Journalartikel

Jahr der Veröffentlichung: 1993

Seiten: 299-307

Zeitschrift: Zeitschrift für Pflanzenkrankheiten und Pflanzenschutz = Journal of plant diseases and protection

Bandnummer: 100

Heftnummer: 3

ISSN: 0340-8159

Verlag: Ulmer

Abstract: 
The relationship between blast disease and the airborne concentration of conidia of Pyricularia grisea was quantified based on measurements from three upland rice field experiments. The concentration of conidia measured with a volumetric spore trap showed large day-to-day fluctuations and a mid-season maximum. Disease severity was assessed quantitatively and partitioned into components: leaf blade lesions of four age categories, collar lesions, and panicle lesions. Crop density was also measured. Young leaf lesions of age classes 1-3 were positively correlated with airborne inoculum, and the correlations were highest when disease severity was adjusted for crop density (r = 0.52 to r = 0.60). Old leaf lesions (class 4) and collar lesions did not correlate with inoculum density, and panicle lesions showed a small negative correlation. Spore catch data were regressed on disease data by forcing all disease components and crop density variables into a multiple regression analysis. The adjusted R2 of the regression equations for each season ranged from 0.65 to 0.69. The regression equations were used to predict the spore catch, and a good fit between observed and expected spore catch was obtained, with R2 ranging from 0.66 to 0.72. Thus, most of the variability in spore catch data could be explained by the disease severity, the age stratification of the lesion population, and crop density. The usefulness of these findings for forecasts is explained.

Harvard-Zitierstil: PINNSCHMIDT, H., KRANZ, J. and BONMAN, J. (1993) INFLUENCE OF BLAST DISEASE IN UPLAND RICE ON THE CONCENTRATION OF AIRBORNE CONIDIA OF PYRICULARIA-GRISEA, Zeitschrift für Pflanzenkrankheiten und Pflanzenschutz = Journal of plant diseases and protection, 100(3), pp. 299-307

APA-Zitierstil: PINNSCHMIDT, H., KRANZ, J., & BONMAN, J. (1993). INFLUENCE OF BLAST DISEASE IN UPLAND RICE ON THE CONCENTRATION OF AIRBORNE CONIDIA OF PYRICULARIA-GRISEA. Zeitschrift für Pflanzenkrankheiten und Pflanzenschutz = Journal of plant diseases and protection. 100(3), 299-307.