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Posted 27 March 2012. PMN Crop News.

In-Field Research Shows Disease Control, Yield Advantages of Priaxor Fungicide and Merivon Fungicide From BASF

Positive research results over three years validate benefits of new products

Source: BASF Crop Protection Press Release.

Nashville, Tennessee (March 1, 2012)--With the results of field trials from the 2011 season now available, three years of research show Priaxor fungicide and Merivon® fungicide provided effective disease control and consistent yield increases in a wide range of crops. Priaxor and Merivon are expected to receive U.S. Environmental Protection Agency (EPA) registration in 2012.


Priaxor research was conducted on row crops – focusing primarily on soybeans – as well as on some specialty crops, such as potatoes and tomatoes. Merivon research was conducted on specialty crops, specifically pome and stone fruits.

“Three years of research shows the long-lasting preventative and disease-stopping protection of Priaxor and Merivon,” said Nick Fassler, Technical Market Manager, BASF.

“Research confirms Priaxor and Merivon will be effective tools to protect crops from yield-robbing diseases, helping growers maximize their crop potential.”

Tested in field trials from 2009 through 2011, Priaxor and Merivon are premixes composed of pyraclostrobin – the active ingredient found in Headline® fungicide and Cabrio® EG fungicide – and Xemium® fungicide, a new active ingredient in the carboxamide family.

“The introduction of these products to the marketplace will provide additional tools for growers to maximize their profit potential,” said Paul Rea, Vice President, U.S. Crop Protection, BASF. “We’re committed to providing solutions for growers to solve their greatest challenges and help them get the most out of every acre. These products are major steps in achieving that mutual goal.”

Priaxor results

To evaluate the effectiveness of Priaxor on soybeans, trials were conducted across the country over the past three years. Overall, research showed superior disease control and Plant Health benefits in soybeans. From 2009-2011, soybeans treated with Priaxor showed nearly 17 percent less severity of Septoria brown spot and 13 percent decrease in the severity of frogeye leaf spot and compared to untreated soybean acres.

Recent Priaxor trials show lower levels of disease prevalence and improved Plant Health benefits, resulting in consistent yield increases compared to untreated crops. In more than 60 recent trials, Priaxor yielded higher than the untreated acre 87 percent of the time. In comparison, the current leader in the soybean market, Headline fungicide, outperformed the untreated acre 83 percent of the time.

Priaxor has shown consistent and effective disease control in a variety of other row crops, including corn. Research has shown Priaxor to be effective in controlling several troublesome corn diseases, including gray leaf spot, common rust, and Northern and Southern corn leaf blight. Research confirmed high yield potentials and maximum protection with an early application of Priaxor at V5 followed by Headline AMP fungicide applied at tassel.

Sequential fungicide applications are an effective way for growers to control disease and increase yield potential, especially for those managing for high yield, growing continuous corn or with history of difficult diseases, including anthracnose. A recent trial in Kentucky following this sequential application treatment in corn yielded 34.1 bu/A increase over the untreated check. Although these results are not typical, the trend towards increased yield has proven consistent.

For specialty crop growers, recent studies have shown that Priaxor will be an important tool to help growers control the toughest diseases and produce marketable fruiting vegetables. Priaxor was found to be effective at controlling early blight and black dot in potatoes as well as powdery mildew and black mold in tomatoes. A recent trial in North Dakota found potatoes sprayed with Priaxor had a 1 percent severity of early blight compared to an untreated check with 40 percent severity. Tomatoes treated with Priaxor showed almost a 20 percent less incidence of early blight than untreated plants.

“The research conducted over the last few years indicates Priaxor will be an important tool for growers looking to control difficult fungal diseases,” Fassler said. “The results of effective disease control include healthier plants, higher yield potential and improved crop quality, all of which help a grower’s bottom line.”

Merivon results

Results from research conducted in 2011 demonstrated that Merivon fungicide provides effective control of diseases that annually affect pome and stone tree fruit crops.

Apples treated with Merivon showed no apple scab in 2011 trials, compared to 27.2 percent disease incidence when left untreated. The research also found a 1.5 percent incidence of powdery mildew in apples when treated with Merivon, compared to 86.8 percent disease incidence when left untreated.

Research using Merivon in cherry orchards in 2011 showed excellent control of powdery mildew, leaf spot, Monilinia and Botrytis. Peaches treated the same year with Merivon showed as much as a 50 percent reduction of blossom blight, shot hole and powdery mildew.

“Research shows Merivon fungicide will provide growers with a reliable and effective tool that will help protect pome and stone fruit crops of damaging diseases that rob growers of yield every year,” said Caren Schmidt, Ph.D., Technical Service Representative, BASF.

For more information on BASF Crop protection products, visit

Priaxor, Merivon and Xemium are not registered by the U.S. EPA and are not available for sale. This document is for informational purposes only and is not intended to promote the sale of this product. Any sale of this product after registration is obtained shall be solely based on the EPA-approved product label, and any claims regarding product safety and efficacy shall be addressed solely by the label.