Insect succession on wet and dry season rice in Sierra Leone
1974
Taylor, W.E., Njala University College, University of Sierra Leone, Private Mail Bag, Freetown ( Sierra Leone) | Kamara, S.B., Njala University College, University of Sierra Leone, Private Mail Bag, Freetown (Sierra Leone)
A study on the effect of cultivation methods on insect succession and abundance on rice was done during the 1970 wet and 1971 dry seasons. Rice which received fertilizer treatment, generally, attracted a greater number of insects than those which did not receive fertilizer. During the wet season, broadcasting of seeds followed by fertilizer application attracted significantly large numbers of insects. In general, row planting had less insects than either broadcast or random transplanting. The number of insect species during the dry season was significantly greater than those during the wet season. Peak insect population occurred at tillering during the wet season and at flowering during the dry season. Throughout the growth of the plants, there was very little difference between insect population during the morning, mid-day and evening. Abundant species (50 or more) like Epilachna similis, Diopsis thoracica and Aspavia armigera are common to both wet and dry season rice. Other species like Locris maculata, Leptocorisa apicalis, Tettigoniella spectra and Euscirtus bivittatus are mainly wet season pests, whereas Conocephalus ciris, Paranomis gracilis and Riptortus tenuicornis are pests of dry season rice cultivation.
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