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The damage from natural epidemics of bacterial leaf blight (BLB) of rice caused by Xanthomonas oryzae pv. oryzae was examined in 400 farmers’ fields in four rice-growing districts of India during the wet seasons between 1995 and 1998. One hundred contiguous farm fields were rated for BLB on a 0–9 scale. Disease prevalence at levels above the economic threshold (score >5) ranged from 7 to 39%. Studies...
A database created from insecticide control experiments conducted under the All-India Coordinated Rice Improvement Project from 1965 to 1992 was used to derive empirical estimates of yield losses caused by stem borers. Each unit percent damage due to white earhead damage had a much greater impact on rice yield in the irrigated ecosystem than did damage due to dead heart. White earhead damage occurs...
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