https://dzarc.com/entomology <p><strong>Journal of Applied Entomologist </strong>is an open-access, refereed, peer-reviewed research journal that invites the submission of research articles with significant impact on science and the academic community. The journal focuses on critical and innovative research in entomology and provides a fully open-access platform for scholars and researchers to share their findings with practitioners worldwide.</p> Dzarc Publications en-US Journal of Applied Entomologist 2583-1917 https://dzarc.com/entomology/article/view/805 <p>The current investigation was conducted to study the response of six cotton varieties Giza 45, Giza 87, Giza 92, Giza 94, Giza 96 and Giza 97 to infestation of the <em>Pectinophora gossypiella </em>(Saunders)<em>,</em> <em>Earias insulana</em> and<em> Bemisia tabaci</em>, the genomic DNA extraction and purification were studied under field conditions at the experimental farm of Sakha Agricultural Research Station, Kafr El-Sheikh Governorate, through 2024 and 2025. Therefore, results showed that, Giza 94 variety was the most susceptibility to infested by <em>P. gossypiella</em>, <em>E. insulana</em> and <em>B. tabaci</em>, while Giza 97 variety was the opposite any the most resistant fo<em>r </em>the same pests and recorded the number during the two seasons. While, the other varieties of infections are mean. Results showed that the significant differences between Giza 94 and each of the other cotton varieties. Present study can be helpful in selecting resistant varieties in the development of IPM strategies against bollworms and whitefly for good quality production of cotton. Also, this study used ten SCoT primers to generate 130 DNA bands, averaging 13 per primer, with 37 polymorphic bands (41.16% polymorphism). Primers SCoT-1 and SCoT-9 produced the most bands, while SCoT-4 showed the lowest polymorphism, highlighting useful variations for cotton DNA identification.</p> Abd El-Salam A Farag Lina H. E. Saad Hassan A. Mesbah Copyright (c) 2026 https://creativecommons.org/licenses/by/4.0/ 2026-01-05 2026-01-05 6 1 01 08 10.64171/JAE.6.1.01-08 https://dzarc.com/entomology/article/view/811 <p>This study aimed to analyze the diversity, dominance, evenness, and environmental factors of insects in two different habitat conditions, namely cocoa plantations with insecticide application and without insecticide application in Siantar Marimbun District, Pematangsiantar City. Samples were collected using purposive sampling with yellow sticky traps. A total of 3,649 individuals representing 24 insect species from four orders (Coleoptera, Hemiptera, Hymenoptera, and Diptera) were successfully identified. Hymenoptera was the most abundant order, with <em>Messor barbarus</em> as the dominant species. The Shannon-Wiener diversity index was higher in non-insecticide-treated fields (H1′ = 2.41) compared to insecticide-treated fields (H2′ = 2.28). The dominance index was relatively greater in insecticide-treated fields, while the evenness values in both habitats were categorized as high. The t-test indicated a significant difference in insect diversity between the two habitats (t-value = 3.71 &gt; t-table = 1.96). The measurement results for environmental factors indicate that the temperature ranges from 27.8 to 29.5 °C, the humidity ranges from 69% to 79%, and the wind speed ranges from 1.0 m/s to 1.6 m/s.</p> Jeremia Saragih B. Manurung Copyright (c) 2026 https://creativecommons.org/licenses/by/4.0/ 2026-01-13 2026-01-13 6 1 09 14 10.64171/JAE.6.1.9-14