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All Journal Jurnal Agroplasma
Siti Hardianti Wahyuni
University of Graha Nusantara
Agriculture, Biological Sciences & Forestry

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Efektivitas Serangga Penyerbuk Terhadap Pembentukan Buah Pada Tanaman Aren (Arenga pinnata L.) Di Kecamatan Marancar, Kabupaten Tapanuli Selatan Nidia Hotnita Harahap; Siti Hardianti Wahyuni; Surya Handayani
JURNAL AGROPLASMA Vol 13, No 2 (2026): Jurnal Agroplasma Vol.13 No.2 (Oktober 2026)
Publisher : UNIVERSITAS LABUHANBATU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/agroplasma.v13i2.9950

Abstract

The aren palm (Arenga pinnata) is one of the plantation commodities with high economic value in Indonesia, especially in Marancar District, South Tapanuli Regency. This study aims to find out the types of pollinating insects that visit aren flowers, study the activity of these pollinators, and analyze their relationship with fruit formation in Marancar District, South Tapanuli Regency. The research was conducted for about 4 months using an exploratory survey method through direct observation of blooming aren flowers. Observations were carried out in the morning and evening. The recorded data included the number of insects caught, insect identification, the number of seeds formed, and the weight of the fruit bunches. Insect identification was done at the Laboratory of the Faculty of Agriculture, Graha Nusantara University, Padangsidimpuan, using a morphological taxonomic approach. The research results showed that the number of pollinating insects caught was 2,820 individuals, consisting of 1,685 individuals in the morning and 1,135 individuals in the afternoon. The insects found belonged to the order Coleoptera with 5 families, namely Curculionidae, Staphylinidae, Carabidae, Chrysomelidae, and Hydrophilidae. The Staphylinidae family was the most dominant group with a percentage of 44.15%, followed by Carabidae at 32.98%. The total number of seeds formed in all samples reached 21,746 seeds with a total bunch weight of 1,502 kg. The study showed that pollinating insect activity is higher in the morning and is suspected to influence the success of fruit formation in aren plants. 
Pengaruh Ekstrak Daun Pepaya (Carica papayae ) dalam Mengendalikan Hama Ulat Daun (Spodoptera litura) Pada Tanaman Sawi Zhunnun An Nafri; Siti Hardianti Wahyuni; Dini Puspita Yanty
JURNAL AGROPLASMA Vol 13, No 2 (2026): Jurnal Agroplasma Vol.13 No.2 (Oktober 2026)
Publisher : UNIVERSITAS LABUHANBATU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/agroplasma.v13i2.9888

Abstract

Mustard (Brassica juncea L.) is one of the most widely cultivated vegetable crops in Sumatra. Severe infestations by insect pests can cause extensive leaf damage, leading to significant yield losses and even plant death. This study aimed to evaluate the effectiveness of papaya (Carica papaya L.) leaf extract in controlling the armyworm Spodoptera litura on mustard plants. The research was conducted in Ujung Gurap Village, Batunadua District, Padangsidimpuan City, Indonesia, from November 2025 to February 2026. The experiment was arranged in a Randomized Complete Block Design (RCBD) consisting of five treatments with six replications, resulting in 30 experimental units. The treatments were: A0 = without papaya leaf extract (control), A1 = papaya leaf extract at 100 g L⁻¹ water, A2 = papaya leaf extract at 150 g L⁻¹ water, A3 = papaya leaf extract at 200 g L⁻¹ water, and A4 = papaya leaf extract at 250 g L⁻¹ water. The observed parameters included the percentage of plants infested by S. litura, the number of damaged leaves, and fresh yield. The results showed that increasing the concentration of papaya leaf extract significantly reduced both the number of infested plants and the number of damaged leaves caused by S. litura. The highest fresh yield was obtained from the application of papaya leaf extract at a concentration of 250 g L⁻¹ water, with an average production of 6,650 g. Keywords: botanical insecticide, Brassica juncea, Carica papaya, mustard, Spodoptera litura. 
Dampak Vegetasi Tutupan Lahan Terhadap Komunitas Serangga Penyerbuk Pada Tanaman Aren (Arenga pinnata Merr.) di Kecamatan Angkola Barat Anggi Hairani Hasibuan; Dini Puspita Yanty; Siti Hardianti Wahyuni
JURNAL AGROPLASMA Vol 13, No 2 (2026): Jurnal Agroplasma Vol.13 No.2 (Oktober 2026)
Publisher : UNIVERSITAS LABUHANBATU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/agroplasma.v13i2.9949

Abstract

Land cover vegetation plays a critical role in supporting the presence and abundance of pollinator insect communities, which directly influences the pollination success and sap production of sugar palm (Arenga pinnata Merr.). This study aimed to identify the diversity, abundance, and daily activity patterns of pollinator insects associated with sugar palm flowers under varying land cover vegetation in Angkola Barat District, South Tapanuli Regency. An exploratory observational approach with field survey and purposive sampling was conducted on 3 flowering sugar palm trees. Insect visitation activity was observed in the morning (07:00–11:00 WIB) and afternoon (15:00–18:00 WIB) using sweep nets as flower covers, followed by a vegetation inventory in the surrounding area. A total of 1,555 pollinator insects were collected, with higher abundance recorded in the afternoon (818 individuals) than in the morning (737 individuals). All identified insects belonged to the order Coleoptera, comprising 5 families/genera: Staphylinidae (843 individuals; 54.21%), Carabidae (268 individuals; 17.23%), Dermestidae (238 individuals; 15.31%), Cantharidae (178 individuals; 11.45%), and Dryophoridae (28 individuals; 1.80%). The vegetation inventory identified 11 plant species forming canopy stratification (trees, shrubs, and ground cover). The pollinator insect community on sugar palms in the study area was strongly dominated by the Staphylinidae family, exhibiting higher activity in the afternoon. The complexity of the surrounding supporting vegetation contributes to maintaining habitat availability and the stability of the pollination ecosystem.  Keywords: Arenga pinnata, Coleoptera, Land Cover, Pollinator Insects, Relative Abundance
Co-Authors Anggi Hairani Hasibuan Dini Puspita Yanty Dini Puspita Yanty Nidia Hotnita Harahap Surya Handayani Zhunnun An Nafri