WEATHER ANALYSIS WITH BILLING'S SPRING SYSTEM IN RELATION TO THE POTENTIAL RISK OF FIREBLIGHT OUTBREAKS IN ITALY.
On the basis of the corresponding PFA diagrams, the are as of the Po Valley had similar patterns for most years even if there are some differences in detail. It seems that in most years epidemic primary pear blossom infection is unlikely and the risk of any such infection appears to be low or moderate. Amongst the five areas of the Southern Tyrol, Silandro presents a low infection risk before, during and after the apple bloom. The assessment made in the other four areas suggests that they may present favourable conditions for potential outbreaks of fireblight following blossom infections and the risk tends to increase during the season and reaches high levels in the post-bloom periods. This latter trend is common to all the Po Valley areas considered.