Effective chemical tools for enhanced disease resistance management In order for resistant genetics to thrive the proper use of chemistries is imperative. Fungicide rotations prescribed to prevent IDM in Impatiens walleriana may also help protect from other serious fungal pathogens that they’re susceptible to, including Pythium, Phytophthora, Rhizoctonia, Thielaviopsis, Myrothecium, Alternaria and Botrytis . For these reasons, base level preventive fungicide applications are recommended during propagation and finished production for general sanitary and stewardship reasons. It’s important to understand the pathogens that a crop was specifically bred to resist against and that “disease resistance” does not imply a resistance to all diseases it could get infected by. By principal, plant pathologists emphasize that in order to properly fight a disease you must diagnose the specific pathogen first. This practice not only allows you to choose the proper chemical treatment but also the most appropriate genetics to produce.
Syngenta Flowers has a vast online library of information available for these treatment options and many technical experts that can provide suggestions and rotation schedules. Rotation of active ingredients is the key to crop protection and demonstrates best disease resistance management practices. Nancy Rechcigl, Technical Services Representative for Syngenta’s Turf and Ornamental Controls business, suggests a systemic sandwich for effective management of the disease—chemistries applied during plug production/at transplant and before shipping to retail centers. For an effective and specialist prescribed agronomic program with multiple rotation active ingredients please visit the GreenCast Online Website.
Measuring Genetic Performance In order to see the true genetic performance, all breeding and selection work for Imara ® XDR and Cora ® XDR was done without preventive chemistries. Syngenta Flowers stands strongly behind our message of resistance, and the collective expertise suggests continuing to safeguard these important classes by taking a more steady and responsible approach to maintaining genetic disease resistance through coupling with preventive chemistries.
This program contains a fairly new FRAC group 49 fungicide tool called Segovis ® . This fungicide offers a unique mode of action to diversify rotation programs and protect impatiens for up to 12 weeks when applied as a drench as the final treatment prior to shipping. Segovis ® has been encouraged by Extension Plant Pathology Specialists Dr. Mary Hausbeck, Michigan State University and Dr. Margery Daughtrey, Cornell University.
Impatiens Downy Mildew Trials Vero Beach, Florida
Existing Commercial Variety
Transplanted and inoculated with Downy Mildew on March 1, 2018. Photographed on April 30, 2018. Imara ® XDR Red
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