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Anggraeni, Flavia Devi
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Waktu kritis periode lunar dalam menggambarkan status reproduksi ngengat Scirpophaga incertulas (Walker) pada berbagai fase pertumbuhan padi: Critical timing of the lunar period in describing the reproductive status of the Scirpophaga incertulas moth (Walker) on several growth stage of rice Anggraeni, Flavia Devi; Anwar, Ruly; Ratna, Endang Sri
Jurnal Entomologi Indonesia Vol 22 No 1 (2025): March
Publisher : Perhimpunan Entomologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5994/jei.22.1.29

Abstract

The yellow stem borer, Scirpophaga incertulas (Walker) is a major nocturnal pest of rice. Presence of S. incertulas moth had a flight peak during the lunar period and affects its reproductive status. The purpose of this study was to analyze the critical time in the lunar period related to the highest reproductive status of S. incertulas in the field. Monitoring of moth populations were carried out by setting up two traps equipped with 60-watt LED lights (800 lm) on farmers’s fields in Rawamerta District, Karawang Regency, West Java. Moth trapping was carried out once an hour, started 6–10 PM, for three days on lunar period. The observation were conducted during the nursery, maximum tillering, and grain filling phases. upen capture, females were transferred to rearing cages until they laid all their eggs. Moth reproductive status, fecundity, and fertility were counted and analyzed. Total of captured female S. incertulas moths in the lunar period from three phases of rice was 216 individuals. In the nursery phase, the highest population level was obtained at 8 PM at 27.8%, While the maximum tillering and grain filling phase were 39.3 and 29.1% at 7 PM. The highest population level of virgin, mating, and post-oviposition moths was obtained at 7 PM, at 10,94, 12,52, and 9,64%. The highest average fecundity occurred at 6 PM with 42 eggs/group and the highest fertility was 45,8% at 8 PM. The highest critical reproductive time of female S. incertulas moths occured between 6–8 PM.
Dinamika populasi dan interaksi populasi Scirpophaga incertulas (Walker) dengan Cnaphalocrosis medinalis (Guénee) pada pertanaman padi di Karawang, Jawa Barat: The population dynamic and interaction Scirpophaga incertulas (Walker)’s with Cnaphalocrosis medinalis (Guenee) in rice plantation in Karawang, West Java Anggraeni, Flavia Devi; Anwar, Ruly; Ratna, Endang Sri
Jurnal Entomologi Indonesia Vol 22 No 3 (2025): November
Publisher : Perhimpunan Entomologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5994/jei.22.3.209

Abstract

Larva Scirpophaga incertulas (Walker) seringkali menyerang tanaman padi pada fase vegetatif tumpang tindih dan berkompetisi dengan larva Cnaphalocrosis medinalis (Guénee) di lapangan. Penelitian ini bertujuan untuk menentukan jumlah populasi, nisbah kelamin, dan interaksi  spesies S. incertulas dan C. medinalis pada lahan yang sama. Penelitian dilakukan di Kecamatan Rawamerta, Karawang, Jawa Barat. Populasi ngengat dikoleksi menggunakan perangkap lampu plastik mika berperekat, dan dimulai pukul 19.00 hingga 21.00 WIB selama tiga hari berseling saat ketika puncak penerbangan ngengat di fase persemaian, anakan maksimum, dan padi bunting. Interaksi populasi antar spesies S. incertulas dan C. medinalis diperoleh dari pengamatan gejala kerusakan tanaman padi di lahan percobaan. Gejala serangan kedua spesies diamati dua minggu sekali, dimulai dari tanaman berusia 14 HST hingga 70 HST. Total populasi ngengat S. incertulas dan C. medinalis yang terperangkap berturut-turut paling tinggi 68 individu pada fase anakan maksimum dan 29 individu pada fase persemaian dengan nisbah kelamin 1:2,55 dan 1,8:1. Hasil analisis regresi linier berganda antara intensitas serangan S. incertulas dengan umur tanaman terhadap serangan C. medinalis diperoleh hubungan negatif antar variabel, ditunjukkan dengan persamaan Y = 0,1012- 0,0239X1-0,001124X2. Interaksi serangan S. incertulas terhadap C. medinalis dikategorikan sebagai amensalisme.
Co-Authors Endang Sri Ratna Ruly Anwar