根据牡丹叶尖枯病的症状特点和田间扩展方式，以及对大气和牡丹叶片中氟浓度的测定，结果证实牡丹叶尖枯病是由大气氟污染引起的一种非侵染性病害。污染区的牡丹在生长季节叶片不断地吸收氟化物，当叶片中氟浓度超过了其能够耐受的限度时，即表现枯死症状。由于氟化物在叶片中会随着蒸腾流向叶尖，而使叶尖的氟浓度较高，故枯死症状先在叶尖出现。 According to the symptom characteristics of peony leaf blight and field expansion, as well as the determination of fluoride in leaves of atmospheric and peonies, the results showed that peony leaf blight was a non-invasive disease caused by atmospheric fluorine pollution. Peonies in the contaminated area continue to absorb fluoride during the growing seasons, and show signs of lethargy when the fluoride concentration in the leaves exceeds their tolerable limit. As fluoride in leaves will flow to the tip of the tip, leaving the tip of the fluorine concentration higher, so the first symptom of dead appear in the tip.