The Environmental Protection Agency has issued a Section 18 quarantine exemption registration for the use of Syngenta Crop Protection's Alto fungicide, containing the active ingredient cyproconazole, in soybeans to control soybean rust (Phakopsora pachyrhizi).

The Section 18 exemption for Alto allows growers to apply the fungicide to control soybean rust in Minnesota and South Dakota, the first of 19 states to receive approval after requesting a Section 18 quarantine exemption from EPA.

Alto, a new triazole tank-mix partner for Quadris, provides excellent curative control of soybean rust. During use in South America, cyproconazole has shown that its improved triazole chemistry controls soybean rust as well as or better than currently used triazole fungicides, according to Syngenta. With rapid fungicide uptake and flexible application timing, Alto makes treatment fast and convenient.

“Soybean rust is a highly destructive pathogen,” said Marty Wiglesworth, technical fungicide brand manager with Syngenta Crop Protection. “In the case of a soybean rust outbreak, a grower can lose 60 to 80 percent of yield from early defoliation and poor pod-fill without a properly timed fungicide. Alto prevents yield loss, providing rust control with little chance of leaf burning.”

A combination of Quadris and Alto will provide the longest-lasting residual disease control to protect against rust while enhancing soybean yields and quality, according to Syngenta.

“For the best protection against soybean rust, a tank-mix of Quadris and Alto should be used as a preventive treatment,” recommends Wiglesworth. “Our research has shown that the first point a grower should consider a soybean rust fungicide spray would be at the R1/R2 stage should the risk for rust be high.”

Growers in areas granted a Section 18 should contact their local retailers or Syngenta representatives for use rates, application timing and other product information.

Requests on behalf of several states have been submitted to include Alto on EPA's approved Section 18 list for control of Asian rust on soybeans. The following states have requested an Alto Section 18 quarantine exemption from EPA: Alabama, Colorado, Delaware, Iowa, Illinois, Indiana, Kansas, Kentucky, Maryland, Minnesota, Missouri, Mississippi, North Carolina, Nebraska, New Jersey, Oklahoma, South Carolina, South Dakota, and Texas.