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Imprint
Development of an Innovative Forecasting Model to Control Powdery Mildew (Podosphaera macularis) in Hops (Humulus lupulus)
Project
Project code: 2814202906
Contract period: 01.05.2007
- 31.12.2009
Budget: 83,876 Euro
Purpose of research: Experimental development
The distribution of spores from an origin of infection is limited to a few 100 m. Infection happens almost exclusively at leaf pairs 2 to 4. Leaf pairs beyond level 4 are age resistant. Early during the growing season, leaves are hightly susceptible and the incubation period is five days. As of mid-June, leaf pairs 2to 4 also become resistant and infections decrease significantly. Light intensity and temperature have great influence on infestation degree and incubation period, optimal are 12-23 °C. The temperature gradient between day and night has great influence on propagation of spores and the infection, ideally it comprises less than 5 °C. Moistness of leaves, wind and rain have only little influence and relative humidity has no influence on the infection. Conclusions: Powdery mildew control during spring is essential. Control measures outside the indicated infection periods are ineffective. During midsummer, even slight infestations together with favourable climatic conditions can lead to new infections that can become relevant to yield. If a stand is completely free of infestation late in June, a new infection during the growing season can be excluded.
Section overview
Subjects
- Crop Protection
- Specialised crops
