Surveys of cereal diseases and pests in the Netherlands. 4. Occurrence of powdery mildew and rusts in winter wheat

Autor: R. W. Stubbs, W. Stol, R. A. Daamen
Rok vydání: 1992
Předmět:
Zdroj: Netherlands Journal of Plant Pathology. 98:301-312
ISSN: 1573-8469
0028-2944
DOI: 10.1007/bf01974388
Popis: Results of annual surveys of winter wheat fields from 1974 to 1986 were compiled to describe epidemics of powdery mildew and rusts in relation to weather and cultivar resistance. An average of 29 and 70% of fields were infected by powdery mildew in May and July, respectively. Mildew prevalence in May was positively correlated with average temperature in October and with average temperature over the months December, January, February and March. In addition, it was correlated negatively with the average grade of mildew resistance of the cultivars sown each year. Prevalence of mildew in July did not show consistent correlations with weather characteristics nor with mildew prevalence in May. Yellow rust was usually not detected in May and on average 18% of the fields was infected in July. The occurrence of yellow rust decreased after 1977, when the farmers adopted cultivars resistant or moderately resistant to yellow rust. Brown rust was usually not detected in May, while in July on average 48% of the fields was infected. Brown rust intensity in July was high in years with a high March temperature and high precipitation during April and May. Black rust was rare in the Netherlands, with 3 and 1% of the fields infected in July 1977 and 1981, respectively.
Databáze: OpenAIRE
Externí odkaz: