Management of late leaf spot of peanut with Benomyl and chlorothalonil: A study in preserving fungicide utility

被引:23
作者
Culbreath, AK [1 ]
Stevenson, KL
Brenneman, TB
机构
[1] Univ Georgia, Coastal Plain Expt Stn, Dept Plant Pathol, Tifton, GA 31793 USA
[2] Univ Georgia, Dept Plant Pathol, Athens, GA 30602 USA
关键词
fungicide insensitivity; groundnut;
D O I
10.1094/PDIS.2002.86.4.349
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Recent registration of sterol biosynthesis inhibitor and strobilurin fungicides for control of early (Cercospora arachidicola) and late (Cercosporidium personatum) leaf spot diseases of peanut (Arachis hypogaea) has renewed interest in the potential for loss of disease control due to fungicide resistance. The objectives of this study were to use the systemic fungicide benomyl, the protectant fungicide chlorothalonil, and late leaf spot of peanut as a model system to compare fungicide application strategies for fungicide resistance management. Field experiments were conducted at Tifton and Plains, GA, in 1995 and 1996 to determine the effects of alternate applications, mixtures, and alternating block applications of chlorothalonil and benomyl compared with full-season applications of two rates of chlorothalonil and two rates of benomyl alone on late leaf spot of peanut and on the proportion of the pathogen population resistant to benomyl following the various regimes. Tank mix combinations of half rates of the two fungicides and alternations of the full rates of the two fungicides provided better (P less than or equal to 0.05) control of late leaf spot than full-season applications of either rate of benomyl alone, and were comparable to full rates of chlorothalonil alone. Neither tank mixes nor alternating sprays prevented an increase in the relative frequency of benomyl-resistant isolates compared with other treatments in which benomyl was used. Both mixtures and alternate applications of chlorothalonil and benomyl were effective for management of leaf spot in fields where benomyl alone did not provide season-long leaf spot control.
引用
收藏
页码:349 / 355
页数:7
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