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- W2114985280 abstract "Savary, S., Castilla, N. P., Elazegui, E A., McLaren, C. G., Ynalvez, M. A., and Teng, P. S. 1995. Direct and indirect effects of nitrogen supply and disease source structure on rice sheath blight spread. Phytopathology 85~959-965. Effects of nitrogen and type of disease source on focal expansion of rice sheath blight (caused by Rhizoctonia solani) were studied in. two field experiments. Four disease source types, represented by inoculated individual hills at the center of experimental plots, were obtained by combining two inoculum doses with two heights of inoculation in the canopy. Compared with the low inoculum dose, there was a small but significant increase of disease severity on source hills with the higher inoculum dose, and no disease developed on noninoculated controls. Severity on the sheaths was higher on hills inoculated at the sheath level than on hills inoculated at the leaf level. Conversely, leaf severity was higher on hills inoculated at the leaf level than on hills inoculated at the sheath level. Increased nitrogen supply increased host plant tissue contacts (leaf-to-leaf and leaf-to-sheath), increased the capacity of the canopy to retain moisture, and increased the leaf nitrogen content in both experiments. The size of sheath blight foci was much larger in the rainy (3,000 to 30,000 cmz) than in the dry (250 to 1,100 cm2) season. In both experiments, foci expanded most rapidly in the high nitrogen supply (120 kg per ha) level compared with medium (80 kg per ha) and no nitrogen supply. Positioning of inoculum in the upper layer of the canopy (leaf level) on source hills resulted in faster spread of foci than positioning in the lower layer (sheath level). Multiple regression and path coefficient analyses suggested that nitrogen drives focal expansion in sheath blight essentially via indirect effects: increased tissue contacts in the canopy and higher leaf wetness." @default.
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- W2114985280 date "1995-01-01" @default.
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- W2114985280 title "Direct and Indirect Effects of Nitrogen Supply and Disease Source Structure on Rice Sheath Blight Spread" @default.
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- W2114985280 doi "https://doi.org/10.1094/phyto-85-959" @default.
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