PEANUT SEEDLING DISEASES (Commercial Production) PEANUT NEMATODES (Commercial Production)
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1 PEANUT SEEDLING DISEASES (Commercial Production) Disease Rate/cwt Seed Commercial Seed Treatments Rhizoctonia solani and Dynasty PD azoxystrobin + mefenoxam + fludioxonil oz Maxim 4 FS fludioxonil oz CruiserMaxx Peanuts thiamethoxam + mefenoxam + fludioxonil + azoxystrobin oz Rancona V PD ipconazole + carboxin + metalaxyl oz Pythium Apron XL mefenoxam oz In-Furrow or Band Applications Rhizoctonia solani and Southern Blight Uniform azoxystrobin + mefenoxam oz/row ft At planting. Proline prothioconazole oz/a Apply 4- to 6-inch band over the row at or near emergence. PEANUT NEMATODES (Commercial Production) Disease Nematicide Rate Per Acre Nematodes Velum Total fluopyram 18 fl oz Apply as in-furrow spray with 5-6 gal/ac water at planting. Telone II 1,3-dichloropropene 4-6 gal Inject 12 inches below the soil surface. Allow 2 weeks before planting. Nematodes are not currently a serious threat to peanut production in Arkansas; therefore, we do not routinely recommend nematicides, even though certain products are labeled for this use. The peanut root-knot nematode is extremely rare in the state. It is possible, however, that other nematode species such as the lesion nematode or the ring nematode may reach economic levels in some fields. If nematodes are suspected, soil samples should be collected in the fall (September-October) and sent to the Nematode Diagnostic Laboratory for analysis before the next crop is planted. 103
2 PEANUT DISEASES (Commercial Production) Disease Seedling Diseases Aspergillus crown rot (Aspergillus niger) Rhizoctonia solani Abound 2.08 SC (multiple generics) azoxystrobin fl oz/ 1,000 row ft 14 Apply as in-furrow at planting. Leaf Spots Chemical Control of Leaf Spot Diseases: 1. In any given field, circular-shaped spots can be found on peanut leaves; however, these spots may not be caused by the leaf spot pathogens. Sporulation (fuzzy tufts of fungal structures) can be seen with the aid of a hand lens on the upper leaf surfaces for ELS and lower leaf surface for LLS. 2. s on peanut are applied to prevent leaf spot disease development, which typically begins 60 days after planting, when conditions favor disease development. programs consist of repeated applications at day intervals depending on disease development and weather conditions. 3. Apply fungicides with sufficient water volume (15 to 20 GPA) to adequately cover foliage. 4. Do not make consecutive applications of the same mode of action (i.e., same code number) except for those applications that contain chlorothalonil in a cropping season. It is recommended to tank mix fungicides with a single mode of action with chlorothalonil. Early leaf spot (Cercospora arachidicola) Late leaf spot (C. personatum) Web blotch (Phoma arachidicola) and Rust (Puccinia arachidis) Cercobin thiophanate-methyl fl oz 14 Very good activity on leaf spot diseases. ALWAYS mix with chlorothalonil. Topsin, T-Methyl 70 W thiophanate-methyl 1 8 oz 14 Topsin, T-Methyl 4.5 F thiophanate-methyl 1 10 fl oz 14 Thiophanate Methyl 85 WDG thiophanate-methyl oz 14 Alto 100 SL cyproconazole fl oz 30 Good activity on leaf spots. Topguard 1.04 SC flutriafol fl oz 14 Quash 50 WDG metconazole fl oz 14 Tilt 3.6 E (multiple generics) propiconazole 3 4 fl oz 14 tebuconazole 3.6 F (multiple generics) tebuconazole fl oz 14 Good activity on leaf spots. Eminent 125 SL tetraconazole 3 13 fl oz 14 Good activity on leaf spots. Fontelis 1.67 SC penthiopyrad fl oz 14 Good activity on leaf spots. Abound 2.08 SC (multiple generics) azoxystrobin fl oz 14 Evito 480 SC (multiple generics) fluoxastrobin fl oz 14 (continued) Headline 2.09 SC pyraclostrobin fl oz 14 Very good activity on leaf spots. 104
3 Disease Leaf Spots (cont.) Early leaf spot (cont.) (Cercospora arachidicola) Late leaf spot (C. personatum) Web blotch (Phoma arachidicola) and Rust (Puccinia arachidis) Bravo Weather Stik, Chlorothalonil, Echo 6 F PEANUT DISEASES (Commercial Production) continued chlorothalonil M pt 14 Very good activity on leaf spots when applied prior to disease development. Use high rate when applied alone or low rate in tank mix. Bravo Ultrex, Chlorothalonil 82.5 DF chlorothalonil M lb 14 Acropolis 2.38 F thiophanate-methyl + tetraconazole fl oz 14 Provost 433 SC prothioconazole + tebuconazole fl oz 14 Very good activity on leaf spot diseases. Topguard EQ 4.0 SC azoxystrobin + flutriafol fl oz 14 Evito T 4 F fluoxastrobin + tebuconazole fl oz 14 Stratego 2.08 SC trifloxystrobin + propiconazole fl oz 14 Absolute 500 SC trifloxystrobin + tebuconazole fl oz 14 Priaxor 4.17 SC pyraclostrobin + fluxapyroxad fl oz 14 Tilt Bravo SE 4.3 F chlorothalonil + propiconazole M pt 14 Muscle ADV 3.84 SC chlorothalonil + tebuconazole M pt 14 Echo 6 F Eminent 125 SL Co-Pack chlorothalonil + tetraconazole M pt 14 Mazinga ADV 3.23 SC chlorothalonil + tetraconazole M pt 14 Arius ADV 6.65 SC chlorothalonil + azoxystrobin M fl oz 14 Soilborne Diseases Chemical Control of Soilborne Peanut Diseases: 1. Southern blight is the most common soilborne disease of peanut in Arkansas, which is most active when weather conditions are hot and humid. 2. s on peanut are applied to prevent soilborne disease development, which typically begins 60 days after planting, when conditions favor disease development. programs consist of repeated applications at day intervals depending on disease development and weather conditions. 3. Apply fungicides with sufficient water volume (15 to 20 GPA) to penetrate canopy or before rainfall. Applications at night when leaves are folded have been shown to improve fungicide penetration into the lower canopy. 4. Do not make consecutive applications of the same mode of action (i.e., group number) except for those applications that contain chlorothalonil. Southern blight Quash 50 WDG metconazole fl oz 14 Very good activity on southern blight. Tilt 3.6 E (multiple generics) propiconazole fl oz tebuconazole 3.6 F (multiple generics) tebuconazole fl oz 14 Very good activity on southern blight. Convoy 3.8 F flutolanil fl oz 40 Excellent activity on southern blight. (continued) Fontelis 1.67 SC penthiopyrad fl oz 14 Excellent activity on southern blight. 105
4 Disease Soilborne Diseases (cont.) Southern blight (cont.) PEANUT DISEASES (Commercial Production) continued Abound 2.08 SC (multiple generics) azoxystrobin fl oz 14 Good activity on southern blight. Headline 2.09 SC pyraclostrobin fl oz 14 Combine with triazole or flutolanil for effective southern blight control. Provost 433 SC prothioconazole + tebuconazole fl oz 14 Prothioconazole has very good activity on southern blight. Evito T 4 F fluoxastrobin + tebuconazole fl oz 14 Absolute 500 SC trifloxystrobin + tebuconazole fl oz 14 Priaxor 4.17 SC pyraclostrobin + fluxapyroxad fl oz 14 Good activity on southern blight. Muscle ADV 3.84 SC chlorothalonil + tebuconazole M pt 14 Very good activity on southern blight. Limb rot (Rhizoctonia solani) Arius ADV 6.65 SC chlorothalonil + azoxystrobin M fl oz 14 Quash 50 WDG metconazole fl oz 14 tebuconazole 3.6 F (multiple generics) tebuconazole fl oz 14 Good activity on Rhizoctonia Convoy 3.8 F flutolanil pt 40 Very good activity on Rhizoctonia Fontelis 1.67 SC penthiopyrad fl oz 14 Very good activity on Rhizoctonia Abound 2.08 SC (multiple generics) azoxystrobin fl oz 14 Excellent activity on Rhizoctonia Headline 2.09 SC pyraclostrobin fl oz 14 Combine with triazole or flutolanil for effective Rhizoctonia limb rot control. Acropolis 2.38 F thiophanate-methyl + tetraconazole fl oz 14 Provost 433 SC prothioconazole + tebuconazole fl oz 14 Evito T 4 F fluoxastrobin + tebuconazole fl oz 14 Absolute 500 SC trifloxystrobin + tebuconazole fl oz 14 Muscle ADV 3.84 SC chlorothalonil + tebuconazole M pt 14 Arius ADV 6.65 SC chlorothalonil + azoxystrobin M fl oz
5 PEANUT DISEASES (Commercial Production) continued Disease Soilborne Diseases (cont.) Endura 70 WG boscalid oz 14 Sclerotinia blight (Sclerotinia minor) (S. sclerotiorum) Omega 500 F fluazinam pt 30 Fields with a history of Sclerotinia blight should be treated beginning 60 to 70 days after planting or when conditions favor disease. Pod Rots Pytium spp. Rhizoctonia solani Ridomil Gold SL mefenoxam fl oz See label. Pythium rot only. Apply at pegging or early pod set (45 to 60 DAP) followed by irrigation. Metastar 2 E metalaxyl pt Pythium rot only. Ridomil Gold 2.5 G mefenoxam lb See label. Pythium rot only. Apply in 12-inch band at pegging or early pod set (45 to 60 DAP). Abound 2.08 SC (multiple generics) azoxystrobin fl oz 14 Suppress Rhizoctonia pod rots. Apply 60 to 70 DAP. Do not make more than 2 sequential applications of group 11 fungicides. Fosphite 3.9 L, KPhite 4.4 L phosphorus acid qt 14 Pythium rot only. Apply at pegging (45 DAP) followed by irrigation. PEANUT DISEASES (Commercial Production) AFLATOXIN Contamination Biological Product Rate/A Aflatoxin Contamination by Aspergillus flavus Afla-Guard Atoxigenic strain of A. flavus 20 lb Apply by ground days after planting or canopy closure. Note: Aflatoxin has not been an issue in Arkansas peanut production because the crop is 100% irrigated. 107
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