Abstract
<p class="KataKunciInggris">White Root Fungus Disease (JAP) is the biggest threat in rubber. The attack can result in a significant reduction in number, especially in plants lasting 0-3 years. The pathogen that causes white fungus is Rigidoporus lignosus. In JAP endemic areas, decreased tree density 40-50%. In rubber seedlings, symptoms of JAP attack with yellowing color leaves, then dry and fall. This study was conducted at STIP-AP Medan from January 2017 to June 2017. The aim of the study was to determine the effectiveness of several doses of hexaconazole. This study uses a non-factorial Randomized Block Design (RBD) with four replications. Hexaconazole fungicides are active with treatment of A0, A1, A2, A3 and A4 (0, 5, 10, 15 and 20 ml / l air). The results of this study indicate that A2 application of hexaconazole-active fungicides (10 ml / l air) has been effective in controlling JAP disease in rubber seedlings.</p>
Highlights
White Root Fungus Disease (JAP) is the biggest threat in rubber
This study was conducted at STIP-AP Medan from January 2017 to June 2017
Hexaconazole fungicides are active with treatment of A0, A1, A2, A3 and A4 (0, 5, 10, 15 and 20 ml / l air)
Summary
Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) non faktorial yang terdiri dari 5 perlakuan dan 4 ulangan. Masing–masing perlakuan terdiri dari 3 unit bibit percobaan, sehingga jumlah bibit yang digunakan adalah 60 bibit percobaan. Perlakuan yang diuji adalah dosis fungisida “A” berbahan aktif heksakonazol: A1 = 0 ml / bibit / minggu. 12 bulan, sumber infeksi JAP dari akar pohon karet yang sudah terserang JAP yang diperbanyak pada batang ubi, dan naungan. Peralatan yang digunakan adalah botol eks infus sebagai alat aplikasi fungisida, gelas ukur, spuit untuk memasukkan larutan fungisida ke dalam botol infus, cangkul, meteran, dan parang. Antar blok perlakuan/plot ulangan dibuat jarak 30 cm untuk menghindari terjadinya kontak akar dari bibit batang bawah dari Pusat Penelitian. Jarak tanam antar bibit yaitu 25 cm dengan kedalaman tanam 50 cm
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