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RADEN RORO KEIKO FEBRIANTI AYUDHIA SAMBOEDJO

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Abstrak (Bhs. Indonesia)

Penelitian ini bertujuan untuk mengetahui pengaruh Bio P60 dengan bahan aktif Pseudomonas fluorescens P60 dalam mengendalikan penyakit hawar daun yang disebabkan Phytophthora infestans (Mont.) de Bary serta pertumbuhan dan produksi tanaman kentang. Penelitian dilakukan di lahan yang berada di Desa Serang, Kecamatan Karangreja, Kabupaten Purbalingga serta di Laboratorium Perlindungan Tanaman, Fakultas Pertanian, Universitas Jenderal Soedirman dari bulan April 2012 sampai Juli 2012. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) yang terdiri atas enam perlakuan dengan empat kali ulangan. Perlakuan meliputi kontrol, perendaman bibit 15 menit, penyiraman dan penyemprotan Bio P60 sebanyak 1, 3, 5, dan 7 kali dengan dan aplikasi fungisida.  Variabel yang diamati meliputi masa inkubasi, intensitas penyakit, laju infeksi, kepadatan akhir Pseudomonas fluorescens P60, selisih tinggi tanaman, panjang akar, bobot segar dan kering tanaman, jumlah umbi, jumlah cabang, jumlah daun, bobot segar dan kering akar, dan bobot hasil/tanaman dan analisis jaringan. Hasil penelitian menunjukkan bahwa perlakuan Bio P60 7 kali belum efektif menunda masa inkubasi dan menekan intensitas penyakit hawar daun pada tanaman kentang. Perlakuan Bio P60 7 kali meningkatkan selisih tinggi tanaman dan bobot hasil/tanaman masing-masing sebesar  15,48 dan 43,06%.

Abtrak (Bhs. Inggris)

This research was aimed at knowing the effect of Bio P60 with material active Pseudomonas fluorescens P60 on controlling late blight disease caused by Phytophthora infestans (Mont.) de Bary and on growth and yield of potato. The Research was carried out at potato  field at Serang village, Karangreja subistrict, Purbalingga regency and at the Laboratory of Plant Protection, Faculty of Agriculture, Jenderal Soedirman University from April 2012 until July 2012. Randomized Block Design was used which six treatments and four replicates. The treatments tested were control, soaking of seedling for 15 minutes,dranching, and spraying Bio P60 for 1, 3, 5, and 7 times and spraying the fungicide. Variables observed were incubation period, disease intensity, infection rate, late population of Pseudomonas fluorescens P60, difference of crop height, root length,  fresh and dry of crop weight, number of tubers, number of branches, number of leafs,  fresh  and dry of root weight, weight of yield/crops, and tissues analysis. Results of the research showed  treatment Bio P60 for 7 times could not slowness the incubation period,  and supress the disease intensity on potato. However, both treatment could increased the difference of crop height and yield crops as 14.38 and 43.06%, respectively.

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