What behavior could lead to the spread of Spongy Moths?

The behavior that could lead to the spread of Spongy Moths is moving active caterpillars to new locations. This action directly facilitates the dispersal of these invasive species, allowing them to infest new areas where they may not have previously existed. Spongy Moths have a broad host range, and introducing them to new environments can result in significant ecological impact, as they feed voraciously on a wide variety of trees.

In contrast, planting more trees in a given area may not directly contribute to the spread of Spongy Moths but could provide additional food sources if they are already present. Creating moth traps is a management strategy aimed at controlling and monitoring populations of Spongy Moths rather than spreading them. Similarly, using insecticides can help manage their population but does not inherently lead to further spread. Therefore, moving active caterpillars remains the most significant risk factor in promoting the spread of this pest.