Arthropod populations and rice yields in direct-seeded and transplanted lowland rice in West Africa |
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| Authors: | IO Oyediran EA Heinrichs |
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| Institution: | 1. Mulberry Pathology Laboratory , Central Sericultural Research &2. Training Institute , Berhampore, 742 101, West Bengal, India |
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| Abstract: | Studies were conducted on the effect of pruning time, host age, urediniospore release and weather parameters on the incidence and intensity of mulberry leaf rust (Peridiopsora mori). Rust severity significantly increased with increasing shoot age, irrespective of pruning time. Maximum disease severity was observed in plants pruned during the third week of October, and minimum severity in plants pruned during last week of November. Apparent infection rate was higher in younger shoots. Infection rate was higher in plants pruned during the last week of November. Urediniospore release was influenced by prevailing climatic conditions. A higher rate of spore release was noticed during sunny days. Maximum spore release was found between 12.00 h and 14.00 h. Spore release was positively correlated with temperature and negatively correlated with relative humidity. Rust severity (34.97%) was higher in January and least (1.03%) during May. Rust severity was negatively correlated with both temperature and rainfall. An exponential model was developed for the prediction of rust severity which was accurate up to 96.60%. |
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| Keywords: | Cote D'IVOIRE West Africa Oryza Sativa L Rice Insect Pests Planting Method Leafhoppers Spiders Stem Borers Dragonflies Damselflies |
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