Australia

Early leaf spot of peanut

Cercospora arachidicola

Early leaf spot typically causes brown lesions (spots) on leaves. The spots usually are surrounded by a yellow halo, but sometimes halos are not present. The brown lesion color is most distinct on the lower leaf surface. The fungus produces tufts of silvery, hair-like spores on lesions during humid weather. These spores can be seen on the upper lesion surface with the help of a good magnifying glass.
Although early leaf spot can be found as early as 30 days after planting, it usually is not observed in well-rotated fields until mid-July or later. Spots are first seen on lower leaves. As the disease progresses, the number of spots increases. Plants begin to defoliate, starting with the lower leaves and progressing to the upper canopy. In severe epidemics, plants are completely defoliated. The bare stems may also have lesions. 

Pesticides
Alto 100 SL
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Arysta LifeScience Tebcon 430 SC
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Conan 500
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Conan 720 SC
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Custodia 320 SC
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Detour 250 EC
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FMC Chlorothalonil 720
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FMC Chlorothalonil Bond 720
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FMC Propiconazole 250
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FMC Propiconazole 550
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Folicur 430 SC
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Frenta 750 WG
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Launch
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Manzate DF
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Orius 430 SC
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Penncozeb
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Propeller 250
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Veritas
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Arysta LifeScience Procon 250 EC
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Barrack 720
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Brumby 480 SC
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Chlornil 720 SC
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Chloronil Pro
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Chlorothalonil
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Clash Dry 900 WG
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Laguna 430
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Stingray 430
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Tyrant 500
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Zolo 430 SC
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