Morphological and damage characteristics of Aceria magnoliae on Yulania denudata and its occurrence in Shanghai
Aceria magnoliae is a newly recorded pest of Yulania denudata in China in recent years.In order to understand the morphology and damage characteristics of A.magnoliae as well as its damage to ornamental plants in the urban area of Shanghai,we made slide specimens of A.magnoliae for observation under the microscope.Abnormal leaves,fruits,branches and other parts of Y.denudata were collected for observation of the pest and its damage symptoms under the anatomical microscope.The occurrence of A.magnoliae was investigated in 24 sample sites distributed across eight central urban districts of Shanghai.The results showed that A.magnoliae mainly damaged the leaves and immature fruits of Y.denudata,and the pest were observed congregating on both sides of the veins on the back of the leaves and subsequently transferring to the young fruits.The plant damage rate was 100％in 15 of the 24 sample sites,with the damage rate of the leaves ranging from 10.89％to 99.24％.The pest is characterized by aggregation within the same branches.
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