Pasania scale

Neoasterodiaspis pasaniae is a scale insect belonging to the family Asterolecaniidae within the order Hemiptera. This pest is specifically adapted to feed on woody plants, particularly those within the Fagaceae family, causing significant physiological stress to its hosts in both wild and cultivated landscapes.

The insect thrives by colonizing the bark of young shoots and stems, where it remains sedentary for most of its life. Because it blends in with the bark of its host plants, it can easily go unnoticed until the infestation levels are severe enough to cause visible decline in the health and vigor of the affected trees.

Its biological cycle is driven by the crawler stage—mobile first-instar nymphs that disperse to new feeding sites. Once a crawler settles and begins to feed, it secretes a protective, often wax-like covering, or test, which protects it from predators and environmental stressors, while also serving as a barrier against many topical chemical treatments.

The damage caused by Neoasterodiaspis pasaniae is primarily due to nutrient depletion. Constant sap extraction results in branch dieback, leaf yellowing, and general stunted growth. In severe cases, the proliferation of scale insects can lead to the death of young plants or significantly diminish the aesthetic value and ecological resilience of mature trees.

Effective management requires a proactive approach centered on timing and method selection:

• Monitor for crawler emergence during the early growing season to apply controls when they are most vulnerable.
• Apply systemic insecticides that are absorbed into the vascular system of the tree.
• Utilize horticultural oils to smother overwintering stages.
• Implement strict sanitation practices, including pruning and removing heavily infested branches.