Differential responses of 15 cowpea genotypes to three Striga hot spots in Niger
| Autor: | Salifou, M., Tignegre, J.B.L.S., Tongoona, P., Offei, S., Ofori, K., Danquah, E. |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
010407 polymers biology Wire mesh Anacardium Randomized block design Field tests Pesticide biology.organism_classification 01 natural sciences 0104 chemical sciences Callosobruchus maculatus Vigna cowpea Striga races differential response hot spots Horticulture Germination 010606 plant biology & botany |
| Zdroj: | International Journal of Biological and Chemical Sciences; Vol 11, No 4 (2017); 1413-1423 |
| ISSN: | 1997-342X 1991-8631 |
| DOI: | 10.4314/ijbcs.v11i4.2 |
| Popis: | In this study, the bioefficacy of the powdery formulations were evaluated. Thus powdery insecticide Antouka®, kaolin powder and powdery formulations based on kaolin powder and various cashew balms were tested against, cowpea bruchid in storage. For each balm, it was formulated 10 g of powdery formulation, which were obtained with 10 g of kaolin and 1 mL of cashew balm. Antouka® insecticide was applied at recommended dose; powdery formulations were tested at 0.5 g; 1 g, for 50 g of cowpea seeds in jars. Twenty (20) cowpea weevils at 24 h old were introduced in each jar. The jars, covered with wire mesh, were kept outdoors during forty five (45) days using a randomized block design with four replicates. Therefore, parameters of mortality and F1 progeny of Callosobruchus maculatus , weight losses, seeds damaged and germination rate were assessed. Results obtained indicated that Antouka® insecticide and the formulated powders caused a significant mortality rate and improved the germination rate of seeds. Nevertheless, the cold extracts had less seeds damaged than hot extracts. F1 progeny decreased with increased dose, (25.50±7.96 insects to 44.50±7.67 insects for 0.5 g; and 11.25±4.62 insects to 29.50±3.22 insects for 1 g). According to calculated LD50 and their confidence intervals, formulated powders have significant toxicity on C. maculatus . These results revealed the bioefficacy of powdery formulations. They can be recommended as alternatives insecticides. Keywords : Callosobruchus maculatus , cowpea, bioinsecticides, toxicity, Benin. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|