Efficacies of some fungicides and antagonists in controlling northern corn leaf blight disease

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Published: May 15, 2015
Keywords:
Northern Corn Leaf Blight Exserohilum turcicum Fungicides Antagonists Control

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Wathaneeyawech, S.
Plant Biotechnology Program, Graduate School, Plant Biotechnology Research Centre, Chiang Mai University, Chiang Mai 50200, Thailand
Kirdsiri, K.
Plant Biotechnology Program, Graduate School, Plant Biotechnology Research Centre, Chiang Mai University, Chiang Mai 50200, Thailand
Sirithunya, P.
Lampang Agricultural Research and Training Centre, Lampang, Thailand
Smitamana, P.
Plant Biotechnology Research Centre, Chiang Mai University, Chiang Mai 50200, Thailand

Abstract

Three fungicides (chlorothalonil, difenoconazole and mancozeb) at three concentrations: ½ lower than recommended rate, recommended rate and ½ higher than recommended rate, were tested on efficacy to inhibit growth of different Exserohilum turcicum isolates: MHP5, TN3, MJ4, JT4 and JT5, using the poisoned medium method. Results showed that all concentrations of the two contact fungicides, chlorothalonil and mancozeb, gave 100% growth inhibition to all five isolates. Whereas difenoconazole showed 100% growth inhibition in isolates MHP5, TN3 and MJ4 at all three concentrations but gave about 90% in JT4 and about 94-96% in JT5. A field trial on efficacy of the three fungicides at recommended rates was carried out in comparison with two antagonists: Trichoderma harzianum and Serratia plymutica in controlling northern corn leaf blight disease. Hibrix3 sweet corn plants (23 days old) were inoculated with E. turcicum (106 spore/ml) at either 3 d or 7 d after spraying with the fungicides and antagonists. Results revealed that both fungicides and antagonists gave high percentages of disease severity reduction at 10 d after inoculation of 89.58% (difenoconazole), 85.40% (T. harzianum), 79.84% (chlorothalonil), 77.78% (S. plymutica),and 75.69% (mancozeb), when sprayed 3 d before inoculation with the pathogen. The efficacies were increased in the corn plants that were sprayed at 7 d before inoculation, giving severity reductions of 92.35% (chlorothalonil), 91.66% (T. harzianum), 90.55% (S. plymutica), 89.85% (difenoconazole), and 86.11% (mancozeb). Disease control decreased at 20 d after inoculation but was still significant. Though the difenoconazole showed highest reduction percentages while mancozeb came second when applied at 3 or 7 d before pathogen inocul ation, whereas disease reduction by both antagonists ranged from 62% to 70% which are lower than the chemical fungicides, anyhow there was no any statistical difference among the treatments.

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Wathaneeyawech, S., Kirdsiri, K., Sirithunya, P., & Smitamana, P. (2015). Efficacies of some fungicides and antagonists in controlling northern corn leaf blight disease. International Journal of Agricultural Technology, 11(4), 925–936. retrieved from https://li04.tci-thaijo.org/index.php/IJAT/article/view/6385
Issue
Vol. 11 No. 4 (2015): May
Section
Original Study
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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