Investigation on Species of Spider Mites Damaging Broad-leaved TreesandAcer rubrumDamaged by Oligonychusilicis in Shanghai Gardens

Field investigations were carried out on species of spidermites damagingbroad-leaved trees in Shanghai gardens from July to December in 2018, as well as on Oligonychusilicisdamaging Acer rubrum.The results showed that there were 17 species, among them, three newspeciesrecords in China, namely Oligonychuscastaneae, Eotetranychusnomurai and O.ilicis.Tetranychuskanzawaiwas found for the first time damagingMagnolia denudata, EuseiusnicholsidamagingKoelreuteriapaniculata and Sapindusmukorossi.The investigation demonstrated that the damage of O.ilicistoA.rubrum lasted until mid-October and it did not overwinter on the leaves.