Powdery mildew, soft brown scale, root rot, and viruses may affect plants. Other fungal diseases are black knot, "Alternaria" spot and fruit rot, and powdery mildew. Cuttings are particularly susceptible to rot in moist soil. Symptoms are visible at wound sites where the fungus begins to rot the plant. Its thin skin makes it susceptible to bunch rot and similar fungal diseases. Death of maples can rarely be caused by "Phytophthora" root rot and "Ganoderma" root decay. Coast redwoods are resistant to insect attack, fungal infection, and rot. The fruit is susceptible to brown rot or a dark reddish spot. Everything must succumb to death and rot. Seeds sown too early will rot before germination. The fruits are subject to damage from gray mold, rhizopus rot, and leather rot. Dry rot is a generic name for certain species of brown-rot fungi. This property can prevent root rot and moderate drought cycles. Wood used for water pipes also does not rot very easily. It needs good drainage or it will rot.