I always thought this would be a good idea to stop bugs in their tracks - Although I imagine it would block the wind and make your plants spindly..
If you grab a big bottle, and chop the end off, then slide it over your plant and push the edge of the bottle into the soil to create a shelter. It wont block sun rays but like I said you wont get any wind stimulation whule it's under there so your plant my just fall over when it gets heavier - sadly I have experience in this.. RIP holy grail..
If you do manage to do this, tell me how it goes because i've always wondered..