The tick life cycle is complex. Ticks are not truly insects, but are more closely related to spiders. They are more resistant to our common pesticides and repellents. Typically, one tick is believed to live over a two year period. It starts out as an egg, often laid near the entrance to small rodent (white-footed mouse) dens. It hatches into a tiny larva. Maybe 5-7 larva could fit on the head of a straight pin. These larva typically get on the mouse or nearby rodent, take a blood meal, then fall to the ground to wait to molt into the next stage.
Understanding the flea life cycle helps in planning appropriate environmental controls.
Fleas are living outside in upstate New York during the non-frost, growing season. Typically this period is mid-May to late October, but can vary depending on the weather for that year! Warmer parts of the country may have a year-long flea season, like Florida. Any pet that goes outside is going to attract the fleas while outside and potentially carry them to indoor areas. Clearly, some neighborhoods have heavy local loads (see fleas every year) and others have light local loads (may not see fleas every year). But if you have pets, at sometime you are going to have fleas.
I don’t think my current topical flea/tick product is working - How soon can I reapply?
There is no single answer for this frequently asked question.
The known safe answer is to wait the period of time the product is supposed to work, typically 30 days, before reapplying.