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New scab fungicide approved by Environmental Protection Agency

Agriculture.com Staff 07/21/2008 @ 10:06am

Cereal growers have recently faced significant challenges with rust and scab, caused by the fungal pathogen Fusarium graminearum. These economically damaging leaf diseases result in reduction in yields, market grade and crop quality, said Randy Myers, Bayer CropScience Fungicide Portfolio Manager.

A new fungicide option, Prosaro, received registration from the U.S. Environmental Protection Agency. The fungicide is manufactured by Bayer CropScience and will be available for use during the 2009 growing season.

"Cereal growers must preserve crop quality and marketability in order to meet grain contract specifications, avoid discounts and achieve the greatest potential for their crop," said Meyers. "It offers the best available scab activity which contributes to increased grain quality and yield. Prosaro is proven to reduce deoxynivalenol levels, reducing the impact of scab on the marketability of the grain."

Prosaro acts as wheat and barley disease control, providing activity on scab while controlling foliar diseases. Among the foliar diseases controlled on wheat are leaf rust, stem rust, Septoria leaf and glume blotch, and tan spot. Barley leaf diseases controlled include net blotch, spot blotch, rusts, and scald.

Specific to leaf disease control, Prosaro contains active ingredients that penetrate the leaf and are redistributed throughout the tissues, protecting both upper and lower leaf surfaces. According to Myers, the infection process is stopped when the pathogen comes in contact with the fungicide.

"The curative action of Prosaro halts the spread of leaf diseases to healthy plant tissue, and its residual activity protects the leaf from new infections," said Meyers.

The Bayer CropScience-recommended application rates for Prosaro are 6.5 ounces per acre under normal conditions, and 8.2 ounces per acre under high disease pressure. For optimal scab activity on wheat, Prosaro should be applied at Feekes growth stage 10.51. The appropriate Feekes growth stage for scab suppression on barley is 10.5. In areas not threatened with scab infections, Prosaro may be applied at earlier growth stages for control of yield-limiting foliar diseases.

Cereal growers have recently faced significant challenges with rust and scab, caused by the fungal pathogen Fusarium graminearum. These economically damaging leaf diseases result in reduction in yields, market grade and crop quality, said Randy Myers, Bayer CropScience Fungicide Portfolio Manager.

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