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EVALUATION OF TRIAZOLE AND STROBILURIN FUNGICIDES, ALONE AND IN COMBINATION, FOR CONTROL OF EXSEROHILUM TURCICUM ON SWEET CORN

Applied Research

Christian Miller
Agent II. Commercial Vegetable& Fruit
UF/IFAS
West Palm Beach

Abstract

Abstract


Northern corn leaf blight, caused by Exserohilum turcicum, is often a yield limiting foliar disease of sweet corn (Zea mays) when left unmanaged.  Two field experiments conducted in south Florida during Spring 2008 included fungicides frequently relied upon for control of the pathogen. The trials were designed to evaluate the efficacy of several triazole and strobilurin fungicides, alone and in pre-mixtures.  Four replications of ten fungicide treatments were arranged in randomized complete blocks.  Experimental units were composed of two rows, nine meters in length, separated by three non-sprayed guard rows.  Fungicides were applied using a CO2 backpack sprayer equipped with a 3-nozzle handheld boom.  Maneb, a broad spectrum protectant, was also investigated, as were the strobilurin compounds azoxystrobin, pyraclostrobin, and trifloxystrobin, as well as the triazole compounds metconazole, propiconazole, prothioconazole, and tebuconazole, either alone or in combination.  Disease was severe in both experiments and both trials were considered definitive.  All treatments provided significant disease control though results reveal triazole and strobilurin fungicides perform significantly better than maneb.  Fungicides containing a triazole, either alone or in combination were more efficacious than fungicides containing only a strobilurin compound.  These results demonstrate the benefits of including triazole chemistries in a sweet corn foliar disease management program, especially if northern corn leaf blight is the featured disease.  Triazole/strobilurin pre-mixtures, or rotations of triazoles with strobilurin fungicides, demonstrate the best strategy for managing the sweet corn disease complex which includes foliar blights and rust, since strobilurins perform well on rust.

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Poster has NOT been presented at any previous NACAA AM/PIC

This poster is being submitted for judging. It will be displayed at the AM/PIC if not selected as a State winner. The abstract will be published in the proceedings.

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Authors: C. Miller, McAvoy Eugene, R. N. Raid
  1. Miller, C. Agent II. Commercial Vegetable& Fruit, UF/IFAS, Florida, 33415
  2. Eugene, M. Agent IV. Regional Vegetable/Horticulture, UF/IFAS, Florida, 33935
  3. Raid, R. Professor, Plant Pathology, UF/IFAS, Florida, 33430