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• Effects of Combining Soil and Foliar Fertilization on Growth, Developmentand Yield ofEggplant

  Thieu Thi Phong Thu, Tran Thi Thiem, Phung Xe Pa

  Date Received: 06-12-2022 / Date Accepted: 27-03-2023

   Abstract PDF (VIETNAMESE)

  The experiment aimed to determine the suitable types of organic fertilizer for the growth, development and yield of eggplant in Gia Lam, HaNoi.Atwo-factor experiment was laid out in randomized complete block design comprising 8treatments with three replications. The first factor wassoil fertilization withP1 - Chicken manure, P2 - Minori fertilizer, P3 - Inorganic fertilizerandP4 - Vermicompost. The second factor wasfoliar organic fertilization with C1 - O-MIC and C2 - HB101 (plant vitalizer). Research results showed that vermicompost exhibitedthe best effectson the growth and yield of eggplant. Foliar application of HB101 brought better effectson the growth and yield of eggplant compared to application of O-MIC. Combined use of vermicompost and HB101 foliar vitalizer gave the highest eggplant yield of 14.05 tons/ha, 2.89 tons/ha higher than the yield in combination ofinorganic fertilizerandO-MIC and 2.39 tons/ha higher than the yield inthe combination ofinorganic fertilizerand HB101.

• Parasitism of the Parasitoid Encarsia sp.(Hymenoptera: Aphelinidae) on whitefliesBemisia tabaci(Gennadius) (Hemiptera: Aleyrodidae)

  Pham Thi Hieu, Tran Thi Thu Phuong, Pham Hai Chi

  Date Received: 29-08-2023 / Date Accepted: 07-03-2024 / Date Published: 12-06-2025

   Abstract PDF (VIETNAMESE)

  This study aimed to investigate the parasitism rate of Encarsia sp.on B. tabacias well as the impact of host age, host density and parasitoid density on its parasitism. The survey on natural Encarsiaparasitism was conducted on the eggplant fields at Gia Lam, Hanoi at 7 days interval. The results showed that Encarsia sp.had the highest parasitism rate (58.57%) in the middle of June and declined afterward. The parasitoid and whiteflies were mass rearing in the laboratory and recorded for the parasitism rate in 24 hours with different host age (1st-4thinstar nymphs), host densities (5-80 nymphs(3rd-4thinstar)/ leave) and parasitoid densities (1-4 females/ 50 nymphs (3rd-4thinstar). Encarsia sp. reached the highest parasitised percentage at 3rdinstar nymph and lowest at 1stinstar nymph. As the host density increased the parasitism rate decreased, but the emerge rate increased, however. Nevertheless, parasitism increased with increased parasitoid density, but the average parasitism per female decreased. At densities of 1-2 female parasitoids the emerge rate was higher than at 3-4 female parasitoids.Overall, Encarsia sp. had high parasitism rate on the field and host age, host and parasitoid density influenced its parasitism.

  DOI: https://doi.org/10.31817/tckhnnvn.2024.22.3.

• Parasitism of the Parasitoid Encarsia sp.(Hymenoptera: Aphelinidae) on whitefliesBemisia tabaci(Gennadius) (Hemiptera: Aleyrodidae)

  Pham Thi Hieu, Tran Thi Thu Phuong, Pham Hai Chi

  Date Received: 29-08-2023 / Date Accepted: 07-03-2024 / Date Published: 12-06-2025

   Abstract PDF (VIETNAMESE)

  This study aimed to investigate the parasitism rate of Encarsia sp.on B. tabacias well as the impact of host age, host density and parasitoid density on its parasitism. The survey on natural Encarsiaparasitism was conducted on the eggplant fields at Gia Lam, Hanoi at 7 days interval. The results showed that Encarsia sp.had the highest parasitism rate (58.57%) in the middle of June and declined afterward. The parasitoid and whiteflies were mass rearing in the laboratory and recorded for the parasitism rate in 24 hours with different host age (1st-4thinstar nymphs), host densities (5-80 nymphs(3rd-4thinstar)/ leave) and parasitoid densities (1-4 females/ 50 nymphs (3rd-4thinstar). Encarsia sp. reached the highest parasitised percentage at 3rdinstar nymph and lowest at 1stinstar nymph. As the host density increased the parasitism rate decreased, but the emerge rate increased, however. Nevertheless, parasitism increased with increased parasitoid density, but the average parasitism per female decreased. At densities of 1-2 female parasitoids the emerge rate was higher than at 3-4 female parasitoids.Overall, Encarsia sp. had high parasitism rate on the field and host age, host and parasitoid density influenced its parasitism.

  DOI: https://doi.org/10.31817/tckhnnvn.2024.22.3.