Japanese Journal of Phytopathology
Online ISSN : 1882-0484
Print ISSN : 0031-9473
ISSN-L : 0031-9473
Studies on Rice Grassy Stunt Virus. I
Toshihiro SENBOKUEishiro SHIKATA
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JOURNAL FREE ACCESS

1980 Volume 46 Issue 4 Pages 487-493

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Abstract

It was shown that japonica rice cultivars, Norin No. 8, Mihonishiki, Yukimochi and Kinmaze, were susceptible to rice grassy stunt disease, and that colonies of brown planthopper, Nilaparvata lugens Stål collected in the fields of Japan were capable of transmitting the disease. The infected japonica rice plants developed typical symptoms of the grassy stunt disease, such as severe stunting, excess tillering, yellowish green and narrowing leaves, scattering rusty spots on the leaves, and erect growth. The host range of the causal agent was limitted only to rice, and the most Graminea, such as maize, wheat, barley, oat, Panicum crus-galli var. frumentaceum Hook, P. milliaceum L. and Coix lachryma-jobi var. frumentaceum Makino, were not susceptible to the disease. No evidence of soil-and sap-transmission was obtained in this experiment. The results of insect transmission suggested that the causal agent of the grassy stunt disease was persistently transmitted by the insect vectors. None of the diseased plants which were treated with sulfanilamide-drugs and antibiotics (tetracycline, chloramphenicol and penicillin) through the roots recovered the symptoms, suggesting that the grassy stunt disease was not mycoplasma-like organism, rickettsia or chlamydia origin. About 10% of the insects artificially injected with the extracts from the infected rice, transmitted the disease.

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