What do large numbers of scale insects form on plants?

Large numbers of scale insects on plants create a crust-like formation, which is often a result of their feeding habits and the waxy secretions they produce. Scale insects tend to attach themselves to the stems, leaves, and fruits of plants, effectively sucking the sap and leading to their proliferation. As they reproduce and aggregate in significant numbers, the accumulation of their exoskeletons or any waxy materials they secrete forms a crusty substance on the plant surfaces.

This crust can have detrimental effects on the plant, leading to weakened growth or even death in severe infestations. The crust not only signifies the presence of these pests but also can create a habitat that makes it harder for beneficial insects or predators to access the scale insects. Understanding this formation is essential in pest management strategies to protect plant health effectively.