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Association of Two Types of Virus Particles with Penyakit Habang (Tungro Disease) of Rice in Indonesia. Hiroyuki Hibino, Plant Pathologist, Indonesia-Japan Joint Food Crop Research Program, Central Research Institute for Agriculture, Bogor, Indonesia on leave from Institute for Plant Virus Research, Tsukuba, Ibaraki, Japan; M. Roechan(2), and S. Sudarisman(3). (2)Assistant Plant Pathologist, CRIA, Bogor; (3)Graduate Student from Udayana University, Denpasar, Bali at the Plant Pathology Subdivision, CRIA, Bogor. Phytopathology 68:1412-1416. Accepted for publication 5 May 1978. Copyright 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-1412.

Rice plants with the penyakit habang disease were examined by electron microscopy. Two types of virus particles were detected: isometric particles (I) about 30 nm in diameter, and bacilliform particles (B) about 35 nm in diameter and 150-350 nm in length. Plants showing severe symptoms contained both B and I particles, whereas those showing moderate symptoms contained B particles alone. One of the plants showing no clear symptoms contained I particles alone. The I particles were transmitted by Nephotettix virescens but the B particles were transmitted by the insects only when the I particles had been acquired previously or at the same time. Reactions of eight rice varieties to infection with the B and I particles indicated that so called tungro symptoms were caused by the B particles and that the I particles intensified the symptoms caused by infection with the B particles.

Additional keywords: rice tungro virus, rice waika virus.