n African Entomology - Effect of host plant on feeding, biological and morphological parameters of Blanchard (Diptera: Agromyzidae)

Volume 22, Issue 3
  • ISSN : 1021-3589



Blanchard (Diptera: Agromyzidae) is a highly polyphagous invasive pest in East Africa. Both adults and larvae cause considerable damage to horticultural crops and the pest is considered of quarantine importance for export to the European market. In an attempt to understand the behaviour of this pest for formulation of suitable management and mass-rearing strategies, a study was conducted to determine the effect of host plant on preference and performance of . Four host plants: L., L., L. (Fabaceae) and M. (Solanaceae) were evaluated for their suitability for feeding, oviposition, development and pupal survival of under no-choice and choice conditions. The conditions simulated monoculture and intercrop systems, respectively. was the most preferred host for feeding and oviposition, with mean feeding punctures of 23.34 ± 3.35 and 11.59 ± 1.36 per cm2 for no-choice and choice conditions, respectively, and mean number of eggs of 0.57 ± 0.11 and 0.08 ± 0.04 per cm2 for the no-choice and choice conditions, respectively. However, was least suitable for development of , with the lowest number of pupae and adults (2.50 ± 0.73 and 1.38 ± 0.46, respectively), pupal survival rate of 6.05 ± 1.95% and fitness as measured by female and male wing length of 1.84 ± 0.04 mm and 1.57 ± 0.03 mm, respectively. This makes it the best candidate trap crop for management of this pest. On the other hand, was the most suitable host plant for development of the pest (42.88 ± 11.80 pupae and 32.13 ± 8.77 adults), pupal survival (65.01 ± 13.86 %) and fitness (2.18 ± 0.03 mm and 1.77 ± 0.04 mm, making it a suitable host for mass rearing of . Previous experience (rearing history) of the pest significantly affected the selection for feeding and oviposition, but did not affect host suitability for development. fed and oviposited significantly more under no-choice condition than choice set-up suggesting the potential of mixed cropping in controlling infestations.

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