Evaluation ofBacillus sp. strains for biological control of gummy stem blight, Didymella bryoniae (Auersw.) in watermelon (Citrullus lanatus) Journals are one of the best online open access journal site in the field of publishing research articles in Agricultural, animal, dairy, food, home, legume Research Journals on a Global platform.

Impact of rice straw biochar and reduced chemical fertilizer on the growth and yield of rice (Oryza sativa L.) in Central Vietnam Journals are one of the best online open access journal site in the field of publishing research articles in Agricultural, animal, dairy, food, home, legume Research Journals on a Global platform.

Background: The cabbage webworm, Hellula undalis (Fabricius) (Lepidoptera: Pyralidae) is destroy insect pest in vegetable crops. Vegetable growers spray many kinds of chemical pesticides to control this insect pest. The objective of this study was to investigate the efficacy of the extract from pongam leaves, Progamia pinnata L. against the cabbage webworm. Methods: The experiment was carried out at the Laboratoty of Entomology, Faculty of Agronomy, University of Agriculture and Forestry, Hue University, Vietnam during 2020 and 2021. Different concentrations of pongam leaf extract was tested its efficacy against first and second instar larvae of the cabbage webworm on potted plants of leaf mustard, Brassica integrifolia West. Result: The efficacy of pongam leaf extract was more efficacious against the first instar than the second instar of H. undalis. At five days after treatment, the efficacy of the pongam leaf extract against first and second instars of H. undalis was 93.2 and 68.4% at concentrations of 1.0%, respectively. Therefore, the pongam leaf extract can be recommended as potential botanical insect ides to control the cabbage webworm.

Background: The gummy stem blight caused by the fungal pathogen Didymella bryoniae (Auersw.) is a common and serious disease of watermelon plants in Vietnam. Bacillus species have been used to control plant diseases as biological control agents. The objectives of this studies were to determine the fungal inhibition of D. bryoniae and disease suppression of gummy stem blight under greenhouse by Bacillus sp. strains. Methods: The study was carried out at University of Agriculture and Forestry, Hue University during 2022-2023. Six potential Bacillus strains namely S1A1, S1F3, S13E2, S13E3, S18F11 and S20D12 isolated from stem-base of groundnut in central Vietnam were tested its fungal inhibition of D. bryoniae and disease suppression of gummy stem blight. Result: All tested strains of Bacillus sp. showed inhibition of the hyphal growth of D. bryoniae strain DB-01 in potato dextrose broth. Among the strains, Bacillus sp. S20F12 had highest inhibition of the growth of mycelia of D. bryoniae strain DB-01 with an antagonistic efficiency of 65.7% at 10 days after fungal inoculation. By 21 days after fungal inoculation, disease incidences were low in the plants treated with Bacillus sp. S20D12 and S1F3 by 46.6 and 50.0% and disease severity by 15,3% and 20.6%, respectively. As results, watermelon plants were prevented from damage of gummy stem blight caused by D. bryoniae strain BD-01 by Bacillus sp. S20D12 and S1F13. The results would contribute to the knowledge of antagonistic activities of the Bacillus to optimize the biological control against D. bryoniae.

Effect of vermicompost application on growth and yield of lettuce (Lactuca sativa L.) under organic cultivation Journals are one of the best online open access journal site in the field of publishing research articles in Agricultural, animal, dairy, food, home, legume Research Journals on a Global platform.

Carbon dots (CDs), discovered in 2004, are an emerging member of the carbon nanomaterial family. With their promising properties, CDs have found numerous applications across a wide range of fields. In recent years, their use in agriculture has attracted increasing attention; however, studies on their effects on plant yield and quality remain limited. To address this gap, a field experiment was conducted during the winter season (September–November 2024) at an organic farm in Huong An commune, Hue City, Vietnam (N16°28′21.81″; E107°31′36.996″). The experiment evaluated the effects of CDs applied at seven concentrations (10, 20, 30, 40, 50 and 60 ppm) on lettuce (Lactuca sativa L.) growth, yield traits, and soil physicochemical properties. The findings demonstrated that CD application had a positive effect on lettuce growth and yield, with the highest yield (23.73 t/ha) observed at 60 ppm. Furthermore, CD application at 60 ppm increased soil organic matter by 0.13% and improved both the physical and chemical properties of the soil, resulting in increases in pH (KCl), total nitrogen, total phosphorus and total potassium by 0.45, 0.055, 0.026 and 0.033%, respectively, compared with the treatment without CD application. These results suggest that the foliar application of carbon dots can provide multiple benefits for lettuce production while simultaneously improving soil quality.