Mildew naturally occurs in which type of ropes?

Mildew is a type of fungus that thrives in warm, damp environments and specifically feeds on organic materials. Natural fiber ropes, which are often made from materials like manila, coir, or cotton, provide an ideal substrate for mildew to grow because they are organic and can absorb moisture.

Unlike synthetic fiber ropes, such as nylon or polypropylene, which are resistant to moisture and do not support fungal growth, natural fiber ropes can retain water and remain damp, thereby creating conditions conducive to mildew formation. Additionally, polyester and high-strength ropes, while sometimes made from synthetic materials that resist moisture and mildew, do not provide the organic material that mildew requires to grow. Thus, natural fiber ropes are the type most likely to develop mildew due to their composition and moisture retention capabilities.