Effects of Vesicular-arbuscular mycorrhizae, temperature, and phosphorus on Fusarium wilt of sweet potato
1984
Ngeve, J.M. (Institute of Agronomic Research, Yaounde (Cameroon)) | Roncadori, R.W. (University of Georgia, Athens (USA). Dept. of Plant Pathology)
Three sweet potato cultivars were inoculated with Fusarium oxysporum f. sp. batatas (FOB) alone, Vesicular arbuscular mycorrhizae (VAM) fungi alone, or a combination of the two and grown at two temperatures and in soil with different levels of phosphorus. At 32 degrees Celsius, Fusarium wilt prevalence and severity were highest when plants were inoculated with FOB alone but, at 21 degrees Celsius, were highest when plants were inoculated with FOB and VAM jointly. Wilt prevalence and severity increased with increasing P fertilization, and VAM conferred protection to plants at low P fertility. This is the first report of the interaction of VAM fungi, P fertility, and temperature on Fusarium wilt of sweet potato. The role of VAM fungi in protecting plants against wilt and possible explanations for the observed results are discussed.
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