Īstās miltrasas attīstība atkarībā no ziemas kviešu genotipa
2017
Bimsteine, G., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture | Rutenberga-Ava, A., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture | Svarta, A., Latvia Univ. of Agriculture Agency, Skriveri, Skriveri Municipality (Latvia). Research Inst. of Agriculture | Berkis, R., Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture
Powdery mildew caused by Blumeria graminis is an obligate parasite with a high degree of host specialization. Growing less susceptible winter wheat varieties is one of the most important options for disease control in integrated plant protection. Investigations were conducted at three investigation sites of the Latvia University of Agriculture within a project of the Laboratory for Testing of Value for Cultivation and Use of Agricultural Crop Varieties (VCU) in 2016–2017. The aim of the present study was to evaluate the development of powdery mildew depending on winter wheat genotypes. The disease severity was assessed three times: during wheat stem elongation (GS 32–35), heading (GS 55–59), and development of fruit (GS 73–75). Totally, 14 different genotypes were tested. Although powdery mildew was observed in all trial places, the disease severity (%) was not similar. In Pēterlauki, average severity of powdery mildew did not exceed 1%. Comparison of the observed winter wheat genotypes revealed that only in some fields and only in 2016 the disease severity achieved an economically important level, i.e. 6–10% (‘KWS Fontas’, ‘Julius’, and ‘KWS Dakotana’). The main conclusion is that winter wheat variety, vegetation season, and location of the trial place influenced the development of powdery mildew. Further investigations are needed for a more precise detection of the influence of winter wheat genotypes on powdery mildew development.
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