Cercospora. Cercospora is the most common of the many diseases of a sweet gum tree, according to the Florida Department of Agriculture and Consumer Services. Cercospora is a fungal spot disease that produces dark brown, bordered, angular to circular spots 2 to 10 mm in diameter on both sides of leaves.rtist's Conk. Artist's conk (Ganoderma applanatum) is a fungal disease of a sweet gum tree that causes wood rot, according to the University of California IPM Online. Artist's conk infects trees by entering through wounds. White rot occurs in roots and trunks.
Vision and Age Infant Eyes Eye Development. Even in the womb babies can tell the difference between light and dark. And at birth, they see shapes by following the lines where light and dark meet. Yet, they are several weeks old before they can see their first primary color â red.
Initially, they explore with their eyes and ears only. Newborns can focus best at about eight inches from their faces, but this increases over time and they may be able to see objects several feet away by the end of this period. Play objects should fit within their visual field at these distances. They are attracted to bright and vibrant colors, especially yellows and reds, and to objects with high-contrast patterns like black and white spirals. These children prefer the human face to all other patterns, and will watch faces intently.