Camellia scale

Systematic position: The Camellia scale (Parlatoria camelliae) belongs to the order Hemiptera and the family Diaspididae. These are armored scale insects known for being significant pests in both greenhouse environments and outdoor subtropical settings, where they thrive by extracting plant nutrients.

Host plants: This pest has a broad host range, including Camellia species, citrus trees, azaleas, mango, and laurel. They typically infest leaves, often aggregating along the midrib, as well as succulent stems and occasionally the surface of fruits, which can impact crop quality.

Biology and life cycle: The life cycle consists of the egg stage, the crawler stage, and the sedentary adult stage. Female scales develop a hard, protective waxy cover, often dark brown in color. Crawlers are the dispersive stage, moving to new sites before settling down to feed and develop their own protective armor, completing the cycle.

Nature of damage and pest status: Feeding by the Camellia scale causes chlorosis, leaf yellowing, and eventual leaf drop. Severe infestations lead to stunted growth, distorted shoots, and a significant loss of aesthetic value for ornamental plants. High densities of these insects can lead to overall plant decline and increase susceptibility to secondary infections.

• Routine inspection of leaf undersides and stems for early detection.
• Application of systemic insecticides specifically during the crawler emergence window.
• Use of horticultural oils to suffocate sedentary adults and young nymphs.
• Pruning and destroying severely infested plant parts to reduce the inoculum.
• Implementing strict quarantine measures when introducing new plants into the garden or nursery.