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How Strobilurin Fungicides Can Increase Photosynthesis
Besides disease control, another benefit of strobilurin fungicides involves increased plant greenness and photosynthesis.
“The effect is real,” says Jon Zuk, an agronomist for WinField Solutions. “They can act as a plant growth regulator.”
By boosting plant efficiency, strobilurin fungicides (Quadris, Headline) can help spur increased photosynthesis. That’s reflected in the increased length of time that plants stay green later into the growing season.
In university fungicide trials, though, applications of strobilurin fungicides in the absence of disease have shown mixed results in both large and small plants.
So why the inconsistency?
“Weather,” says Zuk. “In some years, weather is not conducive to it (positive yield responses),” he says. “And each year is different.”
In 2015 WinField trials, for example, V5 applications had generally better responses than applications made at tassel time. “The corn went through an early season that was pretty wet, and had more disease and stress than occurred later on,” he says.