Avoiding Diapause > High Humidity

Eggs, larvae, or pupae of some species groups will avoid diapause if exposed to timely high humidity. This is hopefully intutive because these conditions, in the right physiogeographic regions, promote new growth of larval host plants and adult nectar plants.

Always remember that, in the lab, raising caterpillars under high humid conditions isn't ever a good idea unless you're rearing Limenitis species or species from humid habitat. However, it is a good idea to expose multi-voltine pupae to intermittant mist spraying of water to encourage them to emerge.