Abstract
Wheat take-all, caused by two variants of the fungus Gaeumannomyces gramnis (Sacc.) Arx & D. Olivier, was common in spring wheat areas in northwest and north China and occurred in winter wheat areas in north China. The yield of common disease areas was reduced by more than 20% and the yield of severe cases was reduced by more than 50%. Large-scale rapid and accurate estimation of the incidence of wheat take-all plays an important role in guiding field control and agricultural yield estimation. In this study, a portable ground spectrometer was used to collect the spectral reflectance in the 350–1050 nm band range of wheat canopy after take-all infection in the wheat grain filling stage and combined with the ground disease survey data.Then a winter wheat take-all disease index estimation model was proposed based on the spectral band division interval and selected band combination. According to the normalized difference spectral index (NDSI) and the determinative coefficient of the disease index formed by any two band combinations, the spectral index band combinations corresponding to the spectral index with high correlation in each region were screened by dividing spectral intervals. Partial least-squares regression was used to establish a binary and ternary disease index calibration model. The results showed that the model based on spectral indices of ternary variables had the highest coefficient of determination. Finally, the optimal regression model of wheat take-all disease condition index composed of NDSI(R590,R598), NDSI(R534,R742) and NDSI(R810,R834) was established: Y = 134.577 − 70.301 NDSI(R590,R598) − 223.533 NDSI(R534,R742) + 51.584 NDSI(R810,R834) (R2 = 0.743, RMSEP = 0.094, df = 15), which was the most suitable model for winter wheat take-all estimation. The construction of this model can provide new method and technical support for future evaluation and monitoring of wheat take-all disease on the field.
Highlights
The take-all wheat disease caused by the fungus of the Gaeumannomyces graminis (Sacc.) Arx & D
These funguses mainly overwinters and oversummers on the diseased residues left in the soil or mixed with the diseased residues on the unripe manure and the seeds mixed with the diseased residues, which become the main infection of the subsequent wheat source
The take-all wheat disease has spread to vast areas and led to large quantity of lost [1]
Summary
The take-all wheat disease caused by the fungus of the Gaeumannomyces graminis (Sacc.) Arx & D. These funguses mainly overwinters and oversummers on the diseased residues left in the soil or mixed with the diseased residues on the unripe manure and the seeds mixed with the diseased residues, which become the main infection of the subsequent wheat source. The main reason for the occurrence of the disease-free area is the mixed seeds with diseased and residual seeds. The take-all wheat disease has spread to vast areas and led to large quantity of lost [1]. It is of great significance to strengthen the monitoring and early-warning research on this disease to ensure the high and stable yield of wheat
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