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All Journal JPT : JURNAL PROTEKSI TANAMAN (JOURNAL OF PLANT PROTECTION) Journal of Biodiversity and Biotechnology
MARSADI, DICKY
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Agriculture, Biological Sciences & Forestry Environmental Science

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Struktur Komunitas dan Sebaran Populasi Kutu Putih (Hemiptera: Pseudococcidae) pada Tanaman Ubi Kayu di Bali: Implikasi Pengelolaan Hama Berkelanjutan Astuthi, Made Mika Mega; Marsadi, Dicky; Dirgayana, I Wayan
Jurnal Proteksi Tanaman (Journal of Plant Protection) Vol. 9 No. 2 (2025): December 2025
Publisher : Plant Protection Department, Faculty of Agriculture, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jpt.9.2.83 - 94.2025

Abstract

Mealybugs (Hemiptera: Pseudococcidae) are important pests that threaten cassava in Bali; however, detailed information on their community structure and spatial distribution remains limited. This study aimed to analyze the community structure and spatial distribution patterns of mealybugs infesting cassava across Bali Province, Indonesia. Field sampling was conducted in nine regencies—Jembrana, Tabanan, Buleleng, Badung, Denpasar, Gianyar, Bangli, Klungkung, and Karangasem—using a diagonal sampling method. In each regency, five sampling units were established, with five cassava plants observed per unit. On each plant, three upper, middle, and lower leaves were examined. The results of the study showed four mealybug species: Phenacoccus manihoti, Paracoccus marginatus, Ferrisia virgata, and Pseudococcus jackbeardsleyi, with species richness index values ranging from 0.368 to 0.388. All species were recorded in all surveyed regencies and exhibited a predominantly random spatial distribution pattern, as indicated by a variance-to-mean ratio (S²/X ≈ 1). Overall dominance was highest for P. marginatus (46.23%), particularly in Karangasem, followed by P. manihoti (45.72%) in Denpasar. The mealybug community structure was characterized by a diversity index (H′) ranging from 0.73 to 1.22, an evenness index (E) ranging from 0.16 to 0.24, and a dominance index (C) ranging from 0.32 to 0.54, indicating spatially variable communities that ranged from relatively stable to less stable conditions. These findings provide the baseline data on the community structure and spatial distribution of mealybugs on cassava in Bali, offering important insights for developing targeted monitoring and sustainable pest management strategies
Effects of Rice Varieties on Attractiveness, Population Development, and Weight Loss Caused by Sitophilus oryzae During Storage Marsadi, Dicky; Yuliadhi, Ketut Ayu
Journal of Biodiversity and Biotechnology Vol 5, No 2 (2025)
Publisher : Pusat Penelitian dan Pengembangan Bioteknologi dan Biodiversitas (P3BB) LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jbb.v5i2.113966

Abstract

Sitophilus oryzae is one of the major pests of stored rice, causing both quantitative and qualitative losses during storage. This study aimed to analyze the effects of different rice varieties on attractiveness, population development, and weight loss resulting from S. oryzae infestation. The research was conducted using a free-choice attractiveness test, population development observations, and weight loss measurements on four rice varieties, namely red rice, white rice, black rice, and brown rice. The results indicated that rice variety significantly affected the behavior and population development of S. oryzae. Red rice exhibited the highest level of attractiveness and the greatest population growth rate, followed by black rice and brown rice, whereas white rice showed the lowest attractiveness, population growth rate, and weight loss. The pattern of rice weight loss corresponded to pest population levels, with varieties harboring higher S. oryzae populations experiencing greater percentages of weight loss. Differences in S. oryzae responses among rice varieties are likely associated with variations in the physical and chemical characteristics of the grains, particularly nutrient content and grain layer structure, which influence feeding preference and developmental success of the pest. These findings suggest that rice varieties have potential as an important component of postharvest pest management strategies, especially in reducing storage losses through the selection of varieties that are relatively more resistant to S. oryzae infestation.
Genetic Variability and Trait Correlations of Melon (Cucumis melo L.) Genotypes Anggara, Heru; Marsadi, Dicky; Listihani, Listihani
Journal of Biodiversity and Biotechnology Vol 5, No 2 (2025)
Publisher : Pusat Penelitian dan Pengembangan Bioteknologi dan Biodiversitas (P3BB) LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jbb.v5i2.113228

Abstract

Melon (Cucumis melo L.) is an important horticultural crop. Melon breeding programs require comprehensive information on genetic variability and selection-related traits. Genetic variability and correlations among plant characters are essential parameters for effective selection in the S2 Population. This study aimed to evaluate the genetic variability of several melon genotypes and to analyze correlations among plant characters as a basis for selection. The experiment was conducted using fourteen melon genotypes derived from selfed populations at the S₂ generation. The study employed a randomized complete block design with a single factor, consisting of 14 S₂ melon genotypes and four replications. The experimental unit is one individual plant in a polybag. The Observations of qualitative traits indicated the presence of variation within the genotypes for fruit rind color and fruit flesh color. Genotypes G2 exhibited the greatest fruit length (13.47 cm) and fruit diameter (11.95 cm). Genotypes G15 showed the highest total soluble solids content (150 Brix), while genotypes G7 had the thickest fruit flesh (3.25 cm). Broad-sense heritability estimates of the observed traits ranged from low to moderate. The traits of fruit length, fruit diameter, and fruit weight exhibited moderate broad-sense heritability (>45%). They were positively and significantly correlated with fruit weight, indicating that these traits can be used as selection criteria for fruit weight in subsequent plant breeding programs.
Phenology Dynamics: Flowering and Fruit Development of Prabu Bestari Grape Variety in Denpasar Sari, Ni Ketut Karina; Febriayanti, Dewa Ayu Ari Ari; Putri Murtiyah, Ni Nyoman Ari; Marsadi, Dicky
Journal of Biodiversity and Biotechnology Vol 5, No 2 (2025)
Publisher : Pusat Penelitian dan Pengembangan Bioteknologi dan Biodiversitas (P3BB) LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jbb.v5i2.109980

Abstract

Grape (Vitis vinifera L.) var. Prabu Bestari is an important fruit commodity, but information regarding its reproductive phenology is still minimal. This qualitative descriptive study aimed to determine the time periods required for key phenological stages, namely bud burst, bloom, fruit set, and fruit ripening (harvest), which are crucial for breeding and optimizing production. The research was conducted at the Faculty of Agriculture's Experimental Garden (0–9 masl). The observations revealed a rapid reproductive growth cycle. The average time from pruning to shoot emergence (bud burst) was 7 days after pruning (dap). The phase from bud burst to flowering lasted 18–19 days. Full bloom was very brief, lasting only 1 day, and the phase from flowering to fruit set required 1–3 days. The longest period was from fruit set to harvest, lasting 48 days. Overall, the cycle from pruning to harvest for the Prabu Bestari variety required an average of 120 dap. This phenological data provides an essential basis for effective cultivation management.
Co-Authors Anggara, Heru Febriayanti, Dewa Ayu Ari Ari KETUT AYU YULIADHI Listihani, Listihani Made Mika Mega Astuthi Putri Murtiyah, Ni Nyoman Ari SARI, NI KETUT KARINA