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Four things to know about fungicides

Thinking about applying
fungicides to your corn and soybeans this summer? Here are four things to know
about fungicides for 2012.


You have a new fungicide to use in 2012.

Last week, federal regulators approved the Xemium stable of
fungicides from BASF. One of those fungicides, Priaxor, is labeled for
soybeans. BASF officials say Priaxor effectively controls soybean diseases that
include anthracnose, Cercospora blight, Septoria brown spot, and soybean rust.

is also labeled on corn, but Headline AMP remains the BASF lead corn product,
say BASF officials. Another fungicide, Merivon, is designed to target disease
in stone fruit crops like apples and peaches.

Xemium stable of products includes a carboxamide mode of action that is new to
row crops. Besides a carboxamide action mode, Xemium fungicides contain F500,
the active ingredient in Headline fungicide. Limited quantities of the
fungicide will be available in 2012, with a full-scale launch slated for 2013.

2. Fungicides won’t replace
critical inputs.
Fungicides curb diseases and can spur physiological benefits in crops.
Still, fungicides won’t make up for major agronomic shortcomings.

won’t help if you have any bottleneck like limited fertility that withholds
overall yield potential,” says Nick Fassler, BASF technical market manager for

3. Manage fungicides to
forestall resistance.
Strains of frogeye leafspot that resist strobilurin fungicides were
documented in Tennessee, Illinois, Kentucky, and Missouri in 2010 and 2011.

step to forestall development of resistant strains of frogeye leafspot is to
plant soybean varieties that resist it. “Fortunately, there are good genetics
that are resistant to it,” says Fassler.

different modes of action when fungicide applications are made can also
forestall resistance, says Fassler.

far, frogeye leaf spot is most prevalent in southern soybean growing regions like
the Mississippi River Delta. However, it is important to watch for expansion in
more northern soybean growing regions.

4. No news is good news for
soybean rust.

When soybean rust first surfaced in November 2004, tremors were felt across
U.S. soybean growing areas. So far, though, this scourge of South American
soybean production hasn’t threatened as many U.S. soybeans as initially
thought. One break U.S. producers caught is that frost kills the fungi that
cause soybean rust. When freeze kills it, soybean rust has to start all over
again the next year by spores migrating northward.

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