Integrated Management of Aphis craccivora in Cowpea Using Intercropping and Entomopathogenic Fungi under Field Conditions. uri icon

abstract

  • Cowpea aphid,Aphis craccivora, is a major cowpea pest. Cowpea-cereal intercrop alone does not effectively manage the pest. Use of pesticides in intercrop leads to health and environmental risks. Fungal-based biopesticides offer a better option because they are environment- and consumer-friendly. This study assessed the combined effect ofMetarhizium anisopliaeICIPE 62 and cowpea-maize intercrop againstA. craccivoraunder six treatments: (1) untreated cowpea monocrop, (2) untreated cowpea-maize intercrop, (3) cowpea monocrop + ICIPE 62, (4) cowpea-maize intercrop + ICIPE 62, (5) cowpea monocrop + Duduthrin insecticide, and (6) cowpea-maize intercrop + Duduthrin during three seasons (long rainy/cold and dry/short rainy). In the cold and dry season, cowpea-maize intercrop treated with ICIPE 62 recorded the lowest infestation/cowpea damage, whereas the leaf yield was comparable to cowpea monocrop treated with ICIPE 62. In the short rainy season, the cowpea-maize intercrop treated with ICIPE 62 recorded the lowest infestation/damage, whereas leaf yield was similar to cowpea-maize intercrop treated with ICIPE 62 in the cold and dry season. Duduthrin in monocrop and intercrop did not reduce aphid infestation/cowpea damage levels in all the seasons. Although the efficacy ofM. anisopliaeICIPE 62-based biopesticide could be affected by seasons, it successfully controlled aphid population in cowpea-maize intercrop under field conditions without affecting aphid-associated natural enemies.

publication date

  • 2020
  • 2020