Effect of tissue wounding and time of soil inoculation on pepper root rot development |
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Authors: | S EL Alao O Alabi A D Akpa M D Alegbejo P S Marley |
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Institution: | 1. Department of Crop Protection , Institute for Agricultural Research, Ahmadu Bello University , P.M.B. 1044, Zaria , Nigeria alaoemma@gmail.com;3. Department of Crop Protection , Institute for Agricultural Research, Ahmadu Bello University , P.M.B. 1044, Zaria , Nigeria |
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Abstract: | Five-week-old pepper plants with wounds created on stems and roots were transplanted to soils having inoculum of Phytophthora capsici incorporated for different lengths of time. Disease severity (39.99%) on root trimmed seedlings was not significantly different (P ≤ 0.05) from the severity (36.24%) obtained on stem lacerated seedlings. The wound treatments did not result in significantly different rates of lesion extension per day; stem lacerated seedling had the fastest, 1.99 mm/day lesion extension rate, followed by 1.90 and 1.89 mm/day extension rates obtained on root trimmed and unwounded treatments, respectively. However, time of soil inoculation had significant effect on severity; root trimmed and stem lacerated treatments had 46.3% and 39.8% severities, respectively. Tissue wounding × time of soil inoculation interaction did not have significant effect on disease severity; stem lacerated seedlings transplanted to 1-day and 3-day inoculated soils gave highest severity (49.9%), followed by seedlings inoculated at the time of transplantation. Root trimmed seedlings inoculated at the time of transplantation had highest severity (61.1%), while the lowest severity was obtained on seedlings transplanted to 5-day inoculated soil. |
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Keywords: | stem laceration root trimmed disease severity Phytophthora capsici Capsicum annuum |
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