The study evaluated the effectiveness of six insecticide products chlorpyrifos 50% + cypermethrin 5%, profenofos 40% + cypermethrin 4%, deltamethrin 2.5%, imidacloprid 20% and malathion 67% along with an untreated control, on the abundance and infestation of Aulacophora foveicollis (Lucas) and epilachna beetle (Epilachna dodecastigma (Wiedemann), E. vigintioctopunctata (Fabricius)), as well as on honeybee (Apis sp.) pollinator abundance and crop yield. The findings showed that the applied insecticides significantly reduced pest abundance and infestation levels, resulting in higher yield of sweet gourd. Among the tested insecticides, chlorpyrifos + cypermethrin resulted in the lowest abundance of red pumpkin beetle (0.50 beetle vine-1) and epilachna beetle (0.22 beetle vine-1), as well as the lowest levels of leaf and flower infestation (17.0 and 8.9%, respectively). Chlorpyrifos + cypermethrin reduced the abundance of red pumpkin beetle and epilachna beetle by 90.6 and 91.1%, respectively, and decreased leaf and flower infestation by 61.6 and 70.9%, respectively. Abundance of honeybee was highest in the untreated control (3.7) followed by malathion (3.3) and cypermethrin (2.8). The highest yield (22.0 tons ha-1) of sweet gourd was recorded in the plots treated with chlorpyrifos + cypermethrin, which produced 158.8% higher yield compared to the untreated control, indicating its superior effectiveness in reducing pest infestation and enhancing crop productivity.
Samia Sultana Sumi, Md. Shamim Hossain, H. Aslam et al.· Pesticide Research Journal· 0 citations
Potato (Solanum tuberosum L.) is an important food and cash crop in Bangladesh; however, production in coastal regions is constrained by poor soil fertility and salinity stress. Vermicompost has emerged as a sustainable soil amendment capable of improving soil health and crop productivity. Therefore, the present study was conducted to evaluate the effects of different rates of supplementary vermicompost under a recommended inorganic fertilizer regime on the growth and yield of the potato cultivar BARI Alu-88 under coastal conditions. The experiment was carried out during the 2021–2022 growing season at the field of Noakhali Science and Technology University using a randomized complete block design (RCBD) with four treatments: T₀ = control (recommended inorganic fertilizer only), T₁ = recommended inorganic fertilizer + vermicompost @ 3.5 t ha⁻¹, T₂ = recommended inorganic fertilizer + vermicompost @ 5.5 t ha⁻¹, and T₃ = recommended inorganic fertilizer + vermicompost @ 7.5 t ha⁻¹, with three replications each. Supplementary vermicompost application significantly (P ≤ .01) improved all growth and yield attributes compared with the recommended inorganic fertilizer alone. The highest vermicompost rate (T₃) produced the tallest plants (56.73 cm), the greatest numbers of leaves (495.03 hill⁻¹), stems (7.60 hill⁻¹), and tubers (21.55 plant⁻¹), and the highest gross tuber yield (40.44 t ha⁻¹) and marketable yield (36.79 t ha⁻¹). Moreover, T₃ reduced the proportion of small-sized tubers (19.32%) while increasing the proportion of large-sized tubers (50.05%). The findings indicate that supplementary vermicompost application under the recommended inorganic fertilizer regime markedly enhanced vegetative growth, tuber development, and yield performance of BARI Alu-88 under coastal conditions. Although vermicompost is recognized as an environmentally friendly soil amendment, its adoption in the coastal saline areas of Bangladesh remains limited. The findings of the present study indicate that applying vermicompost at 7.5 t ha⁻¹ significantly improves the growth and yield of BARI Alu-88 under saline conditions. Therefore, supplementing the recommended inorganic fertilizer with vermicompost at 7.5 t ha⁻¹ can be recommended as an environmentally sustainable nutrient-management strategy for improving potato productivity in the coastal regions of Bangladesh.
Md Billal Hossain, Hania Aslam, M. Ali et al.· Asian Journal of Research in...· 0 citations
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