Can you put DE (till it in) on my bed where I saw the squash bugs before? I mean can I pull up my squash, till DE into the empty bed and leave it to over winter as a control?
I don’t really know about DE that way. I don’t think it works as effectively if it gets wet. You might get some and one of the little ‘huffer’ thingies to spritz your zukes/cukes next year though. That’s what we use.
No. DE is made of limestone from the shells of fossilized plankton. It dissolves on contact with moisture unfortunately. Takes a couple of days to kill bugs so I try to check the forecast for rain before applying.