SOYBEAN DISEASE CONTROL John D. Mueller, Extension Soybean Pathologist

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1 SOYBEAN DISEASE CONTROL John D. Mueller, Extension Soybean Pathologist Soybeans can be affected by diseases throughout the growing season. In general seedling diseases are only a problem in fields planted very early in the growing season when soil temperatures are low. They are especially prevalent if low soil temperatures are combined with very wet soils. Usually by mid May seedling diseases are no longer a problem. Seed treatment fungicides normally do a good job of controlling seedling diseases. During mid season many leaf diseases are common on soybean. Downy Mildew, Brown Spot (Septoria Blight), Cercospora Leaf Spot and Frogeye Leaf Spot are very common and stem diseases such as Pod & Stem Blight and Anthracnose are common from midseason to harvest in wet years. Soybean Rust is active in South Carolina primarily after mid August in most years. Soybean varieties vary greatly in their susceptibility to diseases such as Frogeye Leaf Spot. Choosing a resistant variety is much more cost effective than fungicide applications. s are available that can help with many of these diseases. It is important to accurately identify the diseases you are trying to control as not all diseases can be controlled by all fungicides. Check the label of individual fungicides or your South Carolina Soybean Production Guide for information on accurate identification of diseases based on field symptoms. In general South Carolina soybeans should not be sprayed for disease control until after they flower. This is true whether Soybean Rust or other diseases are the target. Wet weather increases the severity of most fungal diseases and the subsequent need for a fungicide. Spraying a fungicide in dry weather is often unnecessary. Foliar diseases tend to respond well to fungicide applications. Stem diseases such as Charcoal Rot are more difficult to control and lower stem diseases such as Red Crown Rot (CBR) and Southern Blight (White Mold) are almost impossible to control with fungicides. 256

2 FUNGICIDES AVAILABLE FOR CONTROLLING SEEDLING DISEASES ON SOYBEAN Product Active Ingredient Fungi Controlled Rate Allegiance Dry Metalaxyl 12.5% oz. per cwt. Allegiance FL Metalaxyl 28.35% fl. oz. per cwt Allegiance LS Metalaxyl 17.7% fl. oz. per cwt. Apron XL LS Metalaxyl M and S isomer 33.3% ApronMaxx RFC Mefenoxam 3.46% + Fludioxonil 2.31% ApronMaxx RTA Mefenoxam 1.01% + Fludioxonil 0.73% ApronMaxx RTA + Moly Mefenoxam 1.02% + Fludioxonil 0.68% + Molybdenum 4.67% Bean Guard/Allegiance Carboxin 12.5% Metalaxyl 3.75% Captan 24.45% 11.9% molybdenum CruiserMaxx Mefenoxam 1.7% + Fludioxonil 1.12% + Thiamethoxam 22.6% CruiserMaxx Advanced Mefenoxam 3.21% + Fludioxonil 1.07% + Thiamethoxam 21.5% Dynasty Azoxystrobin 9.6% Enhance Captan 19.55% + Carboxin 20.0% Rhizoctonia solani Rhizoctonia solani Phytophthora spp., Pythium spp.,, Pythium spp., Equation Azoxystrobin 22.8% EverGol Energy SB Prothioconazole 7.18% Penflufen 3.59% Metalaxyl 5.74% fl. oz. per cwt. 1.5 fl. oz. per cwt. 5.0 fl. oz. per cwt. 5.0 fl. oz. per cwt. 2.0 oz. per 60 lbs fl. oz. per cwt. 3.1 fl. oz. per cwt fl. oz. per cwt. 5.0 oz. per cwt fl. oz. per 1000 ft. row 1.0 fl. oz per cwt Evito 480 SC Fluoxastrobin 40.3% fl. oz. per 1000 ft. row Headline SC fungicide Pyraclostrobin fl. oz. per 1000 ft. of row ILeVO fluopyram Fusarium viguliforme 1.18 to 1.97 fl. oz. per 140,000 soybean seed 257

3 FUNGICIDES AVAILABLE FOR CONTROLLING SEEDLING DISEASES ON SOYBEAN (CONTINUED) Product Active Ingredient Fungi Controlled Rate Innovate Seed Protectant Ipconzaole 0.72% Metalaxyl 1.15% 4.74 fl. oz. per cwt. Clothiandin 14.3% Maxim 4FS Fludioxonil 40.3% Rhizoctonia fl. oz. per cwt. Prevail Carboxin 15% + PCNB 15% + Metalaxyl 3.12% Priaxor Fluxapyroxad 14.33% + Pyraclostrobin 28.58% solani suppression suppression oz. per bushel 0.2 to 0.6 fl. oz. per 1000 ft. row in furrow Ridomil Gold SL Mefenoxam 45.3% fl. oz. /1000 ft. row in furrow Ridomil Gold GR Mefenoxam 2.5% oz. per 1000 ft. of row in furrow Trilex Flowable Trifloxystrobin 22% 0.32 fl oz per cwt Trilex 2000 Trifloxystrobin 7.12% Metalaxyl 5.69% 1.00 fl. oz. per cwt. Vibrance Sedaxane 43.7% fl. oz. per cwt Vitavax 34 Seed Carboxin 34% 3 4 fl. oz. per cwt. Treatment Vitavax CT Flowable Carboxin 5.7% 12.0 fl. oz. per cwt. Thiram 5.7% Vitavax M Flowable Carboxin 5.7% Thiram 5.7% 12.0 fl. oz. per cwt. Molybdenum 2.9% Vitavax MDC Captan 23.9% + Carboxin Warden RTA Mefenoxam 2.21 % Fludioxonil 0.72% 12.5% + Molybdenum 10% 2.0 oz. per bushel 5.0 fl. oz. per cwt Do not use treated seed for food, feed or oil purposes. Do not graze or feed livestock on forage or hay grown from treated soybean seed. All treated seed must be colored with an EPA approved dye which imparts an unnatural color to the seed to help prevent the inadvertent use of treated seed as food for man or feed for animals. 258

4 FOLIAR FUNGICIDES FOR USE ON SOYBEAN IN SOUTH CAROLINA 1 No. of appl. /year & max. Product Active Ingredient Rate /year Disease Controlled Affiance Azoxystrobin (28.7) Rust + other diseases Tetraconazole Aftershock Fluoxastrobin 2.7 to 5.7 fl. oz. 2(11.4) Rust + other diseases Alto 100SL Cyproconazole (11) Rust + other diseases Aproach Picoxystrobin (36) Rust + other diseases Aproach Prima Picoxystrobin + Cyproconazole (13.6) Rust + other diseases Cercobin Thiophanate methyl (43.6) For other diseases Will not control rust CUSTODIA Azoxystrobin + Tebuconazole 8.6 3(25.9) Rust + other diseases Domark 230 ME Tetraconazole (10) Rust + other diseases Endura Boscalid (22) Alternaria leaf spot + other diseases. Not for rust Equation SC Azoxystrobin (92.3) Rust + other diseases Evito 480 SL Fluoxastrobin (11.4) Rust + other diseases Evito T Fluoxastrobin (11.4) Rust + other diseases Tebuconazole Folicur 3.6 SC Tebuconazole (12) Rust + powdery mildew Fortix Fluoxastrobin (12) Rust + other diseases Flutriafol Gem RC Trifloxystrobin (10.5) Rust + other diseases Orius 3.6 SC Tebuconazole (12) Rust + powdery mildew Tebuzol 3.6 F Tebuconazole (12) Rust + powdery mildew Headline Pyraclostrobin (24) Rust + other diseases Headline SC Pyraclostrobin (24) Rust + other diseases Priaxor XEMIUM BRAND FUNGICIDE Fluxapyroxad Pyraclostrobin (16) Rust + other diseases Proline 480 SC Prothioconazole (9) Rust + Powdery mildew Quadris Flowable Azoxystrobin (92) Rust + other diseases Quadris Top SB Azoxystrobin (26.5) Rust + other diseases Difenoconazole Quadris Xtra 280 SC Azoxystrobin + Cyproconazole (13.6) Rust + other diseases Quilt Azoxystrobin + Propiconazole (42) Rust + other diseases 259

5 FOLIAR FUNGICIDES FOR USE ON SOYBEAN IN SOUTH CAROLINA 1 (Cont.) Product Active Ingredient Quilt Xcel Azoxystrobin + Propiconazole No. of appl. /year & max. Rate /year Disease Controlled (42) Rust + other diseases Stratego 250 EC Propiconazole + Trifloxystrobin Stratego YLD Prothioconazole + Trifloxystrobin (20) Rust + other diseases (13.95) Rust + other diseases Tilt 250 EC Propiconazole (12) Rust + other diseases Bumper 41.8 EC Propiconazole (12) Rust + other diseases Topguard Flutriafol (14) Rust + other diseases Topsin XTR Thiophanate methyl + Tebuconazole 20 See label Rust + other diseases TOPSIN 4.5 FL Thiophanate methyl (40) Other diseases WILL NOT TOPSIN M 70 WP Thiophanate methyl lbs./acre 2 (2 lbs) Other diseases WILL NOT Topsin M WSB Thiophanatemethyl lbs/acre 2 (2 lbs) Other diseases WILL NOT Vertisan Penthiopyrad (61) Rust + other diseases 1For a list of specific diseases controlled by each fungicide please see a product label. PRODUCTS CONTAINING CHLOROTHALONIL FOR THE CONTROL OF RUST AND OTHER FOLIAR DISEASES OF SOYBEAN 1 Product Formulation Rate per acre Maximum total/year Bravo Weather Stik Flowable fl. oz. (3 appl.) fl. oz. (2 appl.) Bravo Ultrex Dry flowable lbs. (3 appl.) 5.4 lbs lbs. (2 appl.) Echo 720 Flowable fl. oz. (3 appl.) fl. oz. (2 appl.) Echo 90DF Dry flowable lbs. (3 appl.) 4.4 lbs lbs. (2 appl.) Equus 720 SST Flowable fl. oz. (3 appl.) fl. oz. (2 appl.) Equus DF Dry flowable lbs. (3 appl.) 5.4 lbs lbs. (2 appl.) 1For a list of specific diseases controlled by each fungicide please see a product label. 260

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