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Studies on the Cause of Leaf Yellowing of Amomum villosum Lout. from Yunnan and Its Prevention Seasonal Changes in Leaf Magnesium and Boron Contents and Their Relationships to Leaf Yellowing of Navel Orange（Citrus sinensis Osbeck） Molecular identification and detection of Eucalyptus yellowing and witches-broom phytoplasma in Guangdong Seasonal Changes in Leaf Magnesium and Boron Contents and Their Relationships to Leaf Yellowing of Navel Orange（Citrus sinensis Osbeck） Studies on theMa in Causal Factors Affect Cinnam om um cam phorYellowing in Urban Condition