Abstract
Damage on rice during storage including damage on quantity and quality is caused by Sitophilus zeamais. The study aim was to evaluate the susceptibility and damage of rice from various rice varieties to the attacks of S. zeamais. Types of rice used in the research were varieties of IR64, IR65, IR66, Ciherang, Mekongga, Rojolele, and Sintanur. The method was with no-choice assay with observed variables were F1 progeny number, the median of development time and rice damage. The results showed that the rice type had different levels on susceptibility to S. zeamais. Rice from IR65, Mekongga, Rojolele, and Sintanur varieties were classified as moderate to susceptible varieties, while IR64 and IR66 were classified as moderate varieties and Ciherang was classified as susceptible variety. A high rice damage occured in the type of rice classified of susceptible to S. zeamais. There was a significant negative correlation between susceptibility index of rice with dimensions of rice width (r = -0.75*, P <0.05) and median of development time of S. zeamais (r = -0.78*, P <0.05) and positive correlation with number of F1 S. zeamais (r = 0.86**, P <0.01) and the percentage of rice powder (r = 0.71**, P <0.01). Rice that is easily attacked by postharvest pest insects should not be stored for long period of time.
Highlights
Damage on rice during storage including damage on quantity and quality is caused by Sitophilus zeamais
The results showed that the rice type had different levels on susceptibility to S. zeamais
Kernelkernel interactions and behavioural responses of the adult maize weevil Sitophilus zeamais Motshchulsky (Coleoptera: Curculionidae)
Summary
Program Studi Agroekoteknologi, Fakultas Pertanian, Universitas Malikussaleh, Jalan Banda Aceh-Medan, Kampus Reuleut, Muara Batu, Kabupaten Aceh Utara Kode Pos 24355. Penelitian bertujuan untuk mengevaluasi tingkat kerentanan dan kerusakan beras terhadap serangan S. zeamais. Jenis beras yang digunakan dalam penelitian yaitu beras dari varietas IR64, IR65, IR66, Ciherang, Mekongga, Rojolele, dan Sintanur. Metode uji tanpa pilihan dengan variabel yang diamati yaitu jumlah F1, median waktu perkembangan, dan kerusakan beras. Hasil penelitian menunjukkan bahwa beras dari varietas padi berbeda memiliki tingkat kerentanan yang berbeda terhadap S. zeamais. Kerusakan beras yang tinggi terjadi pada jenis beras yang rentan terhadap S. zeamais. Terdapat korelasi negatif yang nyata antara indeks kerentanan beras dari beberapa varietas padi dengan dimensi beras yaitu lebar beras (r = -0,75*; P < 0,05) dan median waktu perkembangan S. zeamais (r = -0,78*; P < 0,05) serta korelasi positif yang nyata dengan jumlah F1 S. zeamais (r = 0,86**; P < 0,01) dan persentase bubuk beras (r = 0,71**; P < 0,01). Beras yang mudah diserang oleh serangga hama pascapanen sebaiknya tidak disimpan dalam jangka waktu yang lama
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