What Is Yellow Mold?


Mold is a variety of fungus that grows in nature and eats organic matter. As a natural part of the cycle of life, most types of mold are harmless when you come across them in nature. When the mold begins to grow in your home, however, it can cause serious health issues and can eventually decay walls, carpet and fabrics. Mold can also grow in your garden and can kill your plants. Hundreds of thousands types of mold exist, some of which appear yellow.

Slime Mold

  • Slime mold is a type of mold that has a wide range of color. The mold will appear slimy rather than powdery. Slime mold commonly grows in lawns and on small plants. It is also common on very damp mulch and decaying wood. It appears most often in the summer when the climate is warm enough for it to thrive. If you let it grow out of control, the yellow slime mold could spread to over 2 feet in diameter. Prevent it by not over-watering your plants and by spacing them further apart so that they can air out properly.

Fusarium Patch

  • A type of fungus that grows in patches as soon as snow melts is fusarium patch. It will continue to grow as long as the weather remains cool and the grass remains wet. This mold kills Kentucky Bluegrass. The mold tends to grow if the winter began early and snow came before the ground had a chance to freeze. You can kill the mold by applying a fungicide.


  • Aspergillus is a type of mold that commonly grows in homes. It can appear gray, black, white, brown or yellow. It might have an entire range of colors. Aspergillus can cause an allergic reaction for those who are exposed to it for a longer period, or it can cause more serious health issues such as infections. Aspergillus tends to grow on walls, insulation, carpet and on paper products.

Preventing Mold

  • Prevent mold from growing by lowering the relative humidity in your home. The fastest way to do this is to install a dehumidifier that will remove excess moisture from the air. Choose one that is large enough for your entire home, or use several small ones for each level of your house. Lower humidity by using ventilation fans and by opening windows and doors to air out laundry rooms and bathrooms.

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