Which is a common cause of deterioration in natural fiber ropes?

Mildew is a common cause of deterioration in natural fiber ropes due to the organic material they are composed of, which provides an ideal environment for mold and mildew to grow. When natural fibers are exposed to moisture, especially in warm and humid conditions, mildew can develop, leading to weakening of the rope's structure. This degradation may manifest as brittleness, softness, or discoloration, greatly reducing the rope's strength and reliability. Proper care and storage conditions are essential to prevent mildew, including keeping the ropes dry, clean, and well-ventilated.

Other factors such as low humidity storage or infrequent use do not actively contribute to deterioration in the same way mildew does. Even though storage in specific environments can affect rope longevity, it is not as direct or immediate a risk as mildew growth. Additionally, using a rope bag provides protection against UV rays and physical damage, thus not contributing to decay but possibly aiding in preservation.