The study of host range and population dynamic of B. tabaci in red chili pepper fiel dswas conducted in Sub-district of Pakem, District of Sleman, Province of Daerah Istimewa Yogyakarta during dry season of May-October 2009. The study of host plants of B. tabaci from the red chili pepper fields revealed that there were 27 species of host plants belong to 22 genera of 13 families including crops and weeds. The host plants belong to families of Araceae, Amaranthaceae, Asteraceae, Brassicaceae, Capparidaceae, Convolvulaceae, Euphorbiaceae, Lamiaceae, Oxalidaceae, Papilionaceae, Rubiaceae, Solanaceae and Sterculiaceae. The host plant families of Asteraceae and Euphorbiaceae had the most abundant population of B. tabaci. Geminivirus-like symptoms were found in the weeds of A. conyzoides and A. boehmerioides. Population of B. tabaci adults correlated with abundance of host plant species found in the red chili pepper fields. The population of B. tabaci in red chili pepper fields was affected by natural enemy population. Population dynamic of the parasitoid Eretmocerus sp. correlated with population dynamic of the parasitized nymph of B. tabaci. Parasitoid Eretmocerus sp. was potentially good in controlling population of B. tabaci nymph in red chili pepper fields.

Hama kumbang bubuk, Sitophilus oryzae (Coleoptera: Curculionidae) merupakan hama primer dan menyebabkan kerusakan yang berbeda pada serealia sehingga menentukan tingkat kerentanannya selama penyimpanan.  Kerusakan serealia selama di penyimpanan dipengaruhi oleh kadar air. Penelitian bertujuan mempelajari variasi kerentanan dan kerusakan serealia setelah infestasi S. oryzae berdasarkan kadar air. Penelitian dilaksanakan dalam bentuk faktorial pola Rancangan Acak Lengkap dengan perlakuan jenis serealia dan kadar air.  Perlakuan kadar air yaitu 12% dan 14%, sedangkan jenis serealia yaitu sorgum, beras putih, beras ketan hitam, beras ketan putih, dan jagung. Parameter pengamatan yaitu jumlah F1, median waktu perkembangan, indeks kerentanan, dan susut berat serealia. Analisis data hasil penelitian menggunakan analisis ragam dan Duncan’s Multiple Range Test (DMRT) pada taraf 0,05. Untuk mengukur kekuatan hubungan antar parameter pengamatan ditentukan dengan analisis korelasi. Hasil penelitian menunjukkan bahwa kadar air 14% dapat meningkatkan jumlah F1, indeks kerentanan, susut berat serealia serta median waktu perkembangan yang singkat. Katagori kerentanan serelia bervariasi dari moderat sampai sangat rentan. Jumlah F1, indeks kerentanan, susut berat paling tinggi dan median waktu perkembangan paling singkat dijumpai pada beras ketan hitam.   Beras ketan hitam dengan kadar air 12 dan 14% dapat meningkatkan jumlah F1, indeks kerentanan, susut berat serealia serta median waktu perkembangan yang singkat serta kerentanannya tergolong rentan-sangat rentan sampai sangat rentan

Plasma nutfah padi lokal memiliki sifat keunggulan yang spesifik seperti aroma wangi, pulen, dan tahan terhadap hama. Penelitian tentang ketahanan beras terhadap Sitophilus oryzae dapat dilakukan dengan pengujian kerentanan beras dari berbagai aksesi padi lokal. Beras lokal Aceh belum teridentifikasi memiliki sifat fisik dan kimia sebagai sumber ketahanan terhadap infestasi S. oryzae. Penelitian bertujuan menentukan klasifikasi kerentanan beras dari plasma nutfah padi lokal Aceh terhadap hama S. oryzae selama penyimpanan. Beras lokal Aceh antara lain Sigudang, Segaru, Lilin, Malaya, Aweuh, Cantik Lembayan, Beras Merah, Siwe, Surya, Sitinggong, Sirangkoh, dan Sigupai. Evaluasi kerentanan beras menggunakan metode tanpa pilihan. Hasil penelitian menunjukkan beras lokal Aceh memiliki tingkat kerentanan terhadap S. oryzae yang berbeda-beda. Beras Malaya tergolong moderat, sedangkan beras Sigudang, Segaru, Lilin, Cantik Lembayan, Sirangkoh Mirah, dan Awueh tergolong moderat sampai rentan.  Beras Merah, Siwe, Surya, Sigupai, dan Sitinggong tergolong dalam katagori rentan terhadap serangan hama S. oryzae selama penyimpanan beras.  Kerentanan beras lokal Aceh dipengaruhi kandungan kimia beras seperti kadar air, lemak, protein, dan serat.

Association of antagonistic fungi Trichoderma harzianum Rifai and arbuscular mycorrhizal fungi for controlling the stem  rot disease on soybean.  The research objective was to study effect of application Trichoderma harzianum and arbuscular mycorrhizal fungi (AMF) in controling stem rot disease caused by Sclerotium rolfsii Sacc on soybean.   The research conducted in a Randomized Block Design (RBD) with five treatment levels: (1) without T. harzianum, without AMF, and without S. rolfsii [negative control (C-)], (2) without T. harzianum, without AMF, and S. rolfsii [positive control (C +)], (3) T. harzianum + S. rolfsii; (4) AMF + S. rolfsii, and (5) T. harzianum + AMF + S. rolfsii.  Parameters observed were basal stem rot disease development and yield components. The results showed that the application of a mixture of T. harzianum and AMF caused a longer disease incubation period (8.29 days) and the severity of stem base rot disease was 11.67% number of pods per plant (62.53 pods), the number of seeds per plant (225.05 seeds), and the weight of seeds per plant (27.73 g) were higher than that of the application of T. harzianum and AMF separately.

The lesser grain borer, Rhyzopertha dominica (F.) (Coleoptera: Bostrichidae) is a primary pest that causes damage to stored cereals such as corn, grain, rice, wheat, sorghum, tubers, and starch-containing substrates and packaging made from wood. R. dominica not only cause losses in terms of quantity but also affect quality during the storage period through their feeding activities. The study aimed to determine the level of susceptibility to rice during storage to R. dominica. The research was conducted at the Laboratory of Plant Pest and Disease, Faculty of Agriculture, Malikussaleh University, Aceh  which began from November 2019 to February 2020. The study was done in the form of laboratory experiments using a Completely Randomized Design (CRD) nonfactorial with a total treatment of 10 rice varieties. The results of variance analysis using the Duncan Multiple Range test showed that the susceptibility level of rice to R. dominica infestation was classified into moderate category. The highest percentage of weight loss was found in Mekongga varieties (1,95%) while the lowest in Inpari 30 (0,73%)