In my experience, mosquitos and poison ivy are bad, but the very worst itch comes from bites from chiggers (Trombicula alfreddugesi). They're found across the American south and great plains, so the best home remedy is to move to Iceland.

"Home Itch Remedies", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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In my experience, mosquitos and poison ivy are bad, but the very worst itch comes from bites from chiggers (Trombicula alfreddugesi). They're found across the American south and great plains, so the best home remedy is to move to Iceland.