Fungicide Schedule. Pecan planting is usually done during December and January when the trees are dormant. Topsin M (active ingredient thiophanate-methyl) is a product recommended by Texas A&M for control of pecan scab, but it has a high resistance risk. But getting the best use out of them and doing so in a manner that prevents resistance development can be confusing for some folks. There are other fungicides that could be substituted here, but this does provide an example of an effective fungicide program for pecan scab. aid growers in proper timing of fungicide applications for pecan scab. It has a moderate resistance risk. Using these hours and knowing the susceptibility of the pecan variety, the grower can decide whether to spray or not. However, the best bets for home growers are to select resistance cultivars and to use good cultural practices. Enable® 2F fungicide is a protectant fungicide for the control of damaging diseases in citrus, pecans, sugarbeets and peppers. Therefore, this practice is not foolproof, so preventative fungicide applications may become necessary for control of scab. If we get rain I'd recommend a spray before that, but unless it's been rainy there, you shouldn't be seeing new infections right now. The fungus causes lesions and tissue death on pecan twigs, petioles, leaves, nuts and shucks beginning in early spring, with multiple cycles of infection repeating until late summer. Itis important to understand this relationship so that the best fungicide choices can be made forcontrol of scab. On average, you must spray about 12 times every growing season. Add in damaging secondary diseases like downy spot, leaf scorch and powdery mildew and you have a recipe for pecan disease disaster. These examples serve only as two possible options for fungicide programs to manage scab. •UGA fungicide test, Ponder Farm, Tifton, 2010 •Cultivar Desirable, foliage assessed 20 July •Bmjand B. subtilis •Data courtesy of Dr Tim Brenneman , University of GA Biocontrol of anthracnose. The cultural practices that can help in preventing pecan scab all involve ways of getting air moving around the trees to keep them dry. However, before commercial growers and homeowners begin putting trees in the ground, they must consider their fungicide spray options to manage scab disease. Jump To: Benefits Crops Controlled diseases State registrations Technical specifications Resources 1. You have to follow up with a continuation of sprays, rotating three different fungicides. This disease sometimes causes defoliation in the … There are three categories of fungicide resistance risk. There are three categories of fungicide resistance risk. However, the scab fungus can change over time and adapt to resistant varieties. All Rights Reserved.The University of Georgia is an Equal Opportunity / Affirmative Action Institution.Privacy Policy, Pecan Growers Eligible for CFAP 2 payments, Hurricane/Tropical Depression Sally Impact on SE Pecan Production. The following 8-spray fungicide schedule is provided as an example of one option to use for pecan scab management in light of the emerging scab insensitivity issues surrounding some of our fungicides. The UGA Pecan Team provides timely information relevant to pecan production in Georgia for use by county extension agents and pecan producers. ENABLE® 2F FUNGICIDE Pecan scab is one of the most serious diseases affecting U.S. pecans, destroying entire crops if not controlled. We’re fortunate to have a wide variety of fungicide options for pecan scab management. We le in reducin ver sprays a was not d), then “get ma Pecan G s ago then y iversity 78 Specialist r so far this a drea. But it is not the only disease that growers may face in the new season. Pecan scab (caused by Venturia effusa) is a destructive disease of pecan in the southeastern United States. Fungicide Application Recommendations for Pecan Disease Control In Louisiana, control of diseases is required for consistent production of high quality pecans. Pecan Scab Control. Some fungicides with excellent control properties against scab are also highly prone to resistance. Are you sure it's pecan scab and not aphid damage? With so many options available, there are many different fungicide programs that could be put together. All Rights Reserved.The University of Georgia is an Equal Opportunity / Affirmative Action Institution.Privacy Policy, Phosphorus, Potassium, and Zinc Fertilization of Young Trees, Ambrosia Beetles and Bud-break on the Move, Pecan Growers Eligible for CFAP 2 payments, Hurricane/Tropical Depression Sally Impact on SE Pecan Production. Not much has changed from previous years with the exception of the use of phosphite alone in one of the early sprays. Pecan scab fungicides are organized by their category of resistance risk in Table 1. Not only was the yield lowered by scab, but the cost of the fungicide had an effect on crop productivity. Control of pecan scab disease depends primarily on protection of tender leaf, nut, and shoot surfaces with application of an effective fungicide. Since Tin is such an integral part of our fungicide arsenal for pecans and we do see some orchards with insensitivity to Tin, we are recommending saving any Tin sprays for the nut scab period since this material is better on nut scab than it is on leaf scab. Susceptible cultivars must be sprayed with fungicide every 10 to 21 days to ensure yield and kernel quality. Since Tin is such an integral part of our fungicide arsenal for pecans and we do see some orchards with insensitivity to Tin, we are recommending saving any Tin sprays for the nut scab period since this material is better on nut scab than it is on leaf scab. is important to understand this relationship so that the best fungicide choices can be made for control of scab. Symptoms of infection are similar on all parts of an infected plant. If you have an established orchard of susceptible cultivars, the best way to manage scab is to implement a fungicide spray program to reduce the rate of disease. Using weather data from the Oklahoma Mesonet, the pecan scab advisor tracks hours when pecan scab risk is high. Liver spot is characterized by the appearance of reddish brown (liver colored) circular spots one-eighth to five-eighths inch in diameter on the lower side of leaflets (Figure 3). Pecan scab is by far the most economically significant disease that infects pecans in the southeastern United States and is the focal point in developing a fungicide spray program. Host resistance is the best control but has to be decided early in the establishment of the orchard. Pecan Scab, a disease cased by the fungal pathogen Fusicladium effusum, can drastically reduce nut yield. Fungicide is most often applied using large orchard air-blast sprayers. This approach was followed, … Some fungicides with excellent control properties against scab are also highlyprone to resistance. A preventive fungicide spray program is very effective to prevent scab on pecans. Higher use rates are required to achieve and maintain control of pecan scab. I list it here for spray number 2 but it should work for spray 3 or possibly number 4 as well, depending on how soon you get to spray 4. While commercial pecan growers have the this is not the case for homeowners with only a few trees. Using weather data from the Oklahoma Mesonet, the pecan scab advisor tracks hours when pecan scab risk is increased. Timing of fungicide application based on calendar date is a common practice for managing scab-susceptible pecan (Gottwald and Bertrand, 1988; Brenneman et al., 1999), with sprays starting mid-April and applied approximately every two weeks for 16 weeks until early-mid-August, at shell-hardening (Gottwald and Bertrand, 1988; Brock and Brenneman, 2011). Enable 2F brings dependable broad-spectrum control of greasy spot, scab, powdery mildew and more. The fungicide groups with recommended products labeled for pecan that have the highest tendency for resistance include Group 3 (DMIs) and Group 11 (Strobilurins). We’re fortunate to have a wide variety of fungicide options for pecan scab management. New pecan scab infections only occur when you have 2-4 hours of wetness and it's been hot and dry, you shouldn't be having much problems with scab right now. The Pecan Scab Advisor is a decision support tool that has been developed to aid growers in proper timing of fungicide applications for pecan scab. Wind and rain spread the fungus to a susceptible host. UGA Extension © 2012-2020. Even as pecan harvest is under way across Alabama, soon it will be time to plant new pecan trees. A should be pplied at application scab. pecan grow cultivars hav fungicide sp growers ma damage to season. Don’t let scab, downy spot and other diseases ruin pecan quality and yield. Because good spray coverage is required and If an orchard has a documented high level of insensitivity to any of the fungicides listed above, the grower should contact one of the UGA Plant Pathologists for specific recommendations. Pecan scabfungicides are organized by their category of resistance risk in Table 1. The current recommendation is 2-3 quarts per acre of phosphite fungicide. Pecan scab control and fungicide coverage from ground-based sprayers Clive H. Bock, Mike W. Hotchkiss, Ted E. Cottrell, and Bruce W. Wood USDA-ARS-SEFTNRL, 21 Dunbar Rd., Byron, GA 31008 . Big commercial growers spray fungicides repeatedly on their pecan trees in an attempt to reduce pecan scab symptoms. If this disease is a consistent problem on your pecans, consult with your local county agent or the LSU AgCenter Pecan Station for the best fungicides to use. But getting the best use out of them and doing so in a manner that prevents resistance development can be confusing for some folks. Pecans (Carya illinoensis) are common as a shade and nut tree in the southeastern U.S., where they also grow wild in native bottomland forests. Below you will find a link to one example of a fungicide program that would work. Many more could be developed. In the past, many of our pecan growers were using 1 quart per acre. Another recommended product is Enable (active ingredient fenbuconazole). We commonly get requests for a single fungicide program that growers could use. The fungicide groups with the highest tendency for resistance selection should be used in the first half of the growing season which is when scab disease intensity is usually lowest. Venturia effusa is a fungal plant pathogen that causes pecan scab. Below is an 8-spray fungicide schedule from UGA Extension Horticulturalist Dr. Lenny Wells provided as an example to use for pecan scab management in light of emerging scab insensitivity issues surrounding some fungicides. I have had many requests to provide a pecan fungicide schedule example for 2018. UGA Extension © 2012-2020. However, because the disease is sporadic in occurrence and not considered a significant economic problem, specific fungicide application for powdery mildew is not usually recommended. We commonly get requests for a single fungicide program that growers could use. In the fall, the spots turn cinnamon brown and contain small, dark fungal-fruiting bodies. If rainfall during the growing season is excessive, more than 8 sprays will be required for management of scab on susceptible cultivars, therefore, the following program serves as an example of how to accommodate this need. The UGA Pecan Team provides timely information relevant to pecan production in Georgia for use by county extension agents and pecan producers. Disease control includes the use of cultivars without extreme susceptibility to the diseases, the use of cultural practices such as adequate spacing between trees, and conscientious application of fungicides. The Pecan ipmPIPE program was organized during 2008 and winter/spring of 2009 by scientists (S-1049) and pecan producers (Pecan ipmPIPE Producer Advisory Board with representatives from pecan producer organizations) to plan, develop and launch the initial Pecan ipmPIPE Web site in April 2009. Bear in mind that we are not saying this is the best fungicide schedule possible. Basically use it on one of the pre-pollination sprays. Selecting cultivars that are resistant to pecan scab is recommended to avoid these costly sprays. A thin film of the fungicide prevents the scab fungus from developing by killing spores before they can invade susceptible tissues. But it is only effective if you begin fungicide applications when leaf buds are opening. Gary says, what we discovered is that phosphite fungicides are highly effective on leaf scab when used as stand-alone treatments. There are several other fungal diseases that can infect pecan, but they are usually controlled when using a fungicide spray program to control pecan scab. These lly demons ases. TIFTON — To protect against scab disease resistance, Georgia pecan farmers now have a new fungicide in their arsenal, according to University of Georgia plant pathologist Tim Brenneman.
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