Effect of neem leaf extract applied using the ‘broom’ method, on cowpea pests and yield
| Autor: | H. Bottenberg, B. B. Singh |
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| Rok vydání: | 1996 |
| Předmět: | |
| Zdroj: | International Journal of Pest Management. 42:207-209 |
| ISSN: | 1366-5863 0967-0874 |
| DOI: | 10.1080/09670879609371995 |
| Popis: | We tested aqueous leaf extracts of neem at concentrations of 5 and 10% (w/v) and applied twice and four times during cowpea flowering on two cultivars (IT86D‐715 and IT87D‐941–1) in Kano, Nigeria, in 1993–94 wet season. Extracts were applied with a broom, an indigenous farmers’ practice. Flower infestation by pod borers Maruca testulalis and flower thrips Megalurothrips sjostedti was not reduced by neem application except in 1994 in the 10% neem treatment applied four times. Cv. 715 had consistently less pod damage than cv. 941. On average, neem applications reduced M. testulalis pod damage by 12% in cv. 715 by 16% in cv. 941 compared to the untreated control but not as much as by chemical insecticide (25% and 39% in cv. 715 and 914, respectively). Yield improvement by neem was variable. Significantly greater yield in comparison with the untreated control was obtained only with cv. 715, applied twice at 5% in 1994: 515kg versus 243 kg/ha. Inconsistent yield improvement may have resulted from unev... |
| Databáze: | OpenAIRE |
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