Reference Report for SoyBase12402951
| Title: | First report of soybean rust (Phakopsora pachyrhizi) in Nigeria |
| Authors: | Akinsanmi, O.A., Lapido, J.L., Oyekan, P.O. |
| Source: | Plant Dis. 85(1):97-97 |
| Abstract: | Rust caused by P. pachyrhizi was observed for the first time on soyabean (Glycine max) in Nigeria during the 1999 soyabean main growing season. Rust was not observed in the early season soyabean crop of 1999. Symptoms were first observed as chlorotic spots on the leaves that were closer to the soil, which then progressed to reddish brown lesions and, eventually, uredia. The symptoms developed further up the plant until all leaves were infected. Pimple-like uredia observed in the lesions were more pronounced and numerous on the lower surface of the leaves than the upper. Premature defoliation occurred in infected plants. Seed weight of soyabean cultivars TGX 1485-1D, TGX 1448-2E and TGX 1440-1E was reduced by 28, 52 and 49%, respectively. Disease severity was high in medium maturing cultivars and in all plants that were sown late. This is the first report of soyabean rust caused by P. pachyrhizi in Nigeria. |
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