Efficacy of fungicides for control of head smut (Sporisorium destruens) in broomcorn millet

doi:10.11686/cyxb2015514

Abstract

Abstract: Six fungicides potentially useful for control head smut in broomcorn millet (Panicum miliaceum) were assessed for toxicity and field efficacy against Sporisorium destruens by assessing teliospore germination on agar medium in a laboratory and the growth of broomcorn millet in the field over two seasons. The results of laboratory toxicity tests showed that tebuconazole exhibited the greatest inhibition of S. destruens, with the EC₅₀ (median effective concentration) value of 0.1127 μg/mL, followed by diniconazole, difenoconazole, thiophanate-methyl and carbendazim with the EC₅₀ values of 1.0634, 6.1775, 12.4969 and 54.4021 μg/mL, respectively. Thiram showed the lowest toxicity with the EC₅₀ value of 1169.6448 μg/mL. Compared with the control (no fungicide), fungicide treatments significantly decreased the germination rate and vigor of broomcorn millet seeds. Diniconazole reduced germination and vigor the most. The results of field efficacy trials were similar; tebuconazole had the best control efficacy, followed by diniconazole, thiophanate-methyl and carbendazim. The control efficacy of difenoconazole was good only at high concentration. Thiram had the poorest control efficacy. Carbendazim significantly reduced the area of the second and the third leaf, dry weight of leaves and the number of tillers. Compared with the control, all fungicide treatments reduced grain weight but increased the grain yield. Broomcorn millet yields following tebuconazole application were the highest in both years, while thiram didn’t significantly increase yield in 2014. In summary, tebuconazole produced the best control efficacy at the lowest application rate and could be used for broomcorn millet production.

LIU Jia-Jia, ZHOU Yu, ZHANG Pan-Pan, CHAO Gui-Mei, ZHU Ming-Qi, FENG Bai-Li. Efficacy of fungicides for control of head smut (Sporisorium destruens) in broomcorn millet[J]. Acta Prataculturae Sinica, 2016, 25(9): 132-141.

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