DIAGNOSIS FOR EARLY DETECTION OF SYMPTOMS OF WHITE WILTING OF RICE PLANT LEAVES
ARMY BIOLOGICAL LABS FREDERICK MD
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The white wilting of rice leaves, commonly called hagare is a bacterial disease causing leaf wilt which is one of the chief dangers to warm area rice cultivation in Japan. This disease has its own peculiar areas of occurrence and manifests a rather local character even in the same warm area. The disease generally has a tendency to break out in paddy fields in low temperature areas near rivers and lakes, especially after flooding or inundation. However, as several varieties of new rice and new methods of fertilizing become more widespread, the disease no longer is restricted to low temperature spots, but has been observed to break out in valley basins and in hilly areas generally regarded as quite dry. In view of the importance of early detection this paper presents a classification of the symptoms of white leaf wilt and describes a simple method of diagnosis to be done in the initial stage of outbreak of the disease.