A manual of rice seed health testing - IRRI books - International Rice ...
A manual of rice seed health testing - IRRI books - International Rice ...
A manual of rice seed health testing - IRRI books - International Rice ...
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CHAPTER 9<br />
Viruses and mycoplasmalike organisms<br />
T.W. Mew and S.D. Merca<br />
Twenty-one <strong>rice</strong> viruses and<br />
mycoplasmalike organisms have<br />
been reported. The majority (17) are<br />
vector-transmitted. The rest are mechanically<br />
transmitted (mosaic viruses),<br />
soil-transmitted (necrosis mosaic<br />
viruses), and two are confirmed<br />
as <strong>seed</strong>-transmitted (wrinkled stunt<br />
virus and witches’ broom virus).<br />
Ou (1985) reported that wrinkled<br />
stunt and witches’ broom viruses<br />
were first observed in 1976 and 1978,<br />
respectively, in a breeding plot in<br />
Surinam, South America. He noted<br />
they were <strong>seed</strong>borne. Dr. F. Klas <strong>of</strong><br />
the Agricultural Experiment Station<br />
in Paramaribo, Surinam, also confirmed<br />
that wrinkled stunt virus is<br />
<strong>seed</strong>borne (Ou 1985).<br />
The two <strong>seed</strong>borne diseases appear<br />
confined to Surinam. Seed<br />
<strong>health</strong> <strong>testing</strong> for these two diseases<br />
has not been established.
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