Model of Gray Leaf Spot
Gray Leaf Spot of maize Cercospora zeae-maydis Risk Model:
x) Calculation performed in the time between stage V4 and V12:
x) Number of hours with temperatures from 22°C to 30°C divided by (2.305*2) plus hours of relative humidity > 90% during night divided by (3.30*2). This value can
x) range from 0 to 100.