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All Journal Jurnal Biologi Tropis
Sianturi, Yosua Pangihutan Pardamean Alextio
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology

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Water Content, Physical Quality of Seeds and Post-Harvest Fungal Attacks on Peanuts Miladiarsi, Miladiarsi; Tsaniyah, Barokati; Putri, Riska Awalia; Saputra, Hiksa Maulana; Sianturi, Yosua Pangihutan Pardamean Alextio
Jurnal Biologi Tropis Vol. 25 No. 3 (2025): Juli-September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v25i3.9754

Abstract

The decline in peanut seed quality can result from improper post-harvest handling, including drying, pod peeling, and storage, which can damage the seeds and reduce their quality. Damaged seeds and high water content facilitate fungal growth on peanuts. Maintaining and ensuring peanut quality during market storage is very important. This study aims to examine the relationship between air content, the percentage of damaged seeds, and the percentage of seeds infected by post-harvest fungal species in peanut seeds. The experimental method involved measuring air content with a DELMHORST Model G-7 Moisture Meter. The physical quality of seeds was assessed based on the percentages of intact, wrinkled, and damaged seeds. To determine the percentage of seeds infected with fungi, the direct planting method was used, employing Dichloran 18% Glycerol Agar (DG18+) media. The results indicated that each sample’s air content was within the normal range of 8-9%, but the physical quality of the seeds was 59.7%, associated with fungal attacks by species including Aspergillus flavus, A. niger, A. tamari, Fusarium semitechtum, Mucor sp., Eurotium repens, and E. chevalieri. These findings suggest that air content and seed damage influence fungal diversity, providing valuable insights for maintaining peanut seed quality during the post-harvest process until they reach the market.
Behavior and Predatory Ability of Several Predatory Insects at Different Prey Densities Batubara, Junianto S.; Nasution, Riska Romaito; Sianturi, Yosua Pangihutan Pardamean Alextio; Pani, Mario; Sayuthi, Muhammad
Jurnal Biologi Tropis Vol. 26 No. 2 (2026): April - Juni
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i2.10757

Abstract

Understanding predator behavior and predation capacity is essential for determining their potential as biological control agents. This study aimed to evaluate the searching time, handling time, and predation ability of three predators Syrphidae larvae, Coccinella sp. larvae, and Curinus coeruleus adults at different prey densities. Five prey-density treatments (5, 10, 15, 20, and 25 individuals) were tested using3 Heteropsylla cubana as prey for C. coeruleus and Rhopalosiphum maidis for Syrphidae and Coccinella sp. The results showed that increasing prey density significantly shortened the searching time of all predators. C. coeruleus demonstrated the fastest searching ability, followed by Syrphidae and Coccinella sp. Handling time also varied among predators, with C. coeruleus requiring the shortest time due to its chewing-type mouthparts, compared with the piercing–sucking mouthparts of Syrphidae and Coccinella sp. Predation capacity differed across predators; only C. coeruleus successfully consumed all prey at every density within 6 hours, while the other predators reached satiation at higher densities. Overall, C. coeruleus exhibited the highest efficiency across all parameters, indicating its strong potential as an effective biological control agent. Increasing prey density consistently enhanced predation activity, highlighting the importance of prey availability in predator effectiveness.
Co-Authors Hiksa Maulana Saputra Junianto S. Batubara Mario Pani Miladiarsi Muhammad Sayuthi Putri, Riska Awalia Riska Romaito Nasution Tsaniyah, Barokati