Submitted by sandhyagir on Fri, 23/10/2009 - 11:49
Posted in
| Attachment | Size |
|---|---|
| RA 00080.pdf | 1.51 MB |
| 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. |  |
- Login to post comments
- 4352 reads