Infected rice seed constitute one of the primary sources of inoculum in the perpetuation of Phoma sorghina.
1990
Prabhu A.S.
Phoma sorghina, the causal agent of glume blight, is one of the predominant field fungi associated with grain discoloration in upland rice in Brazil. The seeds are heavily infected, causing varying degrees of discoloration when boots are inoculated with spore suspension by hypodermic infection method. The fungus is transmitted from the seed to cotyledonary and primary leaves without causing any external symptoms. The transmission percentage in artificially infected seeds of 12 rice varieties varied from 26 to 84. The seed infection, however, does not affect germination. Pycnidia are produced on the culm 2.0 cm above the surface of the soil until 60 days after planting. The present information shows the role of infected seed as one of the sources of primary inoculum in the perpetuation of pathogen that does not cause disease symptoms on leaves and culms.
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