Triazole, Strobilurin Fungicides & Surfactants

Pecan 004We are little behind in nut development, but are likely to move in the period of rapid nut sizing stage in the next few weeks. With our scab fungicide programs ongoing, UGA Extension Pathologist, Dr. Tim Brenneman’s fungicide results reveal that adding a surfactant to the DMI/Strobilurin mix fungicide products like Absolute significantly reduce the incidence and severity of leaf scab over the fungicide alone.

UGA Extension Pecan Horticulturalist, Dr. Lenny Wells, says similar results are expected with the effect on nut scab. Dr. Brenneman used a 90/10 surfactant but expects the same results could be obtained with an 80/20 surfactant. Also, similar results would be expected with the other DMI/Strobi mix fungicides like Quadris Top and Quilt. The inclusion of a surfactant with DMI’s like Enable, Tebuconazole, Orbit, Propimax or Bumper mixed with Tin would likely be of benefit as well.

Be sure to jar test for compatibility when using any new tank mix. With the at least temporary shortage of Elast, this provides us with another good tool to fight scab. DO NOT ADD A SURFACTANT WHEN USING ELAST due to the increased risk for burn.

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