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Read the humidity section in Sally's article. Humidity is not a set number and it depends on many factors. To figure out the correct humidity, you need to either carefully compare air cell development, or weigh the eggs. Usually you need to increase the humidity for shipped eggs because the air cell are already fairly developed when you receive them. Not only have they been jarred around, but the eggs are also older because they were in the US postal service for 2-3 days.
One more thing about the mites. I read that sevin only kills the mites that are alive. What about the eggs. In a few days will they get infested again??
Yes, you need to dust 2 or 3 times to ensure that you get all of the live lice, and then the eggs that hatch. I'll dust mine tonight, next week Monday, and next week Thursday.