Cultivated species are susceptible to fungal infections including downy and powdery mildew. Smaller birds include the downy and hairy woodpeckers. Growth is rapid and colonies appear downy or powdery in texture. Cucurbit downy mildew only affects leaves of cucurbit plants. Their stems are covered in downy hairs. They are low-growing deciduous shrubs growing to tall with downy twigs. The winter coat consists of long, coarse bristles underlaid with short brown downy fur. The chicks are precocial at hatching, covered in downy cryptic feathers. It is virtually identical in plumage to the smaller downy woodpecker. The chicks hatch with a covering of downy feathers. Fungicides applied specifically for downy mildew control may be unnecessary. "Peronospora" has far more species than any other genus of the downy mildews. "Plasmopara viticola" is the causal agent of grapevine downy mildew. They will place a tiny pea beneath twenty thick downy mattresses. Chicks hatch synchronously with a dense downy coat.