Today is Sunday, September 7 2008

DSV Map GDD Map Rain Map Introduction Spray Chart Cercospora Cercospora Risk Management Cultivar Resistance Control Strategies

How it works Dr. Ron Pitblado of Weather INnovations Incorporated has developed an advisory system that utilizes air temperature and leaf wetness to help growers decide when to apply fungicides for the control of Cercospora leafspot in sugarbeets. The program is delivered to producers by Weather INnovations Incorporated (WIN). BEETcast rates each day on a scale of 0 to 4 with a value of 4 indicating the weather conditions were very favourable for the disease while a 0 indicates that either the number of hours the leaves were wet was low or the temperature was too cool for the leafspot disease to grow. These daily disease severity values (DSVs) are accumulated daily until a threshold is reached, indicating a spray application is appropriate. You then zero your counter and apply additional sprays based on the next interval of cumulative DSVs. This program maximizes the dollars spent on disease control by suggesting the most effective timing of fungicide applications. Critical information is provided by WIN in a timely manner over the internet. This information can be immediately used by growers to make informed decisions. Growers can tailor-make their spray program based on any level of risk management they are comfortable with. A fungicide spray program for the control of Cercospora leafspot is based on: Level of cultivar or varietal genetic resistance - talk to your fieldman Disease pressure based on crop rotation or proximity to other sugarbeet fields Choice of fungicides available - relative effectiveness of the products used Spray coverage - application techniques Level of disease control desired - a personal decision Favorable weather conditions that promote leafspot disease WIN can help indicate the critical spray dates based on "favorable weather conditions" through its extensive weather station network, but only the grower can determine the other factors. BEETcast helps but GROWERS make the decisions

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