Jurnal Wana Tropika

Uji In-Vitro Ekstrak Daun Tembakau (Nicotiana tabacum) dan Alamanda (Allamanda cathartica) sebagai Pengendali Hama Helopeltis bradyi pada Bibit Eucalyptus sp.

Andreas Fernandez, Karti Rahayu Kusumaningsih — Mon, 11 May 2026 00:00:00 +0700

Helopeltis bradyi is an important pest in Eucalyptus sp. seedlings that cause damage and seedling death. Pest control that is usually carried out at HTI (Industrial Forest Plantations) is by using chemical pesticides that have the potential to have a negative impact on the environment. Therefore, an alternative pesticide is needed for the use of botanical pesticides. The purpose of this study is to know the effect of botanical pesticide types and solution formulas on the mortality and severity of H. bradyi pest attack on Eucalyptus sp. seedlings. The research used a Randomized Complete Block Design with two treatment factors, namely the type of botanical pesticide (tobacco and allamanda leaf extract) and the solution formula (10%, 20% and 30%). The observed parameters included pest mortality and severity of H. bradyi pest attack on seedlings with in-vitro test. Results of the research showed that interaction between the type of botanical pesticide in the form of Nicotiana tabacum and Allamanda cathartica leaf extract with 30% solution formula produced a higher mortality of H. bradyi pests with 100% pest mortality. Nicotiana tabacum leaf extract with 30% formula produce 0,00% pest attack severity.

Perubahan Tutupan Vegetasi Menggunakan Citra Satelit Landsat 8 dengan Metode NDVI di Kapanewon Cangkringan

Natanael Christian Hutagalung, Sugeng Wahyudiono, Yuslinawari — Fri, 29 May 2026 00:00:00 +0700

Cangkringan Subdistrict is an area in Sleman Regency located on the southern slopes of Mount Merapi. This region experiences significant land use dynamics due to volcanic activity, residential development, and community agricultural activities. These conditions can lead to changes in vegetation cover over time. Changes in vegetation cover require attention because they are related to ecosystem balance, environmental conditions, and regional spatial planning. Accurate information on vegetation conditions is essential for understanding environmental developments in a region. Therefore, remote sensing technology utilizing satellite imagery can be used as a means to effectively and periodically monitor vegetation conditions and changes. This study aims to determine the condition of vegetation cover and changes in vegetation density levels in Kapanewon Cangkringan between 2014 and 2024. The analysis was conducted using the Normalized Difference Vegetation Index (NDVI) method obtained from processing Landsat satellite imagery. The analysis process was carried out with the help of a Geographic Information System through the stages of calculating NDVI values, classifying vegetation density, and overlay analysis to see changes in vegetation cover between observation periods. The results of the study indicate that there was a change in vegetation cover during the 2014–2024 period. The area of “non-vegetated land” decreased from 280.44 ha to 117.99 ha. “Low vegetation” also decreased from 3,291.48 ha to 2,837.25 ha, while “medium vegetation” increased from 903.60 ha to 1,500.30 ha. “Very low vegetation” increased from 384.93 ha to 404.91 ha.Over a period of 10 years in Kapanewon Cangkringan, there has been a decrease in "non-vegetated land" covering an area of 280.44 ha - 117.99 ha = 162.45 ha and "low vegetation" covering an area of 3,291.48 ha - 2,837.25 ha = 454.23 ha, which has increased is "medium vegetation" covering an area of 1,500.3 ha - 903.6 ha = 596.7 ha, and "very low vegetation" increased by an area of 404.91 ha - 384.93 ha = 19.96 ha. There is a dynamic change in land cover, both a decrease and an increase of 616.68 ha. If the area of Kapanewon Cangkringan is 4,860.45 ha, then over 10 years there has been a dynamic change of 616.68 ha or 12.68%.

Pengaruh Bonita dan Ketinggian Tempat Tumbuh terhadap Produktivitas Getah Pinus (Pinus merkusii) DI BKPH Purworejo, KPH Kedu Selatan

Erika Novita Andriani, Siman Suwadji — Mon, 18 May 2026 00:00:00 +0700

The Pine tree (Pinus merkusii Jungh. Et de Vriese) is one of the pioneer plant species that can grow in various conditions without requiring specific growing conditions, and the main product of this tree is Pine resin. This study aims to determine the effect of diameter at breast height (DBH) and altitude on Pine resin productivity, conducted at RPH Bruno plots 46 K-2 and 47B; RPH Katerban plots 103A and 105, BKPH Purworejo, KPH Kedu Selatan. Observations were carried out for 30 days with 3 data collection sessions on tapping wounds made by the researcher. The methods used were Quantitative and Qualitative with multiple linear regression analysis, with the multiple linear regression equation Y = 16.823 – 2.694 X1 – 0.006 X2; based on the regression equation, the value for DBH is -2.694 and for altitude is -0.006. The results of this study show that Bonita and The altitude of the growing location affect Pine resin productivity. In addition, the analysis data of the correlation coefficient (R) in the coefficient of determination (R2) obtained a value of 1, meaning that the variables Bonita and the altitude of the growing location are strongly correlated with pine resin productivity. The estimated annual production results (year 2025) obtained by the researcher are lower compared to the RTT 2025 production target of BKPH Purworejo in the same plot. This result is due to the researcher only weighing resin from one tap made by the researcher, whereas in reality, tapping farmers make an average of two taps.

Pengaruh Jenis Kayu dalam Perendaman Minyak Jelantah dan Plastik LDPE terhadap Stabilisasi Dimensi dan Sifat Mekanik Kayu

Wisnu Wardana, Hastanto Bowo Woesono, Didik Surya Hadi — Tue, 19 May 2026 00:00:00 +0700

This study aims to determine the effect of wood type and immersion time in plastic solution on the dimensional stability and mechanical properties of wood. This study used a completely randomized design with factorial experiments. The factors used consisted of 2 factors including wood type consisting of three types of wood: sengon, teak, bangkirai, and immersion time factors including three levels, namely: control (0), 20, and 30 minutes, each of which was repeated three times. The parameters observed included the dimensional change ratio (T/R), MOE, MOR, and compressive strength parallel to the grain. The test results for each parameter were analyzed using Analysis of Variance, and if there were significant differences, further testing was carried out using the Tukey test. The results showed that immersion increased the dimensional stability of wood as indicated by a decrease in the T/R ratio in sengon from 1.56 to 1.49 and teak from 1.64 to 1.58, while bangkirai had a higher value of 2.03–2.26. Tukey's test showed that the MOE values differed significantly between wood species, namely sengon 1,239.17 kg/cm², teak 2,715.29 kg/cm², and bangkirai 4,669.53 kg/cm². The MOR values were 571.34 kg/cm², 1,394.91 kg/cm², and 2,182.14 kg/cm², respectively. However, the immersion and the interaction between the two did not differ significantly. The compressive strength parallel to the grain also differed significantly between wood species: sengon (255.34 kg/cm²), teak (435.25 kg/cm²), and bangkirai (752.66 kg/cm²). The immersion treatments differed significantly from the control, but no significant differences were observed between the immersion treatments. The average compressive strength parallel to the wood grain increased with each immersion treatment, from 406.56 kg/cm² (0 min) to 514.07 kg/cm² (20 min) and 522.62 kg/cm² (30 min), without any interaction between the two factors.