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Early and Late Leaf Spots of Groundnut

RA 00080.pdf1.51 MB
McDonald, D. ;Subrahamanyam, P. ; Gibbons, R.W. ; and Smith, D.H.
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International Crops Research Institute for the Semi-Arid Tropics ; Patancheru 502324, Andhra Pradesh, India
Report/Series/Bulletin Name: 
Early and late leaf spots of groundnut / McDonald, D.
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Leaf spots are the most serious diseases of groundnut (Arachis hypogaea L.) on a wor ldwide scale. The two fungi commonly involved are Cercospora arachidicola Hor i , causing early leaf spot, and Phaeoisariopsis personata (Berk. & Curt.) v. Ar x 1 causing late leaf spot. The diseases have also been referred to as mycosphaerella leaf spots, cercospora leaf spots, brown leaf spots, peanut cercosporiosis, viruela, and t ikka. Leaf spots damage the plant by reducing the  available photosynthetic area, by lesion format ion, and by stimulating leaflet abscission. Worldwide, yield losses range from 10% to over 50%, but vary considerably from place to place  and between seasons. Yield losses are generally substantial when the crop is attacked by both leaf spots and rust (Puccinia arachidis Speg.). Figure 1 shows severe damage to groundnut crops caused by early leaf spot in the USA and Malawi , and by the combined attack of late leaf spot and rust in India.
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