It must be noted that these are time frames for preventative care. If these pests are present they usually have laid enough eggs to hatch every three days.

When treating a visible problem spray 4 times a week for at least one week.

Useful thing to know, Jerry. I'll bet a lot of problems with pests that "never go away" is from not treating frequently enough.

I think all the problems are rehatching eggs. almost any poison (or "Worm Tea vermi-liquid' I use) will kill pests immediately.

It just looks like it did not work since you are looking at new ones.

Thrips have a 28 day life cycle. Others insects are similarily short. They produce a lot of egss in order to survive as a species. Those eggs are hidden in the medium, under old sheaths, in every every spot they can find protection from your sprays.