Groundnut haulm quality as affected by cercospora leaf spot severity
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Department of Crop Protection, Faculty of Agriculture University of Maiduguri, P. M. B. 1069, Maiduguri, Nigeria
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Bulus Shapshi Bdliya
Department of Crop Protection, Faculty of Agriculture University of Maiduguri, P. M. B. 1069, Maiduguri, Nigeria
Journal of Plant Protection Research 2007;47(3):231-241
The effect of cercospora leaf spot caused by Cercospora arachidicola i Phaeoisariopsis personata on quality of groundnut haulm was assessed using official methods of analysis. The respective field experiments were conducted in 2004 and 2005 cropping seasons, while the laboratory analyses were carried out at the end of the seasons. The scale of 1–9 was used to determine severity of infection on randomly selected groundnut plants. The results showed that the year effect was not significant as related to haulm composition. However, severity of the disease was found to affect haulm composition either negatively or positively. Crude fibre, crude protein, fat and dry matter content of haulm were significantly lower in severely infected haulm samples compared to uninfected or less severely infected samples. While ash, moisture content and nitrogen free extracts (NFE) increased with increasing disease severity. The regression analysis showed that crude fibre, crude protein, fat and dry matter content were negatively related to cercospora leaf spot severity, while ash, moisture content and nitrogen free extracts showed positive relationship with increasing disease severity. Since infection by cercospora leaf spot pathogen lowers the quality of groundnut haulm, controlling the disease is necessary to ensure good quality of haulm at the end of the season.
The authors have declared that no conflict of interests exist.
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