From the paper...
[...snip...]
In order for the powdery mildew epidemic to begin, the pathogen requires three consecutive days when there is a minimum of 6 hours of temperatures between 21 and 30°C. If three consecutive days at these temperatures are not met, the index reverts to zero. For each day that this requirement is met, 20 index points are assigned. After 3 days, an index of 60 would be achieved thus triggering the index. Once the 3 consecutive day requirement is met, it no longer is a function of the model. The model will fluctuate between 0 and 100. Losing 10 points on days when the 6 hour requirement for 21-30°C was not met or
if at any time during the day, the temperature rose to 35°C for at least 15 min. An index of 60-100 indicates the pathogen is reproducing every 5 days while an index of 0-30 indicates a reproductive rate of 15 days or less. An index of 40-50 is considered normal and would imply a reproductive rate of 8-11 days, i.e., somewhere between a 5 and 15 day reproductive rate.
[snip]
So how about cooking the pm? 15 minutes above 35C every n days? Any thoughts? Would it cook the plant too?7