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Corn Fusarium Infection Model


Maisfusarium1 1 Corn and Wheat is susceptible for fusarium infections in BBCH stage 61 to 75. After stage 75 the model is only used in case of heavy infestations of the European Corn Borer.
The fungal agents belonging to the Fusarium Head Blight complex on corn are known to be favoured by warm temperatures of 20 °C to 30 °C and long humid periods. Several day long leaf wetness periods will lead to early visible symptoms. But Symptoms can be seen after a longer latency period if the infection is followed by and 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, which we found in literature we decided to point out Fusarium Head blight Infections if temperature and leaf wetness period or periods with more than 85% relative humidity are exceeding the values visualised in the following graph.

 Infections are started, when airtemperature is between 2 and 32°C and rain sum by 2 mm or more or rel. humidity of more than 85%.  Infection increases when rel. humidity stays equal or more than 85% (when no leaf wetness occurrs). But if rel. humidity decreases lower as 85%r.h. the infection progress stops.

Fusarium Head Blight Infection can be assumed if the infection progress value reaches 100%. The calculation of this progress value follows the relation in between the duration of moist conditions and the temperature displayed in the graph above.
 

Fusariuminfcurven1 This model is used to visualise the infection days and the climate conditions. The growers knowledge about the development stage of the different wheat varieties he grows, which gives him the possibility to access if he should apply a curative spray immediately after infection.










Referencees: 

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.