Chinese wax scale

Systematic position: The Chinese wax scale (Ericerus pela) belongs to the order Hemiptera and the family Coccidae. This species is taxonomically significant and is historically recognized for its industrial-scale production of white wax, which is harvested by local industries in its native range.

Host plants: This pest primarily targets trees within the genus Fraxinus (ash trees). It can also be found on Ligustrum (privet), Hibiscus, and various citrus trees. The scale prefers young, succulent shoots where it can easily penetrate the bark to feed on the plant's phloem sap.

Biology and life cycle: The life cycle consists of the egg stage, the mobile crawler stage, and the sedentary adult stage. The crawlers are the primary means of infestation as they disperse throughout the canopy. Once they settle, they secrete a distinctive white, waxy substance that acts as a protective shield during their development.

Damage and pest significance: Damage is caused by the nymphs and females feeding on sap, which depletes the tree's energy reserves. Key symptoms include significant growth retardation, chlorosis, and the development of sooty mold on the honeydew secreted by the insects. Heavy infestations can lead to limb dieback and structural tree damage.

Protection measures: Effective management relies on timing insecticide applications to coincide with the crawler stage, as this is when the insects are most vulnerable. Cultural control methods, such as pruning and destroying heavily infested branches, help reduce population density. Maintaining tree vigor through proper fertilization and irrigation also enhances resistance.