Nematology , 2000, Vol. 2(5), 541-550 Heterodera sacchari : eld population dynamics and damage to upland rice in Côte d’Ivoire Daniel L. C OYNE 1, * and Richard A. P LOWRIGHT 2 1 Natural Resources Institute, Chatham Maritime, Kent ME4 4TB, UK 2 CABI Bioscience, UK Centre, Bakeham Lane, Egham, Surrey TW20 9TY, UK Accepted for publication: 26 May 2000 Summary – In eld studies in Côte d’Ivoire, West Africa, Heterodera sacchari severely reduced upland rice ( Oryza sativa cv. IDSA6) grain yield. In 1995, pre-sowing treatments with carbofuran did not affect crop height, number of tillers at 84 days after sowing (DAS) nor grain yield of O. sativa cv. IDSA6 or O. glaberrima cv. CG14. The protection of eggs within cysts and a delayed hatching pattern are thought to have contributed to this. In 1996 and 1997, cultural methods were used to modify initial population densities and grain yield was correlated negatively with mid-season (56 and 84 DAS) H. sacchari population densities. The relationship between yield ( Y ) and population densities at 56 DAS was described by the equation Y = Y mean . Y mi n + Y mean (1 Y min
Nematology – Brill
Published: Jan 1, 2000
Keywords: WEST AFRICA; YIELD LOSS; O. SATIVA; CYST NEMATODES; PATHOGENICITY; ORYZA GLABERRIMA
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