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how long does cedar blocks to fight moths last
Eventually, over time, the fragrance that comes from the cedar wood will become less. The oils and other moth-repelling substances will vaporize. Lightly sanding the wood may help to reactivate the cedar odor--but you would have to have real cedar wood for this to work.
cedar
I'm a little confused by this question. Is the idea to preserve the teddy bear? In that case I would recommend anything with cedar in it. You wouldn't have to get an entire cedar box, but most places that sell closet accessories sell cedar shavings or cedar blocks that you can pack with your bear. This prevents insect infestations like moths.
Yes, rosemary [Rosmarinus officinalis] is effective against insects. The herb or its oil particularly are respected as controls of mosquitoes [Culicidae family]. In that regard, they're as effective as is cedar [Cedrusspp] wood oil against moths [Lepidoptera order].
You can store wool with materials that repel moths. Options include cedar and moth balls.
Cedar closets can provide a nice, pleasant aroma when opening. And also the woods natural properties helps keep out moths as well as absorb moisture and odors.
killing moths
bugs don't like cedar, in old homes the closets are lined with cedar to keep moths from eating holes in there clothing.
Using cedar when constructing a closet can help with keeping out pests such as moths, roaches, and rats. They leave an intoxicating cedar aroma and are found often in older model homes.
Try cedar chips
Patch the holes in your house. Don't leave doors open. Moths are attracted to light at night as well, so don't have a moth-accessable light in your home.