The peach fruit fly (PFF), Bactrocera zonata (Saunders) (Diptera: Tephritidae), is one of the most invasive and economically significant pests in Egypt for a variety of fruits in temperate, tropical, and subtropical regions. The efficacy and the latent effect of Eucalyptus citradora (Hook.) extract on the newly formed pupae of B. zonata were assessed. Results indicated that the efficacy of E. citradora extract increased as the applied concentration increased. The highest concentration of the E. citradora extract (2.5%) had a significant effect and caused high mortality among pupae reaching 92% and the LC50 = 2.20. The investigations showed inhibition in the feeding ability, delaying sexual maturity and eggs hatching rate. On
The peach fruit fly (PFF), Bactrocera zonata (Saunders) (Diptera: Tephritidae), is one of the most invasive and economically significant pests in Egypt for a variety of fruits in temperate, tropical, and subtropical regions. The efficacy and the latent effect of Eucalyptus citradora (Hook.) extract on the newly formed pupae of B. zonata were assessed. Results indicated that the efficacy of E. citradora extract increased as the applied concentration increased. The highest concentration of the E. citradora extract (2.5%) had a significant effect and caused high mortality among pupae reaching 92% and the LC₅₀ = 2.20. The investigations showed inhibition in the feeding ability, delaying sexual maturity and eggs hatching rate. On the other hand, the histological sections showed a change in inner tissues such as the basement membrane of the midgut which was destructed. Also, sections in the female reproductive system showed mal-developing oocyte chambers before sexual maturity, shrank oocytes, and degenerated leaving vacuoles after sexual maturity. Also, cross sections in testis showed mild reduction of spermatogenesis series.
the other hand, the histological sections showed a change in inner tissues such as the basement membrane of the midgut which was destructed. Also, sections in the female reproductive system showed mal-developing oocyte chambers before sexual maturity, shrank oocytes, and degenerated leaving vacuoles after sexual maturity. Also, cross sections in testis showed mild reduction of spermatogenesis series.
Key words: Bactrocera zonata, Eucalyptus essential oil, midgut, reproductive system, Biological control