Puccinia tritici Infection Model

Puccinia tritici infections are taking place after x) some hours of leaf wetness at optimum temperature conditions. The fungus can infect over a wide range of temperatures. x) The model assumes that infection needs an accumulated hourly air temperature of 90°C of leaf wetness in an air temperature range from 5°C to 30°C.

  • Leaf wetness for accumulated hourly average temperatures for 90°C
    • <(if T <= 22.5°C then ∑(Th) else ∑ (22.5-(Th-22.5))
    • 5°C < Temp. < 30°C

In FC the Puccinia tritici infection is shown by the yellow line (see above). Conditions are similar to P. graminis, but with a lower temperature threshold of 5°C. If 100% infection is shown a curative plant protection measurement has to be taken into account (systemic application). If the risk is at 80% and the wheater forecast will predict more leaf wetness periodes protective leaf applications could be taken.