Diadegma semiclausum Hellen. parasitoid (Hymenoptera : Ichneumonidae) is a potential natural enemy to Plutella xylostella Linn. larvae (Lepidoptera : Yponomeutidae) that attacks Brassicaceae crops (crucifers) such as cabbage (Brassica oleraceae var. capitata) and cauliflower (Brassica oleraceae var. italica). The failures of biological control programs caused by the lack of suitable charbohydrate food sources to adult parasitoid, and its effects the adult reproduction, so its important to use food sources which is suitable to D. semiclausum longevity and fecundity for good existence in field. The aim of research is to identification kind of Brassicaceae wild flowers and to get a better Brassicaceae wild flowers as food to D. semiclausum adult parasitoids. This research has been conducted during the periods of Mei to November 2008 in laboratory and screen house of Payakumbuh Agriculture Polytechnic. This research consist of descriptive method to identification and a series with Completely Randomized Design. The last research is testing Brassicaceae wild flowers (Rorippa indica (Nasturtium indicum), Cardamine hirsuta, Bunias orientalis, R. indica (N. heterophylum) as food of D. semiclausum adult parasitoids with four replications. Analysis of variance is performed on the data with SAS Systems. The result of research showed that brassicaceae wild flowers were testing a potential food sources for D. semiclausum adult but no one the best from its.

Bacteria is a potential agent in biological organic fertilizer”s process. The rate of decomposition of organic matter in biological organic fertilizers process depends on the role of funtional bacteria, the type of organic matter and the microenvironment.  Bacteria that are inoculated into biological organic fertilizer’s matter must be synergistic among them, so that their role as as bioactivators more efficient.  A compatibility experiment among the bacteria isolates used as bioactivators have to be done in order to  obtain an effective and efficient biological organic fertilizer. The objevctive of the research is to obtain information on the compatible nature of the bacterial isolates. The research was conducted at the Plant Protection Laboratory of the Payakumbuh State Agricultural Polytechnic, West Sumatra from July to August 2022. The research method began with the rejuvenation bacterial isolates of Bacillus cereus, Bacillus subtilis, Bacillus thuringiensis on NA media, then continued with a compatibility experiment  using the dual culture method on NA and King’s B medium, so there were a total of 12 treatments (single and combination) with three replications. The results of the compatibility experiment on the three Bacillus bacteria did not form a halo inhibition zone and were compatible with the compatibility index value (IK) 0.67-1 on NA medium and 0.90-1.00 on King’s B medium, meaning that the growth between the three Bacillus bacteria did not inhibit each other, so that all Bacillus bacteria could be used as a bioactivator simultaneously in biological organic fertilizer’s process.

Pemberdayaan  musuh alami hama seperti  parasitoid Ooencyrtus malayensis sebagai pengendali hayati walang sangit dapat meminimalisir penggunaan insektisida kimia dan  memiliki nilai positif yaitu mengendalikan hama pada stadia awal perkembangannya. Tujuan penelitian adalah: menentukan distribusi populasi parasitoid pada topografi Sumatera Barat yang berbeda, dan menentukan tingkat parasitisasi, dominansi dan mortalitas parasitoid tersebut. Pengambilan sampel telur walang sangit terparasit di lokasi padi sawah dengan metode stratifield sampling pada tiga ketinggian tempat yaitu: Sungai Sapih Kota Padang, Rendah (20 m dpl ), Tanjung Pati Kabupaten Limapuluh Kota, Sedang (500 m dpl), dan Kubang Putih Kabupaten Agam, Tinggi (975 m dpl). Sampel telur diamati di laboratorium untuk mengetahui telur yang terparasit oleh O. malayensis dan selanjutnya data dianalisis.  Hasil penelitian membuktikan bahwa distribusi parasitoid  O. malayensis lebih dominan pada lokasi lokasi dataran rendah selanjutnya dataran sedang sedangkan pada dataran tinggi tidak ditemukan.  Tingkat parasitisasi pada dataran rendah dan tinggi adalah 13% dan 6%. Sedangkan nilai mortalitas parasitoid O. malayensis pada dataran rendah dan tinggi adalah 17 % dan 33 %.  Dari penemuan ini disimpulkan bahwa parasitoid O. malayensis menyukai lokasi dengan ketinggian rendah dri permukaan laut dan dapat memparasitisasi telur walang sangit dengan tingkat serangan yang cukup tinggi.

Penyakit tanaman merupakan salah satu faktor penghambat untuk meningkatkan produksi tanaman. Hal ini juga menurunkan kuantitas dan kualitas produksi tanaman dan menyebabkan penurunan pendapatan petani, bahkan menyebabkan kehilangan hasil. Pengendalian penyakit tanaman harus dilakukan dengan tepat agar tidak memberikan dampak negatif terhadap lingkungan dan input yang rendah pula. Oleh karena itu, petani harus mengidentifikasi dan memastikan tingkat keparahan penyakit tanaman sebelum melakukan pengendalian. Tujuan dari penelitian ini adalah inventarisasi penyakit tanaman padi di Politeknik Pertanian Negeri Payakumbuh. Metode purposive sampling dan deskriptif digunakan dalam penelitian ini. Berdasarkan penelitian, beberapa penyakit yang ditemukan di lahan sawah yaitu bercak coklat (Helminthosporium oryzae), bercak coklat sempit (Cercospora oryzae), blas (Pyricularia grisea), hawar daun bakteri (Xanthomonas oryzae pv. oryzae), dan smut (Ustilagonoidea virens).