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大约在1991年内,许多宣传性材料刊出一种会导致所有杜鹃花属与榆树有同样命运的新瘟疫,大部分报导还作了不确切和夸张的保证.事实上,70年代末和80年代初,在英格兰南部和威尔士首次于杜鹃花属上发现一种粉状霉,并逐渐波及全国,为此引起了极大轰动,1984年达及苏格兰西部,而后迅速蔓延苏格兰.最近,笔者在西北美洲和新西兰也发现了此病.
Around 1991, many propaganda materials published a new plague that led to the same fate of all rhododendrons and elm trees, with most of the reports giving inaccurate and exaggerated guarantees. In fact, in the late 1970s and 1980s, At first, a powdery mildew was found on Rhododendron for the first time in southern England and Wales, and caused a great stir in this country. It reached the west of Scotland in 1984 and then spread rapidly to Scotland. Recently, The disease is also found in the Americas and New Zealand.