PARIS/ MILAN( Reuters)-Italian pasta makers are fearful of a substantial supply squeeze in the coming months after this summer's durum wheat price shock, as the market runs out of ways to offset a dire harvest in top exporter Canada.... " The situation with durum wheat is very serious." WEATHER SHIFTSSupply from this year's harvests may be even lower than anticipated.... Unfavourable local crop reports in Canada suggest its official durum production estimate may be cut again in December, Omnes