two decades there was uncertainty about the cause of a common disease among pecan trees referred to as leaf scorch. LSU AgCenter researchers were able to distinguish the cause of the disease, which has improved pecan production.
