Cucumber Downy Mildew Detected in North Carolina
go.ncsu.edu/readext?607458
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 ▲Written by Lina Quesada-Ocampo and Kimberly D’Arcangelo
Cucumber Downy Mildew (CDM) was confirmed on a cucumber sample from a production field in Wilson County. Leaves displayed approximately 10% disease, but only 5% of the field was affected.
Characteristic symptoms include angular, chlorotic lesions on the upper surface of cucurbit leaves and gray sporulation on the underside of the leaves. Sporangiophore structures typical of Pseudoperonospora cubensis, causal agent of CDM, can be observed using a hand lens or under a dissecting microscope.
North Carolina growers are advised to take immediate preventative action to protect cucurbit crops. Growers are encouraged to read our Cucurbit Downy Mildew fact sheet and our annual demonstration trials for the latest fungicide recommendations. Effective fungicides can also be found in the Southeastern US Vegetable Crop Handbook. This pathogen quickly becomes resistant to fungicides and therefore it is critical to make sure fungicide groups within products are alternated and tank mixes are utilized to minimize the generation of fungicide-resistant isolates. Cucumbers and cantaloupes are generally more susceptible to the disease than squash, watermelon, and pumpkin.
Because this is an airborne pathogen that can travel from state to state, controlling CDM remains a community effort. We encourage growers and homeowners to actively and continuously scout cucurbit leaves for downy mildew and report findings of the disease to the Cucurbit Downy Mildew IPM PIPE (CDM ipmPIPE). Reports remain anonymous and are crucial in warning growers throughout the East Coast of outbreaks. No specific information needs to be provided to submit a report other than the host crop affected and the county. Also, consider registering to receive texts, emails and/or phone alerts when new disease outbreaks are reported from the CDM ipmPIPE site.
If you believe you may have CDM in your cucurbits, please contact your local Extension Agent to assist in diagnosis. Agents may also help you send a sample to the Plant Disease and Insect Clinic if a confirmation is necessary.