Stripe Rust Alert April 2022
go.ncsu.edu/readext?861333
en Español / em Português
El inglés es el idioma de control de esta página. En la medida en que haya algún conflicto entre la traducción al inglés y la traducción, el inglés prevalece.
Al hacer clic en el enlace de traducción se activa un servicio de traducción gratuito para convertir la página al español. Al igual que con cualquier traducción por Internet, la conversión no es sensible al contexto y puede que no traduzca el texto en su significado original. NC State Extension no garantiza la exactitud del texto traducido. Por favor, tenga en cuenta que algunas aplicaciones y/o servicios pueden no funcionar como se espera cuando se traducen.
Português
Inglês é o idioma de controle desta página. Na medida que haja algum conflito entre o texto original em Inglês e a tradução, o Inglês prevalece.
Ao clicar no link de tradução, um serviço gratuito de tradução será ativado para converter a página para o Português. Como em qualquer tradução pela internet, a conversão não é sensivel ao contexto e pode não ocorrer a tradução para o significado orginal. O serviço de Extensão da Carolina do Norte (NC State Extension) não garante a exatidão do texto traduzido. Por favor, observe que algumas funções ou serviços podem não funcionar como esperado após a tradução.
English
English is the controlling language of this page. To the extent there is any conflict between the English text and the translation, English controls.
Clicking on the translation link activates a free translation service to convert the page to Spanish. As with any Internet translation, the conversion is not context-sensitive and may not translate the text to its original meaning. NC State Extension does not guarantee the accuracy of the translated text. Please note that some applications and/or services may not function as expected when translated.
Collapse ▲Stripe rust has appeared in eastern North Carolina. It was found yesterday in field plots of DG Shirley in Washington County. A stripe rust epidemic can develop much quicker than a leaf rust epidemic. If scouting reveals stripe rust in your field a fungicide should be applied as soon as possible to preserve yield. Wheat varieties rated susceptible (S) and moderately susceptible (MS) should be scouted immediately. Resistant (R) or moderately resistant (MR) varieties are at low risk. Apply fungicides to fields containing multiple stripe rust foci first before moving on to fields with less noticeable infections. A stripe rust focus is pictured in Figure 1B.
Figure 1. A) Stripe rust is characterized by yellow to orange lesions arranged in stripes on wheat leaves. Heads can become infected if the disease is severe. B) Stripe rust foci in a wheat field. Fields with multiple foci should be treated with fungicide first. Images courtesy of Barry Lewis (A) and Tim Britton (B).
When choosing a fungicide pay close attention to harvest restrictions on the label. Table 1 is abbreviated from NCERA 184 Fungicide Efficacy for Control of Wheat Diseases to include only fungicide products with an excellent stripe rust rating. The fungicides Prosaro, Caramba, and Folicur provide excellent protection against a stripe rust epidemic. Generic versions of the same active ingredient will provide equivalent control. These fungicides have a 30-day pre-harvest restriction so use caution when applying to fields nearing harvest. Stobilurin-only products such as Aproach and Headline are less effective when used alone after a stripe rust infection has occurred. Aproach Prima also provides excellent protection against stripe rust; however, this fungicide has a 45-day pre-harvest restriction and should only be applied to varieties that are still in boot and not yet heading. As a reminder Feekes 10.5 is heads fully emerged from the boot and Feekes 10.5.1 to 10.5.4 is the flowering stage.
Table 1. Abbreviated from NCERA-184 Fungicide Efficacy for Control of Wheat Diseases
| Class | Product |
Rate/A (fl. oz) |
Stripe rust | Harvest Restriction |
| Strobilurin | Aproach SC | 6.0 – 12.0 | E3 | Feekes 10.5 |
| Headline SC | 6.0 – 9.0 | E3 | Feekes 10.5 | |
| Quadris 2.08 SC | 4.0-12.0 | E | Feekes 10.5.4 | |
| Triazole | Caramba 0.75 SL | 10.0 – 17.0 | E | 30 days |
| Folicur 3.6 F5 | 4.0 | E | 30 days | |
| Prosaro 421 SC | 6.5 – 8.2 | E | 30 days | |
| Mixed Modes of Action | Aproach Prima SC | 3.4-6.8 | E | 45 days |
| Nexicor EC | 7.0 – 13.0 | E | Feekes 10.5 | |
| Quilt Xcel 2.2 SE5 | 10.5 – 14.0 | E | Feekes 10.5.4 | |
| Trivapro SE | 9.4 – 13.7 | E | Feekes 10.5.4 & 14 days | |
| Topguard EQ | 4.0 – 7.0 | E | Feekes 10.5.4 & 30 days |
3Efficacy may be significantly reduced if solo strobilurin products are applied after stripe rust infection has occurred.