Mold and mildew resistant type of sealant. Common diseases include blights, root rot, wilt, powdery mildew, root knot, rust and leaf spot. Neem oil also controls black spot, powdery mildew, anthracnose and rust fungi. Diseases affecting the foliage include rust and smut, downy mildew, and white tip disease. Cultivated species are susceptible to fungal infections including downy and powdery mildew. Siding stain protects against solar radiation especially UV radiation, water, fungus including mildew, and insects. Water can permeate into the wood and cause warping, mildew, or dry rot. Lilac bushes can be prone to powdery mildew disease. It is susceptible to powdery mildew. These fibers are also resistant to moths, mildew and sunlight. Powdery mildew and verticillium wilt can also cause trouble. The salt helps it absorb and retain moisture, and prevents any mildew and algal growth. "Sawadaea tulasnei" is a fungus that causes powdery mildew on tree leaves. "Microsphaera syringae" is a fungus that can cause powdery mildew in lilac. It has good resistance to powdery mildew.