Which of the following methods can help prevent spongy moth infestations?

The method of destroying egg masses with soapy water is a practical and effective way to prevent spongy moth infestations. When spongy moths lay their eggs, these egg masses can be identified and treated before they hatch. By applying soapy water, which suffocates the eggs, you can significantly reduce the number of caterpillars that emerge and ultimately lower the risk of an infestation. This technique is environmentally friendly and can be conducted by property owners and land managers alike, providing a hands-on approach to managing the pest population.

In contrast, using only pesticides may not address the root of the problem and can lead to ecological imbalances or resistance in pest populations. Transporting firewood is actually a practice that can spread infestations, as it can carry egg masses or larvae from one location to another. Lastly, avoiding native predators undermines the natural ecosystem, as these predators can help keep pest populations in check, making for a less favorable environment for pests like the spongy moth.