Certain types of Schach have been found to harbor various insects, the Kashrus Bedikas Tolaim said. “As it has been observed, those insects tend to drop from the Schach, and are liable to fall into food below. But with the proper precautions, we can protect ourselves and not cause the mitzvas Sukkah, to be a ‘mitzvah haba’ah be’aveirah’ as the Aruch L’ner cautions.
See the attached pages for instructions on how to rid your Schach of these insects.
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Click here for Yiddish.