Pest Alert: North Carolina Pest Alert for Spring 2013 Impatiens Downy Mildew
go.ncsu.edu/readext?282847
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 ▲Date: April 11, 2013
From: Kelly Ivors, Extension Plant Pathologist
Impatiens downy mildew was recently identified in a Virginia greenhouse in mid-January 2013 on impatiens cuttings taken from plants originally obtained from a North Carolina greenhouse in December 2012. Based on information from prior years, the 2013 impatiens downy mildew situation in our area is predicted to remain problematic. However, what time of year it shows up in the landscape and the level of downy mildew severity will depend on local weather conditions and how the ‘winds blow’. Downy mildew of impatiens is caused by the fungus-like organism Plasmopara obducens. The group of organisms that cause downy mildew diseases are more closely related to the well-known plant pathogens Phytophthora and Pythium than they are to true fungi. This is an important distinction because many of the traditional fungicides used to control fungal diseases of plants do not have efficacy against the downy mildews. All types of propagated Impatiens walleriana, including double impatiens and mini-impatiens, and any I. walleriana interspecific hybrids, such as Fusion® impatiens, are susceptible to downy mildew; however, all New Guinea impatiens (I. hawkeri) and interspecific hybrids such as SunPatiens® are immune to impatiens downy mildew. No other bedding plants are known hosts of this particular downy mildew, although there are a few other downy mildew species that specifically attack other floriculture plants like coleus and basil. Given the high plant mortality associated with epidemics of impatiens downy mildew, everyone growing impatiens should be treating with fungicides preventatively, because once it starts it is very difficult, if not impossible, to control. However, fungicide treatments are not recommended for plants in the landscape; instead, all infected impatiens should be pulled from the landscape and destroyed. Fungicides are not always 100% effective at eliminating the disease. Allowing infected plants to remain in the landscape may allow the pathogen to overwinter as resting structures (called oospores), which can start a new epidemic later in the year or in following years if impatiens are replanted in the area. New Guinea impatiens, coleus, begonia, or other available bedding plants are safe to reset in the affected area. A number of plant pathologists have been researching this disease to provide science-based information to greenhouse growers, plant retailers, landscapers and home gardeners.