STUDY ON RICE DISEASES IN NATIVE GLUTINOUS RICE VARIETIES
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Abstract
In the growing season of 1983, fifty native glutinous rice varieties were transplanted in the paddy conditions at Multiple Cropping Centre, Faculty of Agriculture, Chiang Mai University, to allow natural infection of rice diseases to occur. Results from observation showed that two distinctive rice diseases occurred throughout the season: bacterial leaf blight caused by Xanthomonas campestris pv. oryzae and fungal disease, sheath blight caused by Rhizoctonia Solani. About 30 days after transplanting, initiation of these two diseases were recognized on the rice plant. As the growth stage of the plant advanced toward maturity, increasing severity of the diseases was recorded. Most of these rice varieties showed reactions of moderate susceptibility to the diseases at the reproductive stage. In addition, five other diseases were found but on some particular varieties only. These diseases were described as narrow brown leaf spot (Sphaerulina oryzina), bakanae (Gibberella fujikuroi), brown leaf spot (Cochliobolus miyabeanus), bacterial leaf streak (Xanthomonas campestris pv. Oryzicola), and orange leaf disease.
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References
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