What conditions are necessary for Stachybotrys chartarum to thrive?

Stachybotrys chartarum, commonly known as black mold, thrives under specific environmental conditions that facilitate its growth. The correct choice highlights the importance of high cellulose materials and high water activity for the proliferation of this mold species.

High cellulose materials are essential because Stachybotrys chartarum derives its nutrients from organic materials, particularly those with significant cellulose content, such as wood, paper, and other plant-derived substances. This mold prefers these substrates because they provide the necessary organic carbon sources that are vital for its survival and growth.

Moreover, high water activity is crucial as fungi, including Stachybotrys, require moisture to grow and reproduce. Water activity levels of 0.9 or higher are generally conducive to mold growth, meaning that high humidity or water-saturated materials create an ideal environment for the mold to flourish. This combination facilitates rapid growth and can lead to extensive infestations if not managed.

In contrast, the other options present conditions that do not support the growth of Stachybotrys chartarum. Low moisture levels or insufficient cellulose content would hinder the mold's ability to thrive. Understanding these environmental needs is critical in microbial remediation efforts, allowing for better prevention and control strategies against mold infestations.