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All Journal Partner JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA
Jemrifs H. H. Sonbai, Jemrifs H. H.
Politeknik Pertanian Negeri Kupang
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science Immunology & microbiology Social Sciences Veterinary

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Pertumbuhan dan Hasil Jagung Pada Berbagai Pemberian Pupuk Nitrogen di Lahan Kering Regosol Jemrifs H. H. Sonbai
Partner Vol 20, No 2 (2013): Edisi November
Publisher : Politeknik Pertanian Negeri Kupang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35726/jp.v20i2.20

Abstract

The Growth and Harvest of Corn at Variousof Providing Nitrogen Fertilizer on Regosol Dry Lands. Nitrogen is a macro-nutrient that is the primary determinant in corn crop production that is cultivated on dry land. Corn production can be increased by providing inorganic and organic fertilizer. The purpose of the research is to discover the influence of carbamide (urea fertilizer) and cow manure fertilizer levels on the growth of corn production on regosol dry land. The research was conducted from March-June, 2012, at the Gadjah Mada University (UGM) Agriculture Faculty Tridarma Garden, in Banguntapan. The experimental design uses a Complete Group Random Design (RAKL) which consists of two factors. The first factor provides three different amounts of carbamide (100 kg/ha, 150 kg/ha, and 200 kg/ha). The second factor has three different amounts of cow manure fertilizer (10 t/ha, 15 t/ha, and 20 t/ha). The research findings show that the plant height, leaf width, total plant net weight, blossom period, harvest period, seed weight, chlorophyll level, and N-leaf level are influenced by the amount of carbamide, while the amount of cow manure fertilizer can repair the physiological and chemical nature of the soil. There is no relationship between carbamide and cow manure fertilizer levels on corn growth and productivity levels. The use of carbamide has a significant influence on corn growth and productivity on regosol dry land. The average corn productivity on regosol dry land with 200 kg/ha of carbamide is 7.38 t/ha, while lamuru corn has a harvest potential of 7.6 t/ha.Key words:     Nitrogen, Cow Manure Fertilizer, Regosol Dry Land, Corn, Physiological, Growth, Harvest.
TUMBUHAN INANG DAN DAYA MAKAN KEONG MAS (Pomacea canaliculata) PADA BEBERAPA VARIETAS PADI DI KABUPATEN MALAKA Jacqualine Arriani Bunga; Nina Jeni Lapinangga; Jemrifs H. H. Sonbai
Partner Vol 23, No 2 (2018): Edisi November
Publisher : Politeknik Pertanian Negeri Kupang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35726/jp.v23i2.324

Abstract

This study is entitled "Host Plants and Eating Ability of Keong Mas (Pomaceacanaliculata) in some Paddy Varieties in Malaka District". Keong Mas are type of snails which are considered as invasive pests. In Malaka, in 2010-2012 there was a snail boom which caused severe damage to rice to “puso”. This study had been conducted from June 2018 to November 2018. The research aims to study the host plants and the ability to eat of the snails in several rice varieties. The snails were tested for its ability to feed on water plants which were considered as alternative hosts of paddyplants. Host testing was undertaken through forced testing and selective testing of several aquatic plants in rice fields. The eating ability test was carried out on four weeks old paddy varieties cultivated by farmers in Malaka. Fifty rice seedlings were planted in a circle, ten seedlings perplanting hole and were repeated for four times. The number of seeds which were encroached by the juvenile snails was tabulated and analyzed. The result shows that 6 succulent plants were favored by the snails, namely Limnocharis flava, Colocasia esculenta, Ludwigiaadscendens, Monochoriavaginalis, Ipomoea aquatica and Cat tile / Sasoser (Typha spp). The most vulnerable paddy seeds to snails are Ciherang (a), Mapan, Impari 12 (ab), Mokongga (bc), IR 68, Sibogo, and Red Rice (cd), and the most resistant to snails' is Black Rice variety (d).
Kaplan-meier-based survival analysis of Cylas formicarius following exposure to stored Metarhizium anisopliae formulations Lapinangga, Nina; Bunga, Jacqualine Arriani; Sonbai, Jemrifs Herkanus Hati; da-Lopez, Yosefus Frederikus
Jurnal Hama dan Penyakit Tumbuhan Tropika Vol. 26 No. 1 (2026): MARCH, JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA: JOURNAL OF TROPICAL PLANT PE
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jhptt.126190-199

Abstract

The sweet potato weevil (Cylas formicarius) is a major pest of sweet potato crops, particularly in tropical regions. The entomopathogenic fungus Metarhizium anisopliae is a promising biological control agent; however, its application is often constrained by reduced viability during storage. This study evaluated the efficacy of a dry powder formulation of M. anisopliae stored under ambient tropical conditions for 1 to 6 months. Bioassays assessed conidial density, adult mortality, lethal time to kill 50% of the population (LT₅₀), and survival probability using Kaplan–Meier analysis. Formulations stored for up to 3 months maintained high efficacy, with mortality rates exceeding 82.9%, conidial densities above 2.5 × 10⁸ conidia/g, and LT₅₀ values below 120 hours. In contrast, storage beyond three months significantly reduced conidial viability, increased LT₅₀, and decreased mortality. Kaplan–Meier survival curves showed a clear decline in virulence with increasing storage duration, with the 6-month formulation exhibiting the slowest mortality progression. Significant differences in survival probabilities among storage durations were confirmed statistically (p < 0.05). Morphological observations confirmed fungal-induced mortality, characterized by cuticle darkening, tissue softening, mummification, and external sporulation. Conidial deterioration over time was likely associated with physiological factors such as oxidative stress, lipid peroxidation, and depletion of protective compounds including trehalose and mannitol. Overall, storage duration critically affected the bioefficacy of M. anisopliae. It is therefore recommended that dry formulations be used within three months of production to ensure optimal pest control. These findings provide practical guidance for improving fungal biopesticide shelf life in tropical integrated pest management programs.
Co-Authors da-Lopez, Yosefus Frederikus Jacqualine Arriani Bunga Lapinangga, Nina Lapinangga, Nina Jeni