There are some problems with these rabbit collars. The sun rises in the east and sets in the west. These collars will effectively reduce the amount of sunlight my seedlings receive each day. Fortunately, the collars are only temporary, and so the problem of light will not be a problem for long. The other problem is that any determined rabbit could easily put his head over the collar and nibble with little to no effort. My hope is that the rabbit will think the collars are bizzarre and leave my plants alone. It is also possible that the collars will obstruct the rabbit's view of the seedlings. If rabbits find their food by sight, these collars could very well be effective prophylactic measures. We shall see.
These rabbit prophylactics or "collars" are simply plastic pots with their bottoms cut off. Reduce, reuse, recycle. Because I hate plastic, because I don't throw shit away, and because I live in the era of plastic, I have dozens of these plastic pots in my garage, all of them neatly tucked into one another in a manner that befits a hyper-organized, curmudgeonly tight ass. What once was a pot is now a rabbit deterrent. You need only a pair of scissors to make them. By affixing some translucent gauze or similar light emitting material to the top of these collars with a rubber band, the collars could effectively become insect deterrents as well. I am considering doing that. There is a horrible pest called the squash vine borer who lays her eggs on the stems of squash plants, and the larvae bore into the vines and eat them from the inside. It's really gross. For the home gardener, such measures are do-able and worth the effort. For the farmer—fuck it. It's not worth the trouble. Just spray a bunch of gnarly insecticide everywhere and get drunk.