2018 Field Trial Highlights

— Written By NC State Extension

While we conduct 60-70 field trials annually, these are a few of the more interesting ones we thought we would share with everyone. Be sure you pay attention to all the details in each slide and feel free to contact us if you have any questions!

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Spring dead spot severity was extreme with an average patch diameter of 221 in2 in the non-treated controls. All treatments suppressed spring dead spot when compared to the non-treated control on the May 7th rating date.

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Gray leaf spot (GLS) pressure was intense in 2018. All treatments suppressed GLS when compared to the non-treated control. Heritage + QP TM and Fame C provided the best suppression of GLS.

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Brown patch pressure was low relative to previous years in Raleigh, NC. Treatments containing Heritage provided excellent suppression of brown patch when compared to non-treated controls and plots that just received urea. Brown patch severity in plots treated with urea throughout summer months was no different than the non-treated controls.

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Dollar spot was severe in 2018 with disease severity peaking on June 5th. All treatments regardless of spray volumes suppressed dollar spot when compared to the non-treated control. Secure worked best when applied in 0.5 or 1 gallon/1000 ft2 when compared to 2 gallon/1000 ft2. When Secure was applied with a wetting agent efficacy was reduced at 0.5 gallon/1000 ft2. The new product coming from BASF, Maxtima, performed well regardless of spray volume.

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Pythium root rot developed naturally in July. Disease severity was greatest in the non-treated controls on 28 Aug reaching 18%. Only Segway and Union treatments suppressed Pythium root rot curatively when compared to the non-treated control.