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What is Cercospora Leafspot? How does BEETcast work? Risk Management - Spray Chart Fungicide Effectiveness |
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Risk Management - Spray ChartYour BEETcast™ spraying interval recommendation is based on your VARIETY and LOCATION.
2010 Cercospora Spray Program Recommendations for Ontario Janice LeBoeuf, OMAFRA, Vegetable Crop Specialist The BEETcast program ensures that you get the most out of the dollars you spend on disease control by suggesting the most effective timing of fungicide applications for Cercospora leafspot. You can tailor-make your spray program based on the level of risk management you are comfortable with. Growers have asked if their fungicide spray programs should be altered for varieties with lower resistance to Cercospora leafspot. In the development of BEETcast, the susceptible sugarbeet variety E17 was used to determine the spray timing intervals. Research by the Michigan Sugar Company has indicated that several of the susceptible newer varieties are comparable in susceptibility to E17 from which BEETcast was developed. With that in mind, we believe the current spray timings are still valid. It is very important to use BEETcast to make sure that your first and most effective spray application is properly timed, especially for susceptible sugarbeet varieties. Key Steps
1. Rotate fungicide groups. Never, ever use Headline back to back, Senator back to back, or Proline back to back. Rotate between the products.
2. Select varieties with resistance to Cercospora leafspot, if possible. 3. Be on time with your first application of the season. It is the most valuable spray. Currently your choice of spray materials is limited compared with your co-op colleagues in the US. Recognizing what is registered in Canada, it is recommended that you start your fungicide spray program with Headline, unless Quadris was applied earlier in the season for rhizoctonia. Both Quadris and Headline are in the strobilurin family of fungicides. If Quadris has already been applied for rhizoctonia, then choose Proline for your first Cercospora application. Follow BEETcast to time this application correctly. 4. Use BEETcast to ensure that subsequent fungicide applications are also timely. 5. Try to use each fungicide class only once in your Cercospora spray program. If the program was started with Headline, then Proline is a good choice for your second application. If Proline was used first, Headline can be used for the second application. Senator should be used if a third application is required, but it is recommended that Senator be tank-mixed with mancozeb, metiram, or copper fungicides for resistance management. Do not use Senator more than once per season. Rotate to Headline or Proline if additional applications are required. 6. Use at least 20 gpa (preferably 30 gpa) of water for fungicide application. 7. Scout your fields often during Cercospora season to monitor disease development and fungicide effectiveness. Proline, Headline, and Senator are in different chemical families, so there is no reason to use any of them back to back. Please rotate between them to help maintain their effectiveness. As new products are registered, we will still need the existing products for resistance management. OMAFRA and Michigan Sugar Company will keep growers updated on new registrations.
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| Inspire XT: state disclaimer – Inspire XT is not currently registered for sale or use in all states. Please check with your local extension service before buying or using this product. |
