The Environmental Protection Agency has approved new labels for the use of Quadris fungicide on soybeans, cotton, various root, bulb and leafy vegetable crops, and for in-furrow and banded applications to control soilborne diseases. Quadris, manufactured by Syngenta, has previously been registered for controlling major fungal diseases in cucurbits, tomatoes, rice, wheat, canola and potatoes as a foliar spray.

Powerful control

“Quadris provides powerful control of a broad spectrum of diseases, resulting in healthy, high-quality crops,” said Jim Frank, fungicides technical brand manager for Syngenta. He emphasized that Quadris should be applied prior to disease development for optimum control.

In soybeans, Quadris should be used for foliar application at a rate of 6.2 ounces to 15.4 ounces per acre for control of aerial blight, and 12.3 ounces to 15.4 ounces per acre for control of anthracnose, altemaria leaf spot, brown spot, cercospora blight and leaf spot, pod and stem blight, and southern blight.

Rate considerations

The higher rates should be used under conditions favorable for severe disease pressure, dense plant canopies, or when susceptible varieties are planted.

No more than two applications of Quadris should be made per growing season.

Quadris can be applied in-furrow in cotton to control rhizoctonia seedling blight and pythium seedling blight. Syngenta recommends applying Quadris at a rate of 0.4 ounces to 0.6 ounces per 1,000 feet of row. The higher rate should be used when weather conditions are conducive to disease development, if the field has a history of disease problems, or if minimum or low-till programs are in place.

Only one application of the material may be made per each use season.

Quadris controls several leaf spots, rust, powdery mildew, root rot, circular spot and rhizoctonia stem canker in sugar beets, carrots, horseradish and other root and tuber crops. The product should be used for foliar application at 6.2 ounces to 15.4 ounces per acre, depending on the disease and severity of infection.

A maximum of six applications of Quadris may be made per acre each year.

For garlic, leeks, onions and other bulb vegetables, Syngenta recommends using Quadris for foliar application at a rate of 6.2 ounces to 12.3 ounces per acre for control of purple blotch, rust and white rot. To control downy mildew and rhizoctonia damping-off, Quadris should be applied at 9.2 ounces to 15.4 ounces per acre. A maximum of six applications of Quadris may be made per acre each year.

In celery, lettuce, spinach and other leafy vegetables, Quadris should be applied as a foliar spray at 6.2 ounces to 15.4 ounces per acre to control diseases such as leaf spot, mildew, anthracnose and white rust. Quadris can also be used to control soilborne diseases such as rhizoctonia root rot.

A maximum of six foliar applications of Quadris may be made per acre per year.

Quadris can now be applied to potatoes in-furrow to control silver scurf and various stages of rhizoctonia including black scurf. Syngenta recommends applying Quadris in-furrow at a rate of 0.4 ounce to 0.6 ounce per 1,000 feet of row.

Other changes

Quadris has been labeled for foliar application since 1999 to control early and late blight. Black dot and powdery mildew have also been added to the label.

A maximum of six foliar applications of Quadris may be made per season.

Quadris has a signal word of “caution” and a re-entry interval of four hours. It can be applied by ground, air or chemigation, and can be tank-mixed with most fungicides and insecticides.

An adjuvant may be added at recommended rates to improve coverage. Use caution with regard to adjuvants and tank-mixes when treating spinach and lettuce.

Excellent fit

Quadris is an excellent fit in fungicide resistance management programs. “The active ingredient of Quadris, azoxystrobin, belongs to a new class of chemistry called strobilurins that offers a unique mode of action for controlling fungal diseases,” explained Frank. “Quadris can be easily integrated into treatment programs with Bravo and other fungicides that have a different mode of action.”

The product label offers specific resistance management strategies for each crop.

State registrations for the use of Quadris on bulb vegetables, root and tuber vegetables, leafy vegetables, soybeans, cotton, and approval of in-furrow application in potatoes are pending in Wisconsin, New York, California and Florida.