Fusarium Head Blight Infection Model
The fungal agents belonging to the Fusarium Head Blight complex on wheat are known to be favoured by warm temperatures 0f 20 °C to 30 °C and long humid periods. Several day long leaf wetness periods will lead to early visible syptoms. But Symptoms can be seen after a longer latency period if the infection is follwoed by an leaf wetness period of 18 hours or even shorter. Symptoms can be found after artificial inoculation at temperatures of 15°C too.
Summarizing all different temperatures and moisture combination we found in literature we descided to point out Fusarium Head bligh Infections if temperature and leaf wetness period or periods with more than 85% relative humdity are exceding the values visualised in the following graph.
Infections are started by a rain of 2 mm. A Fusarium Head Blight Infection can be assumed if the infection progress value reaches 100%. The calculation of this progress value follwos the relation in between the duration of moist conditions and the temperature displayed in the graph above.
This model is used to visualise the infection days and the climate conditions during climate. The growers knowledge about the development stage of the different wheat varieties gives the possibility to decide an application of a curative spray immidiately after infection. The model to access the risk of mycotoxin formation is availabel on this link.
For more Informaiton on Fusarium Head Blight Biology click here.
1) Fusarium Head Blight Risk model which figures out risky time periodes for an infection. Whenever 100% infection (green line) are reached the risk (blue line) is very high and conditions for the fungus have been favourable for infection. In dependance of the application method (curative, preventive) the risky time period is shown by the blue line.
2) Fusarium Head Blight : in this model the infection of the FHB is calculated by precipitation (2mm needed), relative humidity (above 85%) or leaf wetness, temperature during process. If infection reach 100% optimal conditions for the fungal pathogen have been reached. Further on the model figures out the FHB mycotoxin risk (for detailed information about the conditions see this page)
Infektion und Ausbreitung von Fusarium spp. an Weizen in Abhängigkeit der Anbaubedingungen im Rheinland, Lienemann, K.; E.-C. Oerke und H.-W. Dehne
Water activity, temperature, and pH effects on growth of Fusarium moniliforme and Fusarium proliferatum isolates from maize, Sonia Marin, Vicente Sanchis, and Naresh Magan
Interaction of Fusarium graminearum and F. moniliforme in Maize Ears: Disease Progress, Fungal Biomass, and Mycotoxin Accumulation, L. M. Reid, R. W. Nicol, T. Ouellet, M. Savard, J. D. Miller, J. C. Young, D. W. Stewart, and A. W. Schaafsma
Evaluierung von Einflussfaktoren auf den Fusarium-Ährenbefall des Weizens, Wolf, P. F. J.; Schempp, H.; Verreet, J.-A.