Infrastructure means the basic structure of an organization or system. A company's infrastructure would include all the fixed assets, i.e., the building, equipment, machinery and tools required to manufacture their product. Although people are not fixed assets they would be included in the company's infrastructure too.
Rarely a serious problem. Look-alikes: Jumping oak gall, tubakia leaf spot, oak leaf blister, other fungal leaf spots. Jumping oak gall Brown leaves appear on trees in the white oak group in late spring. Severe infections may cause the leaves to turn black, curl up and fall. On the underside are brown galls with the larva of a small wasp inside.
Leaf Scorch. In the case of leaves turning brown, curling up, and falling off, leaf scorch may be the likely culprit. The obvious signs of leaf scorch are yellow and brown-like color changes on the tips and ends of tree leaves. These leaves will eventually curl up, wilt, and drop off. This disorder is also referred to as Leaf Wilt and Leaf Burn.