I don't believe freezing does much to kill any eggs. As soon as the ground thaws from
winter, all the bugs and mosquitoes and ticks come alive.
Freezing will kill some mold spores but not much else.
Only heat at around 180º will take care of that.
Those that have had years of success better get out your drum sticks and bang some
wood. And cross some fingers.
Household pests can enter so many ways. In birdseed, spices, pet food, a bouquet of flowers, or just opening a door.
Last year this time I had fungus gnats and later aphids having never experienced it
before. Jury still out what the original cause was but I took care of it quick and now
know how to monitor it. Either old stock potting mix or my Meyer lemon that spends
the summer outside...who knows.
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